What are Flat Belt Pulleys and how are they used in machinery?

Flat Belt Pulleys are mechanical drive components designed to transmit motion and power between rotating shafts using flat belts. They are commonly used in applications that require smooth and efficient power transmission, such as in conveyors, HVAC systems, packaging machinery, and other industrial automation setups.

What key factors should be considered when selecting a Flat Belt Pulley?

Important selection criteria include outer diameter (D), nominal width (T), length (L), shaft compatibility (round bore or bearing type), and material (steel, aluminum, stainless steel, or plastic). The operating conditions—like load, speed, temperature, and environment—also significantly impact the ideal choice.

How does pulley shape affect performance in a flat belt system?

The shape—such as straight, crowned, or grooved—determines how the belt tracks. Crowned pulleys self-center the belt to reduce slippage, straight pulleys offer precise alignment for tightly controlled setups, and grooved designs can provide better traction in specialized applications.

What role does a flange play on a Flat Belt Pulley?

A flange helps to keep the belt aligned on the pulley and prevents it from slipping off during operation. Flanged pulleys are ideal in applications where lateral belt movement must be minimized for consistent and safe operation.

What materials are commonly used for Flat Belt Pulleys and why?

Steel: High strength and durability for demanding loads Aluminum: Lightweight and corrosion-resistant, ideal for mid-load systems Stainless Steel: Excellent corrosion resistance, suitable for harsh or clean environments Plastic: Low weight, quieter operation, and cost-effective for light-duty use

How do I determine the right pulley diameter for my system?

The ideal pulley diameter depends on the required speed and torque. Larger diameters increase belt speed but lower torque, while smaller diameters increase torque but reduce speed. Matching pulley size to your machine's performance specifications ensures efficient power delivery.

What advantages do idlers provide in flat belt systems?

Idler pulleys, especially those with built-in bearings, help maintain proper belt tension, guide the belt’s path, and reduce vibrations and wear. They're essential for systems with long belt paths or direction changes.

Can Flat Belt Pulleys be customized for unique applications?

Yes, many manufacturers offer customizations including material selection, surface treatment (e.g., anodizing, plating), and custom bore dimensions. Custom pulleys improve performance, fit, and longevity for specific use cases.

What is the effect of surface treatment on Flat Belt Pulley performance?

Treatments like black oxide, nickel plating, or anodizing enhance corrosion resistance, reduce friction, and improve durability. These are particularly useful in high-humidity or chemically exposed environments.

How do I select the right bore diameter for a Flat Belt Pulley?

The bore diameter must match the shaft size. Account for tolerances and any keyways needed for secure mounting. It should fit snugly—tight enough to prevent slipping but not so tight that it hampers installation or expansion due to heat.

What configuration options are available in terms of pulley length?

Flat Belt Pulleys come in a range of lengths (e.g., short: ~50 mm, medium: ~100 mm, long: ~300 mm) to suit various belt widths and machine layouts. The length selected depends on belt travel and space constraints.

Why is pulley width important in flat belt systems?

The pulley width must correspond to the belt width. A mismatch can cause slippage or uneven tracking, leading to reduced efficiency and potential damage. Proper width ensures stable operation and even belt wear.

What are common issues with Flat Belt Pulleys and how can they be avoided?

Typical problems include belt slippage, misalignment, and excessive wear. These can be prevented with correct sizing, shape selection, regular maintenance, and using pulleys suited to the environmental conditions (e.g., corrosion-resistant coatings).

How does material choice affect pulley weight and system performance?

Material directly influences weight—aluminum and plastic pulleys are lighter, which reduces system load and bearing wear. Steel and stainless steel offer strength but add weight, which may be a concern in high-speed or mobile systems.

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Flat Belt Pulleys（Length L：~50）

Flat Belt Pulleys products in the Automation Components category. Specified by Length L ~50. There are around 19 items of Flat Belt Pulleys products available and the specifications can easily be compared. Search and select detailed specifications of parts for your machine with free CAD downloads. Flat Belt Pulleys offers a wide selection of products, on time delivery, free shipping and no minimum order quantity with a consulting team available.

Types of Flat Belt Pulleys

Flat belt pulleys are designed to transmit motion and power between shafts via flat belts, widely used in mechanical drives and conveying systems. These pulleys are offered in multiple shapes and structural variations to match specific performance requirements.

Shape Variants

Flat Belt Pulleys – Straight: These have a flat, parallel surface ideal for standard flat belt applications, offering smooth and stable motion.
Flat Belt Pulleys – Crowned: Crowned pulleys feature a slight convex surface that helps center the belt automatically, preventing slipping and improving belt alignment.
Flat Belt Pulleys – V-Groove: Designed for applications needing additional grip, these pulleys combine flat belt function with V-groove positioning, often used in hybrid or custom systems.

Pulley Types

Standard Pulleys: Used in power transmission systems to transfer rotary motion efficiently from one shaft to another.
Idlers (Bearing Built-in): These pulleys come with built-in bearings and are typically used to guide or support belts without transferring torque. They help maintain belt tension and alignment.

Material Options

The choice of pulley material plays a crucial role in performance, durability, and application compatibility.

Steel: Offers high strength and durability, suitable for heavy-duty industrial applications where high torque transmission is required.
Aluminum: Lightweight and corrosion-resistant, aluminum pulleys are ideal for high-speed applications and reduce the overall weight of machinery.
Stainless Steel: Known for its corrosion resistance and strength, stainless steel pulleys are ideal for cleanroom or harsh environment applications such as food processing or chemical equipment.
Plastic: Lightweight and cost-effective, plastic pulleys are suitable for low-load and low-speed environments or where noise reduction is important.

Key Features and Applications

Flat belt pulleys are designed to provide efficient power transmission while minimizing wear and noise. Here are a few notable benefits and applications:

Precision Performance: Ideal for precise, smooth, and continuous belt-driven motion.
Wide Compatibility: Used in conveyors, machine tools, printing presses, and packaging equipment.
Environment-Specific Variants: Pulleys are available in environmentally friendly designs and offer compatibility with moisture-sensitive or cleanroom environments.
With or Without Flanges: Select flange types based on whether belt retention is needed.

Customization and Configuration

MISUMI and other featured brands offer flat belt pulleys in various diameters and face widths, with options for bore type, surface finish, and shaft mounting. Use the online configurator and CAD tools to select and tailor parts based on exact machine specifications.

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Brand	(9) (1) IMAO CORPORATION (4) KONISHI (0) NABEYA BI-TECH (6)
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Idlers for Flat Belts-Flanged Type/Crowned Type/Width L6-32

Idlers for Flat Belts-Flanged Type/Crowned Type/Width L6-32

MISUMI

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· Idlers type: Bearing Built-in.
· Shaft Type: one Bearing and Bearing on Each End 2 pcs.
· Type of Idlers: Flanged type and Crowned type.
· The series code of Flanged type: HBG HBGM HBGA HBGS and HBGP.
· The series code of Crowned type: HBGC HBGCM HBGCA and HBGCS.
· Material Idlers body: S45C Equivalent, Aluminum Alloy, Stainless Steel SUS304 and Polyacetal.
· Material of Bearing: Steel and Stainless Steel.
· Outer Diameter: 15 – 50 mm
· Width Thickness: 6 – 32 mm
· Idlers for Stainless Steel Belts: Crowned

Volume Discount

CAD ：: 2D / 3D

Shape	With or w/o Flange	Outer Dia. D(Ø)	Nominal Width T(mm)	Length L(mm)	Flange Shape	Type	Material	Shaft Type	Surface Urethane	Shaft (Bore) Dia. d(mm)	Surface Treatment	Shaft End Specification
Straight / Crowned	Flange / No Flange	15 ～ 50	6 ～ 32	~50	-	Idlers (Bearing Built-in)	Steel / Aluminum / Stainless Steel / Plastic	1-Bearing / 1-Bearing on Each End (2-Bearing in Total)	Urethane Not Provided	4 ～ 12	Not Provided / Black Oxide / Electroless Nickel Plating / Clear Anodize	-

From: ₹ 1,100.62
Special Price
Days to Ship: Same day or more

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Idler Flat Belt Driven Roller (RABS)

IMAO CORPORATION

New at MISUMI? Get 20% Discount on your First Purchase. Click to Register Now

[Teachers]
· Usable as a following roller for flat belts.
· As the flange height is even lower than the belt thickness, transport work to the top of the roller is possible.
· Ball bearings are fixed with retainer rings

CAD ：: 2D / 3D

Shape	With or w/o Flange	Outer Dia. D(Ø)	Nominal Width T(mm)	Length L(mm)	Flange Shape	Type	Material	Shaft Type	Surface Urethane	Shaft (Bore) Dia. d(mm)	Surface Treatment	Shaft End Specification
Straight	No Flange	30 ～ 60	11 ～ 41	~50	Standard	Idlers (Bearing Built-in)	Steel	1-Bearing / 2-Bearing at Center	Urethane Not Provided	8 ～ 12	Electroless Nickel Plating	-

From: ₹ 1,930.00
Days to Ship: 5 Day(s) or more

5 Day(s) or more

Economy series

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MiSUMi Economy

Flat Belts Pulleys Width 6 - 32

MiSUMi Economy

MISUMI

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Shape	With or w/o Flange	Outer Dia. D(Ø)	Nominal Width T(mm)	Length L(mm)	Flange Shape	Type	Material	Shaft Type	Surface Urethane	Shaft (Bore) Dia. d(mm)	Surface Treatment	Shaft End Specification
Straight / Crowned	Flange / No Flange	15 ～ 100	6 ～ 32	~50	Standard	Pulleys	Steel / Aluminum / Stainless Steel	Round Hole	Urethane Provided / Urethane Not Provided	5 ～ 40	Not Provided / Black Oxide / Electroless Nickel Plating / Clear Anodize	-

Days to Ship: 9 Day(s) or more

9 Day(s) or more

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Pulley Idler With Flange (FIP, FIPA, FIPS, FIP-SUS)

IMAO CORPORATION

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Pulley idler with flange usable for flat belts and timing belts. Available in plastic, aluminum, steel, and SUS.

CAD ：: 2D / 3D

Shape	With or w/o Flange	Outer Dia. D(Ø)	Nominal Width T(mm)	Length L(mm)	Flange Shape	Type	Material	Shaft Type	Surface Urethane	Shaft (Bore) Dia. d(mm)	Surface Treatment	Shaft End Specification
Straight	No Flange	25 ～ 75	7.5 ～ 44	~50	Standard	Idlers (Bearing Built-in)	Steel / Plastic	1-Bearing / 2-Bearing at Center	Urethane Not Provided	6 ～ 15	Not Provided / Electroless Nickel Plating	-

From: ₹ 847.00
Days to Ship: 5 Day(s) or more

5 Day(s) or more

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Idlers for Flat Belts-Straight Type/Crosspiece Groove Straight Type/Crowned Type/Width L25-100

MISUMI

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· Product type: Idlers.
· Idlers type: Bearing Built-in.
· Shape of Idlers: Straight type, Crosspiece Groove Straight Type and Crowned Type.
· Shaft Type : Bearing on Each End (2-Bearing in Total)
· The product code series Straight type: ROFAN and ROFAF.
· The product code series Crosspiece Groove Straight: ROFAM.
· The product code series Crowned Type: ROFAC.
· Idlers Material: Aluminum Alloy
· Surface Treatment solution: Clear Anodize
· Outer Diameter: 15-80 mm.
· Shaft (Bore) Diameter: 5-35 mm.
· Length: 25-100 mm.
· Pulleys for Flat Belts - Flanged, Crowned, Press-Fit Urethane

CAD ：: 2D / 3D

Shape	With or w/o Flange	Outer Dia. D(Ø)	Nominal Width T(mm)	Length L(mm)	Flange Shape	Type	Material	Shaft Type	Surface Urethane	Shaft (Bore) Dia. d(mm)	Surface Treatment	Shaft End Specification
Straight / Crowned / V-Groove	Flange / No Flange	15 ～ 80	-	~50	-	Idlers (Bearing Built-in)	Aluminum	1-Bearing on Each End (2-Bearing in Total)	Urethane Not Provided	5 ～ 35	Clear Anodize	-

Days to Ship: 10 Day(s) or more

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Pulleys for Flat Belts (Width L=25 ~ 100) - Crowned, Crosspiece Groove Straight

MISUMI

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· The Pulleys for Flat Belts ROBAC, ROBACF, and ROBAM types are specific pulleys manufactured by MISUMI.
· Shaft of Pulleys : Crowned and Crosspiece Groove Straight type.
· The series code of Crowned type: ROBAC, ROBACF.
· The series code of Crosspiece Groove type: ROBAM.
· Shaft Type : Round Hole.
· Pulleys Body Material: Aluminum Alloy.
· Surface Treatment solution: Clear Anodize
· Outer Diameter: 15-80 mm.
· Shaft (Bore) Diameter: 8-35 mm.
· Length: 25-100 mm.
· Idlers for Flat Belts (Width L25-100) -Straight Type/Crosspiece Groove Straight Type/Crowned Type

CAD ：: 2D / 3D

Shape	With or w/o Flange	Outer Dia. D(Ø)	Nominal Width T(mm)	Length L(mm)	Flange Shape	Type	Material	Shaft Type	Surface Urethane	Shaft (Bore) Dia. d(mm)	Surface Treatment	Shaft End Specification
Crowned / V-Groove	Flange / No Flange	15 ～ 80	-	~50	-	Pulleys	Aluminum	Round Hole	Urethane Not Provided	8 ～ 35	Clear Anodize	Tap / Keyway + Tap

Days to Ship: 15 Day(s) or more

15 Day(s) or more

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Pulleys for Flat Belts (Width T=6 ~ 32) - Flanged, Crowned, Press-Fit Urethane

MISUMI

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· Shaft of Pulleys: Flanged, Crowned, Press-Fit Urethane
· The series code of Flanged type: HBPG, HBPM, HBPA and HBPS.
· The series code of Crowned type: HBPCG, HBPCM, HBPCA and HBPCS.
· The series code of Press-Fit Urethane type: HBPUS.
· Shaft Type : Round Hole.
· Pulleys Body Material: S45C Equivalent, Aluminum Alloy and SUS304.
· Surface Treatment solution: Black Oxide, Electroless Nickel Plating, Clear Anodize and Urethane Shore A70.
· Outer Diameter: 15-100 mm.
· Shaft (Bore) Diameter: 5-40 mm.
· Width Thickness: 6-32 mm.
· VFF Engineering Plastic Flanged Idler

CAD ：: 2D / 3D

Shape	With or w/o Flange	Outer Dia. D(Ø)	Nominal Width T(mm)	Length L(mm)	Flange Shape	Type	Material	Shaft Type	Surface Urethane	Shaft (Bore) Dia. d(mm)	Surface Treatment	Shaft End Specification
Straight / Crowned	Flange / No Flange	15 ～ 100	6 ～ 32	~50	Standard	Pulleys	Steel / Aluminum / Stainless Steel	Round Hole	Urethane Provided / Urethane Not Provided	-	Not Provided / Black Oxide / Electroless Nickel Plating / Clear Anodize	-

Days to Ship: 13 Day(s) or more

13 Day(s) or more

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VFJ Flanged Idler With Axis

NABEYA BI-TECH

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● Comes with nut and spring washer.
● Material/Finish
· Body: Glass fiber-reinforced Nylon 66
Bearings: steel, rubber seal
· Nut / spring / washer: steel with trivalent chromate treatment
· Bolt: steel
· Collar: steel, black oxide coating (black)

Shape	With or w/o Flange	Outer Dia. D(Ø)	Nominal Width T(mm)	Length L(mm)	Flange Shape	Type	Material	Shaft Type	Surface Urethane	Shaft (Bore) Dia. d(mm)	Surface Treatment	Shaft End Specification
Straight	Flange	45 ～ 50	20 ～ 30	~50	Standard	Idlers (Bearing Built-in)	Plastic	1-Bearing / 2-Bearing at Center / With Shaft	Urethane Not Provided	-	Not Provided	-

From: ₹ 1,517.49
Days to Ship: 5 Day(s) or more

5 Day(s) or more

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VFJA Flanged Idler With Axis

NABEYA BI-TECH

[Features]
· Flat idler that can even handle heavy loads.
· Recommended for use as a set with YSB.
· Nut and washer included

CAD ：: 2D / 3D

Shape	With or w/o Flange	Outer Dia. D(Ø)	Nominal Width T(mm)	Length L(mm)	Flange Shape	Type	Material	Shaft Type	Surface Urethane	Shaft (Bore) Dia. d(mm)	Surface Treatment	Shaft End Specification
Straight	No Flange	30 ～ 40	-	~50	-	Idlers (Bearing Built-in)	Aluminum	Round Hole / 1-Bearing on Each End (2-Bearing in Total) / With Shaft	Urethane Not Provided	-	Clear Anodize	-

From: ₹ 3,638.38
Days to Ship: 5 Day(s) or more

5 Day(s) or more

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VFF Engineering Plastic Flanged Idler

NABEYA BI-TECH

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· Model: VFF
· Idlers type: One piece bearing and Double bearing Built-in.
· Material Idlers body: Glass fiber-reinforced Nylon 66
· Idlers Shape : Straight type.
· Material Bearings: steel, rubber seal.
· Outer Diameter: 40, 45, 50, 60, 65, 70 and 75 mm.
· Nominal width Diameter: 15, 20, 25, 30, 45, 50 and 65 mm.
· Shaft (Bore) Diameter: 10, 12, 15, 17 and 20 mm.
· L dimension: 50 -100 mm.
· VFF Engineering Plastic Flanged Idler VFF types is specific idlers manufactured by NBK.
· VFL Engineering Plastic Flat Idler

Shape	With or w/o Flange	Outer Dia. D(Ø)	Nominal Width T(mm)	Length L(mm)	Flange Shape	Type	Material	Shaft Type	Surface Urethane	Shaft (Bore) Dia. d(mm)	Surface Treatment	Shaft End Specification
Straight	Flange	40 ～ 75	15 ～ 34.5	~50	Standard	Idlers (Bearing Built-in)	Plastic	1-Bearing / 2-Bearing at Center	Urethane Not Provided	10 ～ 20	Not Provided	Not Provided

From: ₹ 808.38
Days to Ship: 5 Day(s) or more

5 Day(s) or more

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Idlers for Stainless Steel Belts-Crowned

MISUMI

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· Idlers type: Bearing Built-in.
· Type of Idlers: Crowned type.
· Shaft Type : Round Hole.
· The product code series: ROFASC
· Material Idlers body: Aluminum Alloy.
· Surface Treatment solution: Hard Anodize Treatment (Film Hardness 300HV)
· Outer Diameter: 50, 60, 70, 75, 80 and 100 mm.
· Shaft (Bore) Diameter: 10, 12, 15, 20, 25, 30, 35 and 40 mm.
· Length: 40 to 160 mm.
· Idlers for stainless steel belts are conveyor rollers designed to work specifically with stainless steel belts, providing smooth and reliable movement.
· Idlers for Flat Belts-Width L38-90

CAD ：: 2D / 3D

Shape	With or w/o Flange	Outer Dia. D(Ø)	Nominal Width T(mm)	Length L(mm)	Flange Shape	Type	Material	Shaft Type	Surface Urethane	Shaft (Bore) Dia. d(mm)	Surface Treatment	Shaft End Specification
Crowned	No Flange	50 ～ 100	-	~50	-	Idlers (Bearing Built-in)	Aluminum	Round Hole	Urethane Not Provided	10 ～ 40	Hard Clear Anodize	-

Days to Ship: 10 Day(s) or more

10 Day(s) or more

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Stainless steel flat idler_VFLS

NABEYA BI-TECH

[Features]
· All stainless steel.
· Use in combination with standard either shaft ZS (stainless steel).
· Products also manufactured to custom order.
· Contact MISUMI for more information.
· Material and finishing: Main body SUS303

CAD ：: 2D / 3D

Shape	With or w/o Flange	Outer Dia. D(Ø)	Nominal Width T(mm)	Length L(mm)	Flange Shape	Type	Material	Shaft Type	Surface Urethane	Shaft (Bore) Dia. d(mm)	Surface Treatment	Shaft End Specification
Straight	No Flange	30 ～ 50	-	~50	-	Idlers (Bearing Built-in)	Stainless Steel	Round Hole / 1-Bearing	Urethane Not Provided	10 ～ 12	Not Provided	Not Provided

From: ₹ 6,651.13
Days to Ship: 8 Day(s) or more

8 Day(s) or more

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Idlers for Flat Belts-Width L38-90

MISUMI

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· Idlers type: Bearing Built-in.
· Shape of Idlers: Straight type.
· Shaft Type : Bearing on Each End (2-Bearing in Total)
· The product code series: ROFA, ROFB, ROFM and ROFS.
· Material Idlers body: S45C Equivalent, Aluminum Alloy and Stainless Steel SUS304.
· Surface Treatment solution: Black Oxide, Electroless Nickel Plating and Clear Anodize.
· Material of Bearing: Steel and Stainless Steel.
· Outer Diameter: 20, 25, 30, 35 and 40 mm.
· Shaft (Bore) Diameter: 6, 8 and 10 mm.
· Length: 38, 45, 50, 60, 70, 85 and 90 mm.
· Pulleys for Stainless Steel Belts-Crowned

Volume Discount

CAD ：: 2D / 3D

Shape	With or w/o Flange	Outer Dia. D(Ø)	Nominal Width T(mm)	Length L(mm)	Flange Shape	Type	Material	Shaft Type	Surface Urethane	Shaft (Bore) Dia. d(mm)	Surface Treatment	Shaft End Specification
Straight	No Flange	20 ～ 40	-	~50	-	Idlers (Bearing Built-in)	Steel / Aluminum / Stainless Steel	1-Bearing on Each End (2-Bearing in Total)	Urethane Not Provided	6 ～ 10	Not Provided / Black Oxide / Electroless Nickel Plating / Clear Anodize	-

From: ₹ 1,620.74
Days to Ship: 8 Day(s) or more

8 Day(s) or more

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Pulleys for Flat Belts with Urethane (Width L=25 ~ 100) - Crowned, Crosspiece Groove Straight

MISUMI

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· Product type : Pulleys.
· Shaft of Pulleys : Crowned and Crosspiece Groove Straight type.
· The series code of Crowned type: RWCUN RWCUF RWMUN and RWMUF.
· The series code of Crosspiece Groove type: RWCGN RWCGF RWMGN and RWMGF.
· Shaft Type : Round Hole.
· Flange: Flange type and No Flange.
· Core Material: Aluminium A5052.
· Lining Material: Urethane (Natural Color)
· Urethane Hardness: Shore A90 and Shore A70.
· Outer Diameter: 15-80 mm.
· Shaft (Bore) Diameter: 8-35 mm.
· Length: 25-100 mm.
· Economy Pulleys for Flat Belts-Crowned Type/Crosspiece Groove Straight Type/Width L110-510

CAD ：: 2D / 3D

Shape	With or w/o Flange	Outer Dia. D(Ø)	Nominal Width T(mm)	Length L(mm)	Flange Shape	Type	Material	Shaft Type	Surface Urethane	Shaft (Bore) Dia. d(mm)	Surface Treatment	Shaft End Specification
Crowned / V-Groove	Flange / No Flange	15 ～ 80	-	~50	-	Pulleys	Aluminum	Round Hole	Urethane Provided	8 ～ 35	Not Provided	Tap

Days to Ship: 10 Day(s) or more

10 Day(s) or more

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Pulley Idler (NIP, NIPA, NIPS, NIP-SUS)

IMAO CORPORATION

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· Pulley idler to be used for flat belts and timing belts.
· NIP material is Glass-fiber reinforced polyamide plastic the color is Black.
· NIPA material is A5052 Anodized finish and color is Natural.
· NIPS material is Steel (S45C) Electroless nickel plated finish.
· NIP-SUS material is SUS303.
· Bearing material: steel and stainless steel.
· Retaining Ring material: steel and stainless steel.
· The important to note that the specific material used for pulley idlers can vary depending on the application requirements, industry standards, and manufacturer specifications.
· Idler Crown Roller (CTR, CTRS)

CAD ：: 2D / 3D

Shape	With or w/o Flange	Outer Dia. D(Ø)	Nominal Width T(mm)	Length L(mm)	Flange Shape	Type	Material	Shaft Type	Surface Urethane	Shaft (Bore) Dia. d(mm)	Surface Treatment	Shaft End Specification
Straight	No Flange	24 ～ 73	12 ～ 49	~50	-	Idlers (Bearing Built-in)	Steel / Plastic	1-Bearing / 2-Bearing at Center	Urethane Not Provided	6 ～ 15	Not Provided / Electroless Nickel Plating	-

From: ₹ 1,195.00
Days to Ship: 5 Day(s) or more

5 Day(s) or more

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Idler Crown Roller (CTR, CTRS)

IMAO CORPORATION

· Idlers type: One piece bearing and Double bearing Built-in.
· Shape of Idlers: Crowned type.
· CTR: material is Glass-fiber reinforced CTR polyamide plastic color black.
· CTRS: material is Steel S45C and Steel Electroless nickel plated finish.
· Idler body material is steel and Resin.
· Bearing material: steel.
· Retaining Ring material: steel.
· Outer Diameter: 34, 43 and 48 mm.
· Thickness Diameter: 20, 25, 35 and 49 mm.
· The crown design helps keep the belt centered, preventing slipping and tracking issues.
· Pulley for Flat Belts- Crowned Type/Crosspiece Groove Straight.

CAD ：: 2D / 3D

Shape	With or w/o Flange	Outer Dia. D(Ø)	Nominal Width T(mm)	Length L(mm)	Flange Shape	Type	Material	Shaft Type	Surface Urethane	Shaft (Bore) Dia. d(mm)	Surface Treatment	Shaft End Specification
Crowned	No Flange	34 ～ 73	20 ～ 49	~50	-	Idlers (Bearing Built-in)	Steel / Plastic	1-Bearing / 2-Bearing at Center	Urethane Not Provided	10 ～ 15	Not Provided / Electroless Nickel Plating	-

From: ₹ 1,409.00
Days to Ship: 5 Day(s) or more

5 Day(s) or more

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Pulleys for Stainless Steel Belts-Crowned

MISUMI

· Product type : Pulleys.
· Shaft of Pulleys : Crowned type.
· Shaft Type : Round Hole.
· The product code series: ROBASC
· Material of Pulleys: Aluminum Alloy.
· Surface Treatment solution: Hard Anodize Treatment (Film Hardness 300HV)
· Outer Diameter: 50, 60, 70, 75, 80 and 100 mm.
· Shaft (Bore) Diameter: 15, 20, 25, 30, 35 and 40 mm.
· Length: 40 to 160 mm.
· Shaft Hole Specifications: Round Hole + Tap and New JIS Keyway + Tap
· Pulleys for Flat Belts with Urethane - Crowned, Crosspiece Groove Straight

CAD ：: 2D / 3D

Shape	With or w/o Flange	Outer Dia. D(Ø)	Nominal Width T(mm)	Length L(mm)	Flange Shape	Type	Material	Shaft Type	Surface Urethane	Shaft (Bore) Dia. d(mm)	Surface Treatment	Shaft End Specification
Crowned	No Flange	50 ～ 100	-	~50	-	Pulleys	Aluminum	Round Hole	Urethane Not Provided	15 ～ 40	Hard Clear Anodize	Tap / Keyway + Tap

Days to Ship: 15 Day(s) or more

15 Day(s) or more

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Aluminum flat idler_VFLA

NABEYA BI-TECH

[Features]
· Main body is aluminum alloy, bearing is steel.
· High precision and lightweight.
· Products also manufactured to custom order.
· Contact MISUMI for more information.
· Main body and finishing: A5052, anodized.

CAD ：: 2D / 3D

Shape	With or w/o Flange	Outer Dia. D(Ø)	Nominal Width T(mm)	Length L(mm)	Flange Shape	Type	Material	Shaft Type	Surface Urethane	Shaft (Bore) Dia. d(mm)	Surface Treatment	Shaft End Specification
Straight	No Flange	40 ～ 50	-	~50	-	Idlers (Bearing Built-in)	Aluminum	Round Hole / 1-Bearing	Urethane Not Provided	10 ～ 12	Clear Anodize	Not Provided

From: ₹ 2,826.93
Days to Ship: 5 Day(s) or more

5 Day(s) or more

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VFL Engineering Plastic Flat Idler

NABEYA BI-TECH

· Model: VFL
· Idlers type: One piece bearing and Double bearing Built-in.
· Material Idlers body: Glass fiber-reinforced Nylon 66
· idlers Shape : Straight type.
· Material Bearings: steel, rubber seal.
· Outer Diameter: 50 and 70 mm.
· Nominal width Diameter: 30 and 55 mm.
· Shaft hole Diameter: 12 and 15 mm.
· L dimension: 50 -100 mm.
· Material: Nylon 66, also known as polyamide 66, is a type of engineering plastic known for its high strength, toughness, and wear resistance.
· Economy Pulleys for Flat Belts with Urethane-Crowned/Crosspiece Groove Straight

Shape	With or w/o Flange	Outer Dia. D(Ø)	Nominal Width T(mm)	Length L(mm)	Flange Shape	Type	Material	Shaft Type	Surface Urethane	Shaft (Bore) Dia. d(mm)	Surface Treatment	Shaft End Specification
Straight	No Flange	50	-	~50	-	Idlers (Bearing Built-in)	Plastic	1-Bearing	Urethane Not Provided	12	Not Provided	Not Provided

From: ₹ 957.16
Days to Ship: 7 Day(s) or more

7 Day(s) or more


Brand
Product Series
CAD
From
Days to Ship
Shape
With or w/o Flange
Outer Dia. D(Ø)
Nominal Width T(mm)
Length L(mm)
Flange Shape
Type
Material
Shaft Type
Surface Urethane
Shaft (Bore) Dia. d(mm)
Surface Treatment
Shaft End Specification

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Brand	MISUMI	IMAO CORPORATION	MISUMI MiSUMi Economy	IMAO CORPORATION	MISUMI	MISUMI	MISUMI	NABEYA BI-TECH	NABEYA BI-TECH	NABEYA BI-TECH	MISUMI	NABEYA BI-TECH	MISUMI	MISUMI	IMAO CORPORATION	IMAO CORPORATION	MISUMI	NABEYA BI-TECH	NABEYA BI-TECH
Product Series	Idlers for Flat Belts-Flanged Type/Crowned Type/Width L6-32	Idler Flat Belt Driven Roller (RABS)	Flat Belts Pulleys Width 6 - 32	Pulley Idler With Flange (FIP, FIPA, FIPS, FIP-SUS)	Idlers for Flat Belts-Straight Type/Crosspiece Groove Straight Type/Crowned Type/Width L25-100	Pulleys for Flat Belts (Width L=25 ~ 100) - Crowned, Crosspiece Groove Straight	Pulleys for Flat Belts (Width T=6 ~ 32) - Flanged, Crowned, Press-Fit Urethane	VFJ Flanged Idler With Axis	VFJA Flanged Idler With Axis	VFF Engineering Plastic Flanged Idler	Idlers for Stainless Steel Belts-Crowned	Stainless steel flat idler_VFLS	Idlers for Flat Belts-Width L38-90	Pulleys for Flat Belts with Urethane (Width L=25 ~ 100) - Crowned, Crosspiece Groove Straight	Pulley Idler (NIP, NIPA, NIPS, NIP-SUS)	Idler Crown Roller (CTR, CTRS)	Pulleys for Stainless Steel Belts-Crowned	Aluminum flat idler_VFLA	VFL Engineering Plastic Flat Idler
CAD	2D / 3D	2D / 3D		2D / 3D	2D / 3D	2D / 3D	2D / 3D		2D / 3D		2D / 3D	2D / 3D	2D / 3D	2D / 3D	2D / 3D	2D / 3D	2D / 3D	2D / 3D
From	₹ 1,100.62 Special Price On Sale Till 31/03/2026	₹ 1,930.00		₹ 847.00				₹ 1,517.49	₹ 3,638.38	₹ 808.38		₹ 6,651.13	₹ 1,620.74		₹ 1,195.00	₹ 1,409.00		₹ 2,826.93	₹ 957.16
Days to Ship	Same day or more	5 Day(s) or more	9 Day(s) or more	5 Day(s) or more	10 Day(s) or more	15 Day(s) or more	13 Day(s) or more	5 Day(s) or more	5 Day(s) or more	5 Day(s) or more	10 Day(s) or more	8 Day(s) or more	8 Day(s) or more	10 Day(s) or more	5 Day(s) or more	5 Day(s) or more	15 Day(s) or more	5 Day(s) or more	7 Day(s) or more
Shape	Straight / Crowned	Straight	Straight / Crowned	Straight	Straight / Crowned / V-Groove	Crowned / V-Groove	Straight / Crowned	Straight	Straight	Straight	Crowned	Straight	Straight	Crowned / V-Groove	Straight	Crowned	Crowned	Straight	Straight
With or w/o Flange	Flange / No Flange	No Flange	Flange / No Flange	No Flange	Flange / No Flange	Flange / No Flange	Flange / No Flange	Flange	No Flange	Flange	No Flange	No Flange	No Flange	Flange / No Flange	No Flange	No Flange	No Flange	No Flange	No Flange
Outer Dia. D(Ø)	15 ～ 50	30 ～ 60	15 ～ 100	25 ～ 75	15 ～ 80	15 ～ 80	15 ～ 100	45 ～ 50	30 ～ 40	40 ～ 75	50 ～ 100	30 ～ 50	20 ～ 40	15 ～ 80	24 ～ 73	34 ～ 73	50 ～ 100	40 ～ 50	50
Nominal Width T(mm)	6 ～ 32	11 ～ 41	6 ～ 32	7.5 ～ 44	-	-	6 ～ 32	20 ～ 30	-	15 ～ 34.5	-	-	-	-	12 ～ 49	20 ～ 49	-	-	-
Length L(mm)	~50	~50	~50	~50	~50	~50	~50	~50	~50	~50	~50	~50	~50	~50	~50	~50	~50	~50	~50
Flange Shape	-	Standard	Standard	Standard	-	-	Standard	Standard	-	Standard	-	-	-	-	-	-	-	-	-
Type	Idlers (Bearing Built-in)	Idlers (Bearing Built-in)	Pulleys	Idlers (Bearing Built-in)	Idlers (Bearing Built-in)	Pulleys	Pulleys	Idlers (Bearing Built-in)	Idlers (Bearing Built-in)	Idlers (Bearing Built-in)	Idlers (Bearing Built-in)	Idlers (Bearing Built-in)	Idlers (Bearing Built-in)	Pulleys	Idlers (Bearing Built-in)	Idlers (Bearing Built-in)	Pulleys	Idlers (Bearing Built-in)	Idlers (Bearing Built-in)
Material	Steel / Aluminum / Stainless Steel / Plastic	Steel	Steel / Aluminum / Stainless Steel	Steel / Plastic	Aluminum	Aluminum	Steel / Aluminum / Stainless Steel	Plastic	Aluminum	Plastic	Aluminum	Stainless Steel	Steel / Aluminum / Stainless Steel	Aluminum	Steel / Plastic	Steel / Plastic	Aluminum	Aluminum	Plastic
Shaft Type	1-Bearing / 1-Bearing on Each End (2-Bearing in Total)	1-Bearing / 2-Bearing at Center	Round Hole	1-Bearing / 2-Bearing at Center	1-Bearing on Each End (2-Bearing in Total)	Round Hole	Round Hole	1-Bearing / 2-Bearing at Center / With Shaft	Round Hole / 1-Bearing on Each End (2-Bearing in Total) / With Shaft	1-Bearing / 2-Bearing at Center	Round Hole	Round Hole / 1-Bearing	1-Bearing on Each End (2-Bearing in Total)	Round Hole	1-Bearing / 2-Bearing at Center	1-Bearing / 2-Bearing at Center	Round Hole	Round Hole / 1-Bearing	1-Bearing
Surface Urethane	Urethane Not Provided	Urethane Not Provided	Urethane Provided / Urethane Not Provided	Urethane Not Provided	Urethane Not Provided	Urethane Not Provided	Urethane Provided / Urethane Not Provided	Urethane Not Provided	Urethane Not Provided	Urethane Not Provided	Urethane Not Provided	Urethane Not Provided	Urethane Not Provided	Urethane Provided	Urethane Not Provided	Urethane Not Provided	Urethane Not Provided	Urethane Not Provided	Urethane Not Provided
Shaft (Bore) Dia. d(mm)	4 ～ 12	8 ～ 12	5 ～ 40	6 ～ 15	5 ～ 35	8 ～ 35	-	-	-	10 ～ 20	10 ～ 40	10 ～ 12	6 ～ 10	8 ～ 35	6 ～ 15	10 ～ 15	15 ～ 40	10 ～ 12	12
Surface Treatment	Not Provided / Black Oxide / Electroless Nickel Plating / Clear Anodize	Electroless Nickel Plating	Not Provided / Black Oxide / Electroless Nickel Plating / Clear Anodize	Not Provided / Electroless Nickel Plating	Clear Anodize	Clear Anodize	Not Provided / Black Oxide / Electroless Nickel Plating / Clear Anodize	Not Provided	Clear Anodize	Not Provided	Hard Clear Anodize	Not Provided	Not Provided / Black Oxide / Electroless Nickel Plating / Clear Anodize	Not Provided	Not Provided / Electroless Nickel Plating	Not Provided / Electroless Nickel Plating	Hard Clear Anodize	Clear Anodize	Not Provided
Shaft End Specification	-	-	-	-	-	Tap / Keyway + Tap	-	-	-	Not Provided	-	Not Provided	-	Tap	-	-	Tap / Keyway + Tap	Not Provided	Not Provided

Configure

Specification/Dimensions

Shape
- Straight
- Crowned
- V-Groove
Larger Image

Clear

With or w/o Flange
- Flange
- No Flange
Larger Image

Clear

Outer Dia. D(Ø)
15

18

20

24

25

28

29

30

34

35

38

40

43

44.5

45

48

49.5

50

54

55

57

58

60

63

64

65

70

73

74

75

78

80

100
Drawing

Clear

Nominal Width T(mm)
6

7.5

10.5

11

12

14.5

15

16

19

19.5

20

21

24

24.5

25

26

27

29

30

32

34

34.5

35

40

41

44

45

49

50

54

55

60

65

70

80

92
Drawing

Clear

Length L(mm)
- ~50
- ~100
- ~300
- ~500
Clear

Flange Shape
- Standard
Images

Clear

Type
- Idlers (Bearing Built-in)
- Pulleys
Clear

Material
- Steel
- Aluminum
- Stainless Steel
- Plastic
Clear

Shaft Type
- Round Hole
- 1-Bearing
- 2-Bearing at Center
- 1-Bearing on Each End (2-Bearing in Total)
- With Shaft
Larger Image

Clear

Surface Urethane
- Urethane Provided
- Urethane Not Provided
Images

Clear

Shaft (Bore) Dia. d(mm)
4

5

6

8

8A

10

12

15

17

20

25

30

35

40

50
Drawing

Clear

Surface Treatment
- Not Provided
- Black Oxide
- Electroless Nickel Plating
- Clear Anodize
- Hard Clear Anodize
Clear

Shaft End Specification
- Not Provided
- Tap
- Keyway + Tap
Images

Clear

Related Categories to Flat Belt Pulleys

- Flat Belt Pulleys
- Flat Belt Idlers

FAQ Flat Belt Pulleys

Question: What are Flat Belt Pulleys and how are they used in machinery?: Answer: Flat Belt Pulleys are mechanical drive components designed to transmit motion and power between rotating shafts using flat belts. They are commonly used in applications that require smooth and efficient power transmission, such as in conveyors, HVAC systems, packaging machinery, and other industrial automation setups.
Question: What key factors should be considered when selecting a Flat Belt Pulley?: Answer: Important selection criteria include outer diameter (D), nominal width (T), length (L), shaft compatibility (round bore or bearing type), and material (steel, aluminum, stainless steel, or plastic). The operating conditions—like load, speed, temperature, and environment—also significantly impact the ideal choice.
Question: How does pulley shape affect performance in a flat belt system?: Answer: The shape—such as straight, crowned, or grooved—determines how the belt tracks. Crowned pulleys self-center the belt to reduce slippage, straight pulleys offer precise alignment for tightly controlled setups, and grooved designs can provide better traction in specialized applications.
Question: What role does a flange play on a Flat Belt Pulley?: Answer: A flange helps to keep the belt aligned on the pulley and prevents it from slipping off during operation. Flanged pulleys are ideal in applications where lateral belt movement must be minimized for consistent and safe operation.
Question: What materials are commonly used for Flat Belt Pulleys and why?: Answer:
• Steel: High strength and durability for demanding loads
• Aluminum: Lightweight and corrosion-resistant, ideal for mid-load systems
• Stainless Steel: Excellent corrosion resistance, suitable for harsh or clean environments
• Plastic: Low weight, quieter operation, and cost-effective for light-duty use
Question: How do I determine the right pulley diameter for my system?: Answer: The ideal pulley diameter depends on the required speed and torque. Larger diameters increase belt speed but lower torque, while smaller diameters increase torque but reduce speed. Matching pulley size to your machine's performance specifications ensures efficient power delivery.
Question: What advantages do idlers provide in flat belt systems?: Answer: Idler pulleys, especially those with built-in bearings, help maintain proper belt tension, guide the belt’s path, and reduce vibrations and wear. They're essential for systems with long belt paths or direction changes.
Question: Can Flat Belt Pulleys be customized for unique applications?: Answer: Yes, many manufacturers offer customizations including material selection, surface treatment (e.g., anodizing, plating), and custom bore dimensions. Custom pulleys improve performance, fit, and longevity for specific use cases.
Question: What is the effect of surface treatment on Flat Belt Pulley performance?: Answer: Treatments like black oxide, nickel plating, or anodizing enhance corrosion resistance, reduce friction, and improve durability. These are particularly useful in high-humidity or chemically exposed environments.
Question: How do I select the right bore diameter for a Flat Belt Pulley?: Answer: The bore diameter must match the shaft size. Account for tolerances and any keyways needed for secure mounting. It should fit snugly—tight enough to prevent slipping but not so tight that it hampers installation or expansion due to heat.
Question: What configuration options are available in terms of pulley length?: Answer: Flat Belt Pulleys come in a range of lengths (e.g., short: ~50 mm, medium: ~100 mm, long: ~300 mm) to suit various belt widths and machine layouts. The length selected depends on belt travel and space constraints.
Question: Why is pulley width important in flat belt systems?: Answer: The pulley width must correspond to the belt width. A mismatch can cause slippage or uneven tracking, leading to reduced efficiency and potential damage. Proper width ensures stable operation and even belt wear.
Question: What are common issues with Flat Belt Pulleys and how can they be avoided?: Answer: Typical problems include belt slippage, misalignment, and excessive wear. These can be prevented with correct sizing, shape selection, regular maintenance, and using pulleys suited to the environmental conditions (e.g., corrosion-resistant coatings).
Question: How does material choice affect pulley weight and system performance?: Answer: Material directly influences weight—aluminum and plastic pulleys are lighter, which reduces system load and bearing wear. Steel and stainless steel offer strength but add weight, which may be a concern in high-speed or mobile systems.