The Best Mechanical Round Belt Pulleys

Looking for the best Mechanical Round Belt Pulleys?

Discover now our comparison of the best Mechanical Round Belt Pulleys. It is never easy to choose from the wide range of offers. On the market, you will find an incalculable number of models, all at different prices. And as you will discover, the best Mechanical Round Belt Pulleys are not always the ones at the highest prices! Many criteria are used, and they make the richness and relevance of this comparison.
To help you make the best choice among the hundreds of products available, we have decided to offer you a comparison of the Mechanical Round Belt Pulleys in order to find the best quality/price ratio. In this ranking, you will find products listed according to their price, but also their characteristics and the opinions of other customers. Also discover our comparisons by categories. You won’t have to choose your products at random anymore.

No. 1

BQLZR 41x16x6MM Silver Aluminum Alloy Single Groove 6MM Fixed Bore Pulley for Motor Shaft 3-5MM PU Round Belts

Made of aluminum, Groove step pulley, long time and use.
41MM diameter,6mm aperture,16MM Thickness.
Suitable for 3-5MM PU round belt.
Commonly used for DIY small drilling machine, milling machine, small unpowered spindle of machine tool.
Suitable for 6MM optical axis installation, the top screw hole specification on the side of the boss is metric M4, arranged at 90 degrees

No. 2

84pcs Transmission Belt Pulley Set 2mm Shaft Diameter Plastic Gears Pulley Shaft Belt Worm Rack Set DIY Gear Assortment Accessories for DIY Model Toy Projects

2mm Shaft Diameter - All pulleys in this 84pcs set feature a standard 2mm shaft diameter, ensuring compatibility and easy integration into various DIY model toy projects for seamless functionality.
Versatile Combination - With a variety of accessories included, this transmission belt pulley rubber band set offers a versatile combination to meet various customer needs, making it an ideal choice for DIY enthusiasts and model toy enthusiasts alike.
Quality Material - Crafted from high-quality material, this set guarantees durability and long-lasting performance, providing reliable support for your DIY projects without compromising on quality.
Comprehensive DIY Set - This DIY project set includes 84 kinds of pulley kits, covering most combinations of pulleys, rubber bands, and other accessories, catering to the vast majority of DIY enthusiasts and meeting various needs for your projects.
Convenient Package - Featuring a variety of pulleys and rubber bands, this set includes 5 x pulley 62A, 5 x pulley 92A, 5 x pulley 132A, 5 x pulley 16.82A, 5 x pulley 102B, 5 x pulley 122B, 5 x pulley 182A, 5 x pulley 242A, 10 x Yellow Rubber Band 1.5x1.5x19mm, 10 x Yellow Rubber Band 1.5x1.5x28mm, 20 x Colored Rubber Band 1.5x1.5x40mm, 4 x Yellow Conveyor Belt CDD2x50mm, providing a comprehensive solution for your DIY projects.

No. 3

CNBTR 25mm Bore 54mm-150mm Outter Dia Aluminum 5 Slot A Type V-Shaped Pagoda Pulley 5 Step Pulley Belt 12.7mm Belt Width

Suitable for A Type V-Shaped Pulley Timing Belt.
V-type 5-speed motor shaft drive pulley can be used for all types of machines. It can be adapted for different speed requirements.
Hole diameter 25mm, 5-level outer diameter: 54mm, 76mm, 102mm, 128mm, 150mm, 5-slot design can be applied to different speed ratio requirements.
Made of high quality Aluminum ,strong and sturdy.
Installation method: 1. After receiving the pulley, put the pulley on the fire and bake for 2 minutes 2. Align the keyway of the pulley and the motor shaft 3. When knocking, you must put a damping block on it, otherwise the pulley will be easily damaged.

No. 4

CHANCS 20mm Single Groove Pulley 8mm Fixed Bore Pulley for Drilling Machine 6MM PU Round Belt

Description:The inner hole of the pulley is accurate in size, formed with one knife, runs smoothly, and has high concentricity.Suitable for round belts, large contact area, non-slip and more durable.
Specification:Outer Diameter:20mm,Inner Diameter:8mm,Overall Thickness: 15mm,Groove Bottom Diameter:11mm,Groove Width:7mm,Groove Depth: about4.5mm,Applicable Belts:6mm belt.
Package Content: 1×Pulley
Application:Mainly used in motor, mini spindle, model transmission design, motor shaft transmission, etc.
Application:Mainly used in motor, mini spindle, model transmission design, motor shaft transmission, etc. Attention:Pulleys with an outer diameter of 16mm and pulleys with other specifications are not suitable for use together. Pulley selection: first measure the diameter of the shaft to be installed, such as the shaft diameter of 8mm, and the pulley with an inner diameter of 8mm. This size will not be large or small, and the installation is just right.

No. 5

HARFINGTON V-Type Pulley 3.17mm Bore 20mm Outer Dia Single Groove Aluminum Alloy for 3MM PU Round Belt Motor Shaft Drilling Machine

Size - Aperture Diameter: 3.17mm; Outer Diameter: 20mm; Height: 9.5mm; The pulley is a single groove, fixed hole with machine screws, which can be tightened with a plum drill bit, easy to fix and use.
Material - The V-Type single groove motor pulley is made of aluminum alloy, with small precision error, high-speed rotation without shaking, effectively suppressing transmission noise and fluctuations, and improving the stability of the belt operation.
Usage - This series of pulleys can be combined with any two adjacent pulleys upside down. For example, if a diameter 31mm pulley and a diameter 41mm pulley with the same aperture are installed on the motor, a double-layer pulley can be formed.
Application - The V-shaped Single Groove pulley is suitable for 3mm PU round belts, 90° top screw fastening design, can adapt to a wide range of round optical axes, single flat shaft, 90° double D axis, 180° double D axis, suitable for DIY small drilling machines, Milling machines, small unpowered spindles of machine tools, can also be used for most fitness equipment.
Note - For the stiffness of the thin pulley shaft, it is recommended to choose a 4mm belt for a pulley shaft below 8mm and a 5mm belt for a pulley shaft above 8mm.

No. 6

uxcell 2Pcs Single Groove Pulley, 8mm Fixed Bore 20mm Outer Diameter Aluminum Alloy Mechanical Belt Pulley with Hex Wrench for 6mm PU Round Belt

Package Content: 2Pcs Single Groove Pulley; Aperture Diameter: 8mm / 0.31"; Outer Diameter: 20mm / 0.79"; And applicable for 6mm PU round belt
Material: Our single groove pulley is made of aluminum alloy, with fine workmanship, high strength, firm and stable, and corrosion-resistant
Design: The groove design is conducive to the precise alignment between the belt and the pulley, reducing errors and improving transmission efficiency; it runs smoothly and rotates at high speed without shaking, effectively suppressing transmission noise and fluctuations and improving the stability of belt operation
Easy To Use: Compared with other transmission methods, the single groove pulley has a simple structure and is easy and quick to install. You only need to put the belt of the correct specification on the single groove pulley. Before placing an order, you need to measure the diameter of the shaft to be installed
Wide Application: Aluminum alloy single groove is suitable for motors, micro spindles, model transmission design, motor shaft transmission, etc

No. 7

uxcell 2Pcs Single Groove Pulley, 10mm Fixed Bore 20mm Outer Diameter Aluminum Alloy Mechanical Belt Pulley with Hex Wrench for 6mm PU Round Belt

Package Content: 2Pcs Single Groove Pulley; Aperture Diameter: 10mm / 0.39"; Outer Diameter: 20mm / 0.79"; And applicable for 6mm PU round belt
Material: Our single groove pulley is made of aluminum alloy, with fine workmanship, high strength, firm and stable, and corrosion-resistant
Design: The groove design is conducive to the precise alignment between the belt and the pulley, reducing errors and improving transmission efficiency; it runs smoothly and rotates at high speed without shaking, effectively suppressing transmission noise and fluctuations and improving the stability of belt operation
Easy To Use: Compared with other transmission methods, the single groove pulley has a simple structure and is easy and quick to install. You only need to put the belt of the correct specification on the single groove pulley. Before placing an order, you need to measure the diameter of the shaft to be installed
Wide Application: Aluminum alloy single groove is suitable for motors, micro spindles, model transmission design, motor shaft transmission, etc

SaleNo. 8

BQLZR 31x15x8MM Silver Aluminum Alloy Single Groove 8MM Fixed Bore Pulley for Motor Shaft 3-5MM PU Round Belt

Made of aluminum, Groove step pulley, long time and use, rugged and durable.
31MM diameter,8mm aperture,15MM Thickness.Aluminum metal metric setscrews Finish is smooth and the interior bore is accurate (8mm)
Suitable for 3-5MM PU round belt.
Commonly used for DIY small drilling machine, milling machine, small unpowered spindle of machine tool.
Perfect fit for small three phase generator/ motor

No. 9

BQLZR 58x16x8MM Silver Aluminum Alloy Single Groove 8MM Fixed Bore Pulley for Drilling Machine 3-5MM PU Round Belt

Made of aluminum, Groove step pulley, long time and use.
58MM diameter,8mm aperture,16MM Thickness.Aluminum metal metric setscrews Finish is smooth and the interior bore is accurate (8mm).
Suitable for 3-5MM PU round belt.
Commonly used for DIY small drilling machine, milling machine, small unpowered spindle of machine tool.
Perfect fit for small three phase generator/ motor
Pulley hole type: fixed hole, with machine screws, you can use a torx drill to tighten the screws, easy to fix and use.
Application:Suitable for 8MM optical axis installation, the top screw hole specification on the side of the boss is metric M4, arranged at 90 degrees
Note:Please confirm the item size before purchasing.

No. 10

uxcell 1Pcs Single Groove Pulley, 20mm Fixed Bore 50mm Outer Diameter Aluminum Alloy Mechanical Belt Pulley with Hex Wrench for 6mm PU Round Belt

Package Content: 1Pcs Single Groove Pulley; Aperture Diameter: 20mm / 0.79"; Outer Diameter: 50mm / 1.97"; And applicable for 6mm PU round belt
Material: Our single groove pulley is made of aluminum alloy, with fine workmanship, high strength, firm and stable, and corrosion-resistant
Design: The groove design is conducive to the precise alignment between the belt and the pulley, reducing errors and improving transmission efficiency; it runs smoothly and rotates at high speed without shaking, effectively suppressing transmission noise and fluctuations and improving the stability of belt operation
Easy To Use: Compared with other transmission methods, the single groove pulley has a simple structure and is easy and quick to install. You only need to put the belt of the correct specification on the single groove pulley. Before placing an order, you need to measure the diameter of the shaft to be installed
Wide Application: Aluminum alloy single groove is suitable for motors, micro spindles, model transmission design, motor shaft transmission, etc

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Last update on 2025-07-20 / Affiliate links / Images from Amazon Product Advertising API

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