3M 20T~120T Synchronous Wheel Timing Belt Pulley With Step For 10 mm Width Belt
3M 20T~120T Synchronous Wheel Timing Belt Pulley With Step For 10 mm Width Belt
3M 20T~120T Synchronous Wheel Timing Belt Pulley With Step For 10 mm Width Belt
3M 20T~120T Synchronous Wheel Timing Belt Pulley With Step For 10 mm Width Belt
3M 20T~120T Synchronous Wheel Timing Belt Pulley With Step For 10 mm Width Belt
3M 20T~120T Synchronous Wheel Timing Belt Pulley With Step For 10 mm Width Belt
3M 20T~120T Synchronous Wheel Timing Belt Pulley With Step For 10 mm Width Belt
3M 20T~120T Synchronous Wheel Timing Belt Pulley With Step For 10 mm Width Belt
3M 20T~120T Synchronous Wheel Timing Belt Pulley With Step For 10 mm Width Belt
3M 20T~120T Synchronous Wheel Timing Belt Pulley With Step For 10 mm Width Belt
3M 20T~120T Synchronous Wheel Timing Belt Pulley With Step For 10 mm Width Belt
3M 20T~120T Synchronous Wheel Timing Belt Pulley With Step For 10 mm Width Belt
3M 20T~120T Synchronous Wheel Timing Belt Pulley With Step For 10 mm Width Belt
3M 20T~120T Synchronous Wheel Timing Belt Pulley With Step For 10 mm Width Belt
3M 20T~120T Synchronous Wheel Timing Belt Pulley With Step For 10 mm Width Belt
3M 20T~120T Synchronous Wheel Timing Belt Pulley With Step For 10 mm Width Belt
3M 20T~120T Synchronous Wheel Timing Belt Pulley With Step For 10 mm Width Belt
3M 20T~120T Synchronous Wheel Timing Belt Pulley With Step For 10 mm Width Belt
3M 20T~120T Synchronous Wheel Timing Belt Pulley With Step For 10 mm Width Belt
3M 20T~120T Synchronous Wheel Timing Belt Pulley With Step For 10 mm Width Belt
3M 20T~120T Synchronous Wheel Timing Belt Pulley With Step For 10 mm Width Belt
3M 20T~120T Synchronous Wheel Timing Belt Pulley With Step For 10 mm Width Belt
3M 20T~120T Synchronous Wheel Timing Belt Pulley With Step For 10 mm Width Belt
3M 20T~120T Synchronous Wheel Timing Belt Pulley With Step For 10 mm Width Belt
3M 20T~120T Synchronous Wheel Timing Belt Pulley With Step For 10 mm Width Belt
3M 20T~120T Synchronous Wheel Timing Belt Pulley With Step For 10 mm Width Belt
3M 20T~120T Synchronous Wheel Timing Belt Pulley With Step For 10 mm Width Belt
3M 20T~120T Synchronous Wheel Timing Belt Pulley With Step For 10 mm Width Belt
3M 20T~120T Synchronous Wheel Timing Belt Pulley With Step For 10 mm Width Belt
3M 20T~120T Synchronous Wheel Timing Belt Pulley With Step For 10 mm Width Belt
3M 20T~120T Synchronous Wheel Timing Belt Pulley With Step For 10 mm Width Belt
3M 20T~120T Synchronous Wheel Timing Belt Pulley With Step For 10 mm Width Belt
3M 20T~120T Synchronous Wheel Timing Belt Pulley With Step For 10 mm Width Belt
3M 20T~120T Synchronous Wheel Timing Belt Pulley With Step For 10 mm Width Belt
3M 20T~120T Synchronous Wheel Timing Belt Pulley With Step For 10 mm Width Belt
3M 20T~120T Synchronous Wheel Timing Belt Pulley With Step For 10 mm Width Belt
3M 20T~120T Synchronous Wheel Timing Belt Pulley With Step For 10 mm Width Belt
3M 20T~120T Synchronous Wheel Timing Belt Pulley With Step For 10 mm Width Belt
3M 20T~120T Synchronous Wheel Timing Belt Pulley With Step For 10 mm Width Belt
3M 20T~120T Synchronous Wheel Timing Belt Pulley With Step For 10 mm Width Belt
3M 20T~120T Synchronous Wheel Timing Belt Pulley With Step For 10 mm Width Belt
3M 20T~120T Synchronous Wheel Timing Belt Pulley With Step For 10 mm Width Belt
3M 20T~120T Synchronous Wheel Timing Belt Pulley With Step For 10 mm Width Belt
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3M 20T~120T Synchronous Wheel Timing Belt Pulley With Step For 10 mm Width Belt

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By HomeDIYer®

Price:
$9.63 USD
Stock:
In stock (500 units), ready to be shipped

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Description

3M BF-Type Timing Belt Pulley — Precision Stepped Pulleys for 10mm Belt Drives

When your CNC router, 3D printer, or linear automation system demands repeatable, slip-free motion, a mismatched or undersized pulley is the first point of failure. Makers, engineers, and small-workshop builders who rely on 3M pitch belt drives need a stepped pulley that locks the belt in place laterally and fits a wide range of shaft diameters without custom machining. These 3M BF-Type synchronous wheel timing belt pulleys are designed exactly for that use case.

Each pulley is machined from aluminum alloy and features a flanged step (BF-Type) that keeps the 10mm-wide timing belt tracking true under load. The 11mm groove width (nominally 11mm to accommodate the 10mm belt with clearance) accepts standard 3M pitch open or closed-loop timing belts. Tooth counts range from 20T to 120T, and bore diameters span 4mm to 25mm, covering the most common motor shaft and lead-screw sizes used in DIY automation.

Typical applications include desktop CNC routers requiring precise X/Y axis positioning, FDM 3D printer extruder and motion systems using 3M GT2-compatible belts, and small conveyor or pick-and-place automation rigs where consistent tooth engagement is critical. The stepped flange design also makes these pulleys a reliable choice for laser engravers and pen plotters where belt wander causes line-quality issues.

⚙️ Compatibility: Fits standard 3M pitch timing belts, 10mm width. Groove width: 11mm. Bore options: 4mm – 25mm (see variant selector). Verify your shaft diameter and belt pitch before ordering.

✅ Key Features of These 3M BF-Type Timing Belt Pulleys

🦷 Wide Tooth Range (20T – 120T)

Choose from 25 tooth-count options to dial in your drive ratio precisely — from high-speed 20T pinions to large 120T driven pulleys for torque multiplication.

🔩 BF-Type Stepped Flange Design

The integrated step flange on both sides of the groove keeps the 10mm belt centered and prevents lateral walk, reducing wear and maintaining positional accuracy.

📐 Broad Bore Selection (4mm – 25mm)

Available in bore diameters from 4mm to 25mm — including 6.35mm (1/4") and 12.7mm (1/2") imperial sizes — to fit NEMA stepper shafts, servo motors, and lead screws without adapters.

⚡ 3M Pitch for Low-Noise, High-Accuracy Drives

The 3mm tooth pitch delivers smooth, low-vibration power transmission suitable for motion-control applications where positional repeatability matters.

🏗️ Aluminum Alloy Construction

Lightweight yet rigid aluminum alloy body keeps rotational inertia low — critical for rapid direction changes in CNC and 3D printing applications.

🔄 Drop-In Replacement Geometry

Standard 3M BF-Type dimensions make these pulleys interchangeable with other 3M-pitch pulleys in existing belt drive systems, simplifying upgrades and repairs.

📐 Technical Specifications — 3M BF-Type Timing Belt Pulley

Belt Pitch 3M (3mm)
Belt Width Compatibility 10mm
Groove Width 11mm
Tooth Count Options 20T, 22T, 24T, 25T, 28T, 30T, 32T, 35T, 36T, 38T, 40T, 42T, 44T, 45T, 48T, 50T, 60T, 65T, 70T, 72T, 75T, 80T, 90T, 100T, 120T
Bore Diameter Range 4mm – 25mm (see variant options)
Pulley Type BF-Type (flanged step, both sides)
Material Aluminum alloy
Finish See variant options
Outer Diameter See variant options
Hub / Step Diameter See variant options
Weight See variant options
Quantity per Order 1 piece

❓ Frequently Asked Questions

How do I choose the right tooth count for my application?

The tooth count determines your drive ratio. Divide the driven pulley teeth by the driving pulley teeth to get the ratio. For example, a 20T motor pulley paired with a 60T driven pulley gives a 3:1 reduction, tripling torque while reducing speed by the same factor. For direct-drive or 1:1 setups, use matching tooth counts on both pulleys.

What bore size should I select for a NEMA 17 stepper motor?

Standard NEMA 17 stepper motors have a 5mm output shaft. Select the 5mm bore variant. If your motor has a D-cut shaft, you will need to add a set screw or use a shaft coupler — these pulleys include a set-screw hole on the hub for secure shaft locking.

Are these pulleys compatible with GT2 or HTD 3M belts?

These pulleys are designed for standard 3M trapezoidal-tooth timing belts. GT2 belts use a different (curvilinear) tooth profile and are not directly interchangeable. HTD 3M belts share the 3mm pitch but use a rounded tooth profile — compatibility depends on tooth depth tolerance. For best results, pair these pulleys with standard 3M trapezoidal timing belts.

Will the flanged step prevent the belt from slipping off?

Yes. The BF-Type designation means both sides of the pulley groove have a raised flange (step), which physically constrains the belt laterally. This is especially important on long belt runs or high-speed applications where belt wander is common with unflanged pulleys.

Can I use these pulleys in a vertical belt drive orientation?

Yes. The flanged step design is particularly well-suited for vertical or angled belt runs where gravity would otherwise cause the belt to drift off an unflanged pulley. Ensure proper belt tension is maintained for reliable engagement in vertical configurations.

How do I determine the correct belt length to pair with these pulleys?

Belt length depends on center distance between pulleys and the tooth counts of both pulleys. Use the standard timing belt length formula: L = 2C + π(D1 + D2)/2 + (D2 – D1)²/(4C), where C is center distance and D1/D2 are pitch diameters. Pitch diameter = (Tooth Count × Pitch) / π. For 3M pitch: pitch diameter (mm) = Tooth Count × 3 / π.

What is the difference between BF-Type and B-Type pulleys?

B-Type pulleys have a flange on one side only, while BF-Type pulleys have flanges (steps) on both sides of the groove. BF-Type provides superior belt retention and is recommended for applications with vibration, variable loads, or where the belt cannot be guided by a tensioner on both sides.

🛒 Select your Gears (tooth count) and Groove width / Bore size above, then add to cart.

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