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Flat Belt Pulleys（With or w/o Flange：Flange）
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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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
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 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 
Same day or more
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Economy series
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MiSUMi EconomyFlat Belts Pulleys Width 6 - 32
MiSUMi EconomyMISUMI
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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 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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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 UrethaneShape 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 25 ～ 80 - ~50 / ~100 - Idlers (Bearing Built-in) Aluminum 1-Bearing on Each End (2-Bearing in Total) Urethane Not Provided 6 ～ 35 Clear Anodize - Days to Ship: 10 Day(s) or more
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 TypeShape 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 Flange 25 ～ 80 - ~50 / ~100 - 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 IdlerShape 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 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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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 ～ 45 ~50 / ~100 Standard Idlers (Bearing Built-in) Plastic 1-Bearing / 2-Bearing at Center / With Shaft Urethane Not Provided - Not Provided - From: ₹ 2,336.00 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 IdlerShape 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 ～ 65 ~50 / ~100 Standard Idlers (Bearing Built-in) Plastic 1-Bearing / 2-Bearing at Center Urethane Not Provided 10 ～ 20 Not Provided Not Provided From: ₹ 1,208.00 Days to Ship: 5 Day(s) or more
5 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 L110-510Shape 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 30 ～ 80 - ~50 / ~100 - 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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You can add up to 6 items per a category to the compare list.    | You can add up to 6 items per a category to the compare list.  | You can add up to 6 items per a category to the compare list.  | You can add up to 6 items per a category to the compare list.  | You can add up to 6 items per a category to the compare list.  | You can add up to 6 items per a category to the compare list.  | You can add up to 6 items per a category to the compare list.  | You can add up to 6 items per a category to the compare list.  | |
| Brand | MISUMI | MISUMI | MISUMI | MISUMI | MISUMI | NABEYA BI-TECH | NABEYA BI-TECH | MISUMI |
| Product Series | 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 | Pulleys for Flat Belts with Urethane (Width L=25 ~ 100) - Crowned, Crosspiece Groove Straight | ||||
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| From | ₹ 1,100.62 Special Price On Sale Till 31/03/2026 | ₹ 2,336.00 | ₹ 1,208.00 | |||||
| Days to Ship | Same day or more | 9 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 | 10 Day(s) or more |
| Shape | Straight | Straight | Straight | Crowned | Straight | Straight | Straight | Crowned / V-Groove |
| With or w/o Flange | Flange | Flange | Flange | Flange | Flange | Flange | Flange | Flange |
| Outer Dia. D(Ø) | 15 ～ 50 | 15 ～ 100 | 25 ～ 80 | 25 ～ 80 | 15 ～ 100 | 45 ～ 50 | 40 ～ 75 | 30 ～ 80 |
| Nominal Width T(mm) | 6 ～ 32 | 6 ～ 32 | - | - | 6 ～ 32 | 20 ～ 45 | 15 ～ 65 | - |
| Length L(mm) | ~50 | ~50 | ~50 / ~100 | ~50 / ~100 | ~50 | ~50 / ~100 | ~50 / ~100 | ~50 / ~100 |
| Flange Shape | - | Standard | - | - | Standard | Standard | Standard | - |
| Type | Idlers (Bearing Built-in) | Pulleys | Idlers (Bearing Built-in) | Pulleys | Pulleys | Idlers (Bearing Built-in) | Idlers (Bearing Built-in) | Pulleys |
| Material | Steel / Aluminum / Stainless Steel / Plastic | Steel / Aluminum / Stainless Steel | Aluminum | Aluminum | Steel / Aluminum / Stainless Steel | Plastic | Plastic | Aluminum |
| Shaft Type | 1-Bearing / 1-Bearing on Each End (2-Bearing in Total) | Round Hole | 1-Bearing on Each End (2-Bearing in Total) | Round Hole | Round Hole | 1-Bearing / 2-Bearing at Center / With Shaft | 1-Bearing / 2-Bearing at Center | Round Hole |
| Surface Urethane | Urethane Not Provided | Urethane Provided / Urethane Not Provided | Urethane Not Provided | Urethane Not Provided | Urethane Provided / Urethane Not Provided | Urethane Not Provided | Urethane Not Provided | Urethane Provided |
| Shaft (Bore) Dia. d(mm) | 4 ～ 12 | 5 ～ 40 | 6 ～ 35 | 8 ～ 35 | - | - | 10 ～ 20 | 8 ～ 35 |
| Surface Treatment | Not Provided / Black Oxide / Electroless Nickel Plating / Clear Anodize | Not Provided / Black Oxide / Electroless Nickel Plating / Clear Anodize | Clear Anodize | Clear Anodize | Not Provided / Black Oxide / Electroless Nickel Plating / Clear Anodize | Not Provided | Not Provided | Not Provided |
| Shaft End Specification | - | - | - | Tap / Keyway + Tap | - | - | Not Provided | Tap |
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Specification/Dimensions
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V-Groove
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Length L(mm)
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Flange Shape
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- Idlers (Bearing Built-in)
- Pulleys
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1-Bearing -
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Surface Urethane
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Surface Treatment
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Shaft End Specification
Related Categories to Flat Belt Pulleys
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.
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