S2M 22T-80T Timing Belt Pulley Pitch 2mm With Step/Keyway Drive Pulley Width 7mm
S2M 22T-80T Timing Belt Pulley Pitch 2mm With Step/Keyway Drive Pulley Width 7mm
S2M 22T-80T Timing Belt Pulley Pitch 2mm With Step/Keyway Drive Pulley Width 7mm
S2M 22T-80T Timing Belt Pulley Pitch 2mm With Step/Keyway Drive Pulley Width 7mm
S2M 22T-80T Timing Belt Pulley Pitch 2mm With Step/Keyway Drive Pulley Width 7mm
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S2M 22T-80T Timing Belt Pulley Pitch 2mm With Step/Keyway Drive Pulley Width 7mmS2M 22T-80T Timing Belt Pulley Pitch 2mm With Step/Keyway Drive Pulley Width 7mmS2M 22T-80T Timing Belt Pulley Pitch 2mm With Step/Keyway Drive Pulley Width 7mmS2M 22T-80T Timing Belt Pulley Pitch 2mm With Step/Keyway Drive Pulley Width 7mmS2M 22T-80T Timing Belt Pulley Pitch 2mm With Step/Keyway Drive Pulley Width 7mm

S2M 22T-80T Timing Belt Pulley Pitch 2mm With Step/Keyway Drive Pulley Width 7mm

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$10.54 USD
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In stock (500 units), ready to be shipped

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Description

S2M Timing Belt Pulleys 22T–80T — Precise 2mm Pitch Drive for DIY Automation

When your motion-control project demands repeatable, slip-free power transfer, a mismatched or poorly machined pulley is the first thing that derails your build. Hobbyists, makers, and small-workshop engineers who rely on synchronous belt drives need a pulley that holds tight tolerances across every tooth — and that's exactly what these S2M timing belt pulleys deliver.

Each pulley is machined to the S2M synchronous belt standard with a 2mm pitch and a 7mm (approximately 0.28 in) belt-contact width. The hub diameter is 7mm wide, and bore options span 8mm to 25mm (roughly 0.31 in to 0.98 in) to suit a wide range of shaft sizes. Tooth counts run from 22T through 80T, giving you fine control over your drive ratio. Two hub styles are available: K-type (standard stepped hub) and BF-type (flanged hub for lateral belt retention). Keyway slots — 3×1.4mm, 4×1.8mm, 5×2.3mm, 6×2.8mm, or 8×3.3mm — are pre-cut to match standard shaft keyways and prevent rotational slip under load.

These S2M pulleys are well-suited for CNC router axis drives, 3D printer extruder and motion systems, small conveyor belt assemblies, and lightweight robotic arm joints where a synchronous 2mm-pitch belt drive is required. The flanged BF-type variant is especially useful in open-frame builds where belt tracking without side guides is a priority.

⚙️ Compatible with: S2M synchronous timing belts, 2mm pitch, 6–7mm belt width. Verify bore diameter and keyway dimensions against your shaft before ordering.

✅ Key Features of These S2M Timing Belt Pulleys

🔩 Wide Tooth Count Range

Available from 22T to 80T, enabling flexible gear-ratio selection for low-speed torque or high-speed positioning applications.

📐 2mm S2M Pitch Standard

Machined to the S2M synchronous belt profile — 2mm tooth pitch, 7mm belt-contact width — for direct compatibility with standard S2M belts.

🔧 Pre-Cut Keyway Slots

Keyway options (3×1.4mm through 8×3.3mm) are precision-cut to prevent shaft slip under load, eliminating the need for post-purchase machining.

🔄 K-Type & BF-Type Hub Styles

Choose the standard stepped K-type hub for enclosed drives, or the flanged BF-type for open-frame builds that need passive belt tracking without side guides.

📏 Multiple Bore Sizes

Bore diameters from 8mm to 25mm (0.31–0.98 in) cover a broad range of motor and drive shafts commonly used in DIY automation and CNC projects.

🏗️ Stepped Hub Design

The stepped hub profile provides a positive axial stop for belt alignment and simplifies assembly on both single-shaft and tandem-shaft drive configurations.

📐 Technical Specifications — S2M Timing Belt Pulley

Belt Profile S2M (Synchronous, 2mm pitch)
Pitch 2mm
Belt Width (hub) 7mm (~0.28 in)
Tooth Count 22T – 80T (see variant options)
Bore Diameter 8mm – 25mm (see variant options)
Keyway Size 3×1.4mm / 4×1.8mm / 5×2.3mm / 6×2.8mm / 8×3.3mm (see variant options)
Hub Style K-type (stepped) / BF-type (flanged) (see variant options)
Material See variant options
Finish See variant options
Quantity per Order 1 piece

❓ Frequently Asked Questions

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

The tooth count determines your drive ratio. Divide the driven pulley's tooth count by the driving pulley's tooth count to get the ratio. For example, a 40T driven pulley paired with a 20T drive pulley gives a 2:1 reduction. Higher tooth counts on the drive pulley increase output speed; lower counts increase torque. Select your variant above based on the ratio your project requires.

What is the difference between K-type and BF-type pulleys?

K-type pulleys have a standard stepped hub without flanges — the belt is retained by the drive system's side guides or tensioner. BF-type pulleys have integrated flanges on both sides of the tooth profile that physically contain the belt laterally, making them ideal for open-frame or unsupported belt runs where side guides are not practical.

How do I select the correct bore and keyway size?

Measure your shaft diameter precisely with calipers and select the matching bore size. Then check your shaft's existing keyway dimensions (width × depth) and choose the corresponding keyway option. Common pairings: 8–10mm shafts typically use 3×1.4mm keyways; 12mm shafts use 4×1.8mm; 14–15mm shafts use 5×2.3mm; 18–20mm shafts use 6×2.8mm; 25mm shafts use 8×3.3mm.

Are these pulleys compatible with standard S2M timing belts?

Yes. These pulleys are machined to the S2M synchronous belt standard — 2mm pitch, designed for 6–7mm wide S2M belts. Ensure your belt is also rated S2M with a matching pitch. Do not use with GT2, HTD, or other belt profiles, as tooth geometry differs and will cause skipping or premature wear.

What load or torque can these pulleys handle?

The load capacity depends on the specific material, tooth count, belt tension, and operating speed of your system. S2M pulleys in this size range are generally suited for light-to-medium duty applications such as CNC positioning axes, 3D printer motion systems, and small conveyor drives. For heavy industrial loads, consult your belt manufacturer's load tables and confirm with us before ordering.

Can I use these pulleys without a keyway (press-fit or set-screw only)?

The pulleys in this listing include pre-cut keyways. If your shaft does not have a keyway, you can still use the pulley by omitting the key and securing with a set screw against the shaft flat or using a shaft collar — however, this reduces torque transmission reliability. For keyway-free applications, contact us to confirm suitability for your specific load conditions.

What is the hub width / overall pulley width?

The belt-contact (tooth) width is 7mm. The overall hub width including the stepped section is wider and varies slightly by tooth count. If you need the exact overall hub length for your assembly clearance, please contact us with your specific tooth count and we can provide the dimension.

🛒 Select your Number of Teeth & Bore, Keyway, and Type above, then add to cart.

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