Round belt pulleys / half-round groove double / grub screw clamping / stainless steel, aluminium / anodised (Part Numbers - CAD Download)

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Back to the Category Round Belt Pulleys, Idlers

Technical Drawing - Round Belt Track Rollers

Pulleys for Round Belts/Double Grooves:Related Image

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Available dimensions and tolerances can be found under the tab More Information.

Basic Properties (e.g., material, hardness, coating, tolerance) - Round Belt Track Rollers

Type	Material	Surface Treatment	Accessory
MBWAC	Aluminum Alloy 5000 series	Clear Anodize	Set Screw 2 pcs. (EN 1.4301 Equiv.)
MBWS	EN 1.4301 Equiv.	-	Set Screw 2 pcs. (EN 1.4301 Equiv.)

Further specifications can be found under the tab More Information.

Composition of a Product Code - Round Belt Track Rollers

Part Number	-	R	-	Shaft Bore Specification, I.D.
MBWS30	-	1.6	-	P5

Alterations - Round Belt Track Rollers

General Information - Round Belt Track Rollers

Round belt disk with hub - round belt disk with two grooves as idler pulley - plastic idler pulley - round belt disk with hub and double groove - round belt disk with clamping scar

Selection details of round belt discs/idler pulleys

- Material: aluminum, steel, stainless steel, resin type (polyacetal)

- Coatings: untreated, burnished, nickel-plated, anodized

- Groove shape: V-groove (trapezoid groove), U-groove

- Belt diameter: single groove, double groove

- Effective diameter: 2 to 10 mm

- Shaft diameter: 15 to 140 mm

- Mounting: 3 to 20 mm

Description/Basics

The round belt disk for mechanical engineering is generally intended for drive and power transmission.
A system with round belts and round belt disk can transmit force over larger distances. An idler pulley is recommended depending on the distance to the guide. This reduces oscillations in a belt drive and minimizes the risk of the belt jumping off the round belt pulley. In addition, the belt tension of a round belt is important for power transmission. Depending on the application, the tension can be produced via a round belt disk with integrated ball bearing (tension roller). In addition, the use of a tension roller can increase the wrap angle and thus the contact surface of the belt on the round belt disk. Round belt disks made of plastic are often used for tensioning the round belt.

In principle, MISUIM offers two types of round belt discs. These are available with a trapezoidal groove (V-groove) or radius (U-groove) suitable for the round belt. The V-groove round belt disks are adapted to the round belt and offer the advantage that they form up to three contact points for the round belt due to their shape. In comparison, round belt disks with a V-groove can thus have a higher slip torque.
MISUMI also offers round belt disks with two grooves for drives mounted side-by-side. The combination of two round belt disks can be absorbed with force and simultaneously released and forwarded. In pulleys for round belts with double grooves, the force can also be delivered in different directions or systems. Therefore, it may be possible to forgo a drive unit and reduce costs.
The drive wheels for round belts can be fastened on a axles / rotary shafts in various ways. A flat round belt disk is mounted on an axle using a clamping screw. MISUMI also offers this as a round belt disk with hub and optionally with keyways. Another commonly used variant is the belt pulley with clamping scar.
The belt pulleys for round belts can often be found in transport technology to convey light objects. These are usually operated in a permanent and constant transport.

If higher forces occur in a system and any slip is undesirable, a timing pulleys can be used.

Application Examples - Round Belt Track Rollers

Application example conveyor belt - round belts with two grooves - conveyor belts with round belts - round belt discs with axle

Application example conveyor belt
(1) Round belt disk with double groove, (2) rotary shaft, (3) Round belt, (4) Workpiece

Application example round belt conveyor belt - roller conveyor - conveyor belt with round belt - round belt wheel with round belt

Application example conveyor belt
(1) Round belt, (2) Motor, (3) Idler pulley/return roller, (4) Drive wheel for round belt

Application example roller conveyors - round belt discs with roller idlers - round belt discs with rollers - round belt discs with rollers - round belt discs with conveyor rollers

Application example roller conveyor
(1) Round belt disk, (2) Round belts, (3) Conveyor rollers

Application example round belt disk - round belt drive with bearing housing - round belt drive distribution

Application example
(1) Round belt disc with hub, (2) round belt, (3) rotary shaft, (4) bearing housing

Industrial Applications

3D printer industry

Automotive industry

Pharmaceutical industry

Packaging industry

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Part Number
MBWA15-1.1-P[3-8/1]
MBWA20-1.1-P[4-10/1]
MBWA20-1.6-P[3-10/1]
MBWA23-2.1-P[5-12/1]
MBWA28-2.1-P[5-12/1]
MBWA28-2.6-P[5-12/1]
MBWA28-3.1-P[5-12/1]
MBWA30-1.1-P[4-12/1]
MBWA30-1.6-P[5-12/1]
MBWA30-2.1-P[5-12/1]
MBWA38-3.1-P[5-20/1]
MBWA40-1.6-P[5-12/1]
MBWA40-2.1-P[5-12/1]
MBWA40-2.6-P[5-20/1]
MBWA45-1.6-P[5-20/1]
MBWA45-2.1-P[5-18/1]
MBWA48-2.1-P[5-20/1]
MBWA48-3.1-P[5-20/1]
MBWA50-2.6-P[5-20/1]
MBWA50-3.1-P[5-20/1]
MBWA50-4.1-P[5-20/1]
MBWA60-3.1-P[5-20/1]
MBWA60-4.1-P[5-20/1]
MBWA60-5.1-P[5-20/1]
MBWA75-3.1-P[5-20/1]
MBWA100-3.1-P[5-20/1]
MBWA100-4.1-P[5-20/1]
MBWA100-5.1-P[5-20/1]
MBWA140-5.1-P[5-20/1]

Minimum order quantity	Standard Shipping Days ?	RoHS	Applicable Belt Dia. (Ø)	Pitch Circle Dia. P.D. (Ø)	Material	Surface Treatment	Shaft Dia. d (or P) (Ø)	R (mm)
1	9 Days	10	2	15	[Aluminum] EN AW-5052 Equiv.	Electroless Nickel Plating	3 ～ 8	1.1
1	9 Days	10	2	20	[Aluminum] EN AW-5052 Equiv.	Electroless Nickel Plating	4 ～ 10	1.1
1	9 Days	10	3	20	[Aluminum] EN AW-5052 Equiv.	Electroless Nickel Plating	3 ～ 10	1.6
1	9 Days	10	4	23	[Aluminum] EN AW-5052 Equiv.	Electroless Nickel Plating	5 ～ 12	2.1
1	9 Days	10	4	28	[Aluminum] EN AW-5052 Equiv.	Electroless Nickel Plating	5 ～ 12	2.1
1	9 Days	10	5	28	[Aluminum] EN AW-5052 Equiv.	Electroless Nickel Plating	5 ～ 12	2.6
1	9 Days	10	6	28	[Aluminum] EN AW-5052 Equiv.	Electroless Nickel Plating	5 ～ 12	3.1
1	9 Days	10	2	30	[Aluminum] EN AW-5052 Equiv.	Electroless Nickel Plating	4 ～ 12	1.1
1	9 Days	10	3	30	[Aluminum] EN AW-5052 Equiv.	Electroless Nickel Plating	5 ～ 12	1.6
1	9 Days	10	4	30	[Aluminum] EN AW-5052 Equiv.	Electroless Nickel Plating	5 ～ 12	2.1
1	9 Days	10	6	38	[Aluminum] EN AW-5052 Equiv.	Electroless Nickel Plating	5 ～ 20	3.1
1	9 Days	10	3	40	[Aluminum] EN AW-5052 Equiv.	Electroless Nickel Plating	5 ～ 12	1.6
1	9 Days	10	4	40	[Aluminum] EN AW-5052 Equiv.	Electroless Nickel Plating	5 ～ 12	2.1
1	9 Days	10	5	40	[Aluminum] EN AW-5052 Equiv.	Electroless Nickel Plating	5 ～ 20	2.6
1	9 Days	10	3	45	[Aluminum] EN AW-5052 Equiv.	Electroless Nickel Plating	5 ～ 20	1.6
1	9 Days	10	4	45	[Aluminum] EN AW-5052 Equiv.	Electroless Nickel Plating	5 ～ 18	2.1
1	9 Days	10	4	48	[Aluminum] EN AW-5052 Equiv.	Electroless Nickel Plating	5 ～ 20	2.1
1	9 Days	10	6	48	[Aluminum] EN AW-5052 Equiv.	Electroless Nickel Plating	5 ～ 20	3.1
1	9 Days	10	5	50	[Aluminum] EN AW-5052 Equiv.	Electroless Nickel Plating	5 ～ 20	2.6
1	9 Days	10	6	50	[Aluminum] EN AW-5052 Equiv.	Electroless Nickel Plating	5 ～ 20	3.1
1	9 Days	10	8	50	[Aluminum] EN AW-5052 Equiv.	Electroless Nickel Plating	5 ～ 20	4.1
1	9 Days	10	6	60	[Aluminum] EN AW-5052 Equiv.	Electroless Nickel Plating	5 ～ 20	3.1
1	9 Days	10	8	60	[Aluminum] EN AW-5052 Equiv.	Electroless Nickel Plating	5 ～ 20	4.1
1	9 Days	10	10	60	[Aluminum] EN AW-5052 Equiv.	Electroless Nickel Plating	5 ～ 20	5.1
1	9 Days	10	6	75	[Aluminum] EN AW-5052 Equiv.	Electroless Nickel Plating	5 ～ 20	3.1
1	9 Days	10	6	100	[Aluminum] EN AW-5052 Equiv.	Electroless Nickel Plating	5 ～ 20	3.1
1	9 Days	10	8	100	[Aluminum] EN AW-5052 Equiv.	Electroless Nickel Plating	5 ～ 20	4.1
1	9 Days	10	10	100	[Aluminum] EN AW-5052 Equiv.	Electroless Nickel Plating	5 ～ 20	5.1
1	9 Days	10	10	140	[Aluminum] EN AW-5052 Equiv.	Electroless Nickel Plating	5 ～ 20	5.1

Back to the Category Round Belt Pulleys, Idlers

Technical Drawing - Round Belt Track Rollers

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Specification Tables - Round Belt Track Rollers

Part Number		R	Shaft Bore Specification, I.D.	S	D	D₁	D₂	L	ℓ	B	M (Coarse)	Accessory: Set Screw	Applicable Round Belt Dia.	Unit Price
Type	P.D.		P (H7) 1mm Increment											MBWAC	MBWS
MBWAC MBWS	15	1.1	3~8	4	12	17	13	14	3	5.8	M3	M3x3	2
	20		4~10		16	22	18
	30		4~12		20	32	28
	20	1.6	3~10	5	16	22	17	16	3	5.8	M3	M3x3	3
	30		5~12		20	32	27
	40					42	37
	45		5~20		30	47	42
	23	2.1	5~12	6	20	25	19	18	3	5.8	M3	M3x3	4
	28					30	24
	30					32	26
	40					42	36
	45		5~18		25	47	41	20	4	7.8	M4	M4x3
	48		5~20		30	50	44
	28	2.6	5~12	7	20	30	23	20	3	5.8	M3	M3x3	5
	40		5~20		30	42	35	22	4	7.8	M4	M4x3
	50					52	45
	28	3.1	5~12	8	22	30	22	22	3	5.8	M3	M3x3	6
	38		5~20		30	40	32	24	4	7.8	M4	M4x3
	48					50	42
	50					52	44
	60					62	54
	75					77	69
	100					102	94
	50	4.1	5~20	10	30	52	42	30	5	9.8	M5	M5x4	8
	60					62	52
	100					102	92
	60	5.1	5~20	12	34	62	50	34	5	9.8	M5	M5x4	10
	100					102	90
	140					142	130

For MBWAC, surface treatment may not be applied to shaft bores.

Alterations - Round Belt Track Rollers

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Basic information

Pulleys/Idlers	Pulleys	Number of Grooves	Double	Groove Shape	U Groove
Product Type	Pulley (No Bearing)	Pulley Type	Shape B

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Basic Attributes

Applicable Belt Dia.(Ø)
2

3

4

5

6

8

10
Clear
Pitch Circle Dia. P.D.(Ø)
15

20

23

28

30

38

40

45

48

50

60

75

100

140
Clear
Material
- Aluminum
  - EN AW-5052 Equiv.
- EN 1.4301 Equiv.
Clear
Shaft Dia. d (or P)(Ø)
[3-20/1Ø Unit(s)]
Clear
R(mm)
1.1

1.6

2.1

2.6

3.1

4.1

5.1
Clear
Type
- MBWA
- MBWAC
- MBWS
Clear
Surface Treatment
- Not Provided
- Electroless Nickel Plating
- Clear Anodized Aluminum
Clear
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Optional Attributes

The specifications and dimensions of some parts may not be fully covered. For exact details, refer to manufacturer catalogs .

Frequently Asked Questions (FAQ)

Question:
What is the dimension of the keyway?: Answer:
The keyway of MISUMI round belt track rollers are manufactured according to the new JIS standard (B1301) or the previous JIS standard. Therefore, it is recommended to use a keyway from MISUMI, as these are matched. Dimensions are shown in the Keyway Overview PDF
Question:
How can round belts prevent the round belts from popping off?: Answer:
A round belt can jump or slip off the round belts by adjusting the correct belt tension. Depending on the application and the distance between the round belt track rollers, it requires an idler pulley. MISUMI also offers this for the appropriate belt diameters. These are already equipped with ball bearings and available in steel, stainless steel, aluminum and plastic.
Question:
Are round belt track rollers suitable for strong forces?: Answer:
If higher forces are transmitted, a round belt track roller with trapezoidal groove (V-groove) can be utilised. However, if very high forces are transmitted and slip is undesirable, a synchronous pulley and synchronous belt can be used. These can transmit higher forces without slipping.
Question:
How can an idler pulley be mounted?: Answer:
The idler pulley for the round belt comes already equipped with a ball bearing. Here, the bearing can be mounted on a clamping device with a cantilever pin. However, MISUMI also offers idler pulleys round belts with already pressed axle bolts. This can simplify assembly and reduce the assembly time.
Question:
Are there round belt track rollers made of aluminum?: Answer:
In addition, MISUMI offers in its product assortment round belt track rollers made of aluminum. These have good corrosion resistance and a low density. The round belt track rollers made of aluminum are well-suited for saving weight and generate a lower inertial mass during operation compared to other materials. In addition, the aluminum round belt track rollers are available with single or double groove, as well as V-groove (trapezoidal groove) and U-groove.