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（Surface Treatment：Black Oxide）

Flat Belt Pulleys products in the Automation Components category. Specified by Surface Treatment Black Oxide. There are around 5 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	(5) (1) IMAO CORPORATION (0) KONISHI (0) NABEYA BI-TECH (0)
CAD	2D 3D

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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

New at MISUMI? Get upto ₹10,000 Discount* on Your First Order. Click to Register Now

· 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	1-Bearing / 1-Bearing on Each End (2-Bearing in Total)	Urethane Not Provided	4 ～ 12	Black Oxide	-

From: ₹ 1,329.51
Special Price
Days to Ship: 7 Day(s) or more

7 Day(s) or more

Economy series

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MiSUMi Economy

Flat Belts Pulleys Width 6 - 32

MiSUMi Economy

MISUMI

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

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	Round Hole	Urethane Not Provided	5 ～ 40	Black Oxide	-

Days to Ship: 9 Day(s)

9 Day(s)

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

MISUMI

New at MISUMI? Get upto ₹10,000 Discount* on Your First Order. Click to Register Now

· 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	Round Hole	Urethane Not Provided	-	Black Oxide	-

Days to Ship: 13 Day(s) or more

13 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 / ~100	-	Idlers (Bearing Built-in)	Steel	1-Bearing on Each End (2-Bearing in Total)	Urethane Not Provided	6 ～ 10	Black Oxide	-

From: ₹ 1,620.74
Days to Ship: 9 Day(s) or more

9 Day(s) or more

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Idlers for Flat Belts-Width L100-300

MISUMI

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

· Idlers type: Bearing Built-in.
· Shape of Idlers: Straight type.
· Shaft Type : Bearing on Each End (2-Bearing in Total)
· The product code series: ROFWB and ROFAWB
· Material Idlers body ROFWB: S45C Equivalent and surface treatment Black Oxide solution.
· Material Idlers body ROFAWB: Aluminum Alloy and surface treatment Clear Anodize solution.
· Outer Diameter: 30 and 40 mm.
· Shaft (Bore) Diameter: 8 and 12 mm.
· Material (Bearing): Bearing FL678ZZ (For ROFWB) and Bearing B6801ZZ (For ROFAWB)
· Economy Flat Belt Idlers - Short Length

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	-	~100 / ~300	-	Idlers (Bearing Built-in)	Steel	1-Bearing on Each End (2-Bearing in Total)	Urethane Not Provided	8 ～ 12	Black Oxide	-

Days to Ship: 10 Day(s) or more

10 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

	You can add up to 6 items per a category to the compare list.Compare	You can add up to 6 items per a category to the compare list.Compare	You can add up to 6 items per a category to the compare list.Compare	You can add up to 6 items per a category to the compare list.Compare	You can add up to 6 items per a category to the compare list.Compare
Brand	MISUMI	MISUMI MiSUMi Economy	MISUMI	MISUMI	MISUMI
Product Series	Idlers for Flat Belts-Flanged Type/Crowned Type/Width L6-32	Flat Belts Pulleys Width 6 - 32	Pulleys for Flat Belts (Width T=6 ~ 32) - Flanged, Crowned, Press-Fit Urethane	Idlers for Flat Belts-Width L38-90	Idlers for Flat Belts-Width L100-300
CAD	2D / 3D		2D / 3D	2D / 3D	2D / 3D
From	₹ 1,329.51 Special Price On Sale Till 31/03/2026			₹ 1,620.74
Days to Ship	7 Day(s) or more	9 Day(s)	13 Day(s) or more	9 Day(s) or more	10 Day(s) or more
Shape	Straight / Crowned	Straight / Crowned	Straight / Crowned	Straight	Straight
With or w/o Flange	Flange / No Flange	Flange / No Flange	Flange / No Flange	No Flange	No Flange
Outer Dia. D(Ø)	15 ～ 50	15 ～ 100	15 ～ 100	20 ～ 40	30 ～ 40
Nominal Width T(mm)	6 ～ 32	6 ～ 32	6 ～ 32	-	-
Length L(mm)	~50	~50	~50	~50 / ~100	~100 / ~300
Flange Shape	-	Standard	Standard	-	-
Type	Idlers (Bearing Built-in)	Pulleys	Pulleys	Idlers (Bearing Built-in)	Idlers (Bearing Built-in)
Material	Steel	Steel	Steel	Steel	Steel
Shaft Type	1-Bearing / 1-Bearing on Each End (2-Bearing in Total)	Round Hole	Round Hole	1-Bearing on Each End (2-Bearing in Total)	1-Bearing on Each End (2-Bearing in Total)
Surface Urethane	Urethane Not Provided	Urethane Not Provided	Urethane Not Provided	Urethane Not Provided	Urethane Not Provided
Shaft (Bore) Dia. d(mm)	4 ～ 12	5 ～ 40	-	6 ～ 10	8 ～ 12
Surface Treatment	Black Oxide	Black Oxide	Black Oxide	Black Oxide	Black Oxide
Shaft End Specification	-	-	-	-	-

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

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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.