3M Timing Belt Pulley 12T-120T Synchronous Wheel Sprocket For 15mm Width Belt
3M Timing Belt Pulley 12T-120T Synchronous Wheel Sprocket For 15mm Width Belt
3M Timing Belt Pulley 12T-120T Synchronous Wheel Sprocket For 15mm Width Belt
3M Timing Belt Pulley 12T-120T Synchronous Wheel Sprocket For 15mm Width Belt
3M Timing Belt Pulley 12T-120T Synchronous Wheel Sprocket For 15mm Width Belt
3M Timing Belt Pulley 12T-120T Synchronous Wheel Sprocket For 15mm Width Belt
3M Timing Belt Pulley 12T-120T Synchronous Wheel Sprocket For 15mm Width Belt
3M Timing Belt Pulley 12T-120T Synchronous Wheel Sprocket For 15mm Width Belt
3M Timing Belt Pulley 12T-120T Synchronous Wheel Sprocket For 15mm Width Belt
3M Timing Belt Pulley 12T-120T Synchronous Wheel Sprocket For 15mm Width Belt
3M Timing Belt Pulley 12T-120T Synchronous Wheel Sprocket For 15mm Width Belt
3M Timing Belt Pulley 12T-120T Synchronous Wheel Sprocket For 15mm Width Belt
3M Timing Belt Pulley 12T-120T Synchronous Wheel Sprocket For 15mm Width Belt
3M Timing Belt Pulley 12T-120T Synchronous Wheel Sprocket For 15mm Width Belt
3M Timing Belt Pulley 12T-120T Synchronous Wheel Sprocket For 15mm Width Belt
3M Timing Belt Pulley 12T-120T Synchronous Wheel Sprocket For 15mm Width Belt
3M Timing Belt Pulley 12T-120T Synchronous Wheel Sprocket For 15mm Width Belt
3M Timing Belt Pulley 12T-120T Synchronous Wheel Sprocket For 15mm Width Belt
3M Timing Belt Pulley 12T-120T Synchronous Wheel Sprocket For 15mm Width Belt
3M Timing Belt Pulley 12T-120T Synchronous Wheel Sprocket For 15mm Width Belt
3M Timing Belt Pulley 12T-120T Synchronous Wheel Sprocket For 15mm Width Belt
3M Timing Belt Pulley 12T-120T Synchronous Wheel Sprocket For 15mm Width Belt
3M Timing Belt Pulley 12T-120T Synchronous Wheel Sprocket For 15mm Width Belt
3M Timing Belt Pulley 12T-120T Synchronous Wheel Sprocket For 15mm Width Belt
3M Timing Belt Pulley 12T-120T Synchronous Wheel Sprocket For 15mm Width Belt
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3M Timing Belt Pulley 12T-120T Synchronous Wheel Sprocket For 15mm Width Belt

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$2.98 USD
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In stock (500 units), ready to be shipped

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Description

3M Timing Belt Pulley — Precision Synchronous Drive for 15mm Width Belts

When your CNC router skips steps, your 3D printer loses position, or your DIY conveyor slips under load, the culprit is almost always a mismatched or worn drive pulley. These 3M pitch timing belt pulleys are engineered for makers, small-workshop builders, and automation hobbyists who need repeatable, slip-free motion without the cost of industrial-grade components.

Each 3M timing belt pulley is machined to accept a 15mm wide synchronous belt with a 3mm pitch (GT2/3M profile). The tooth count ranges from 12T to 120T, and bore options span 4mm to 20mm (approximately 0.16 in to 0.79 in), covering the most common motor shaft and lead-screw diameters used in hobby and light-industrial builds. The pulley body is typically aluminum alloy with a natural or anodized finish, keeping rotating mass low while maintaining dimensional accuracy.

Typical use cases include CNC router X/Y axis drives where 3M timing belt pulleys deliver consistent step-to-distance ratios, open-loop 3D printer extruder and motion systems requiring low-backlash synchronous drive, and DIY pick-and-place or conveyor automation projects needing a compact, lightweight sprocket with a wide bore selection.

⚙️ Compatibility: Designed for 15mm wide, 3M pitch (3mm tooth pitch) synchronous timing belts. Verify your belt width and pitch before ordering. Bore sizes from 4mm to 20mm — select your shaft diameter from the variant options above.

✅ Key Features of These 3M Timing Belt Pulleys

🦷
Wide Tooth Count Range

Available from 12T to 120T, giving you precise gear-ratio flexibility for speed reduction or torque multiplication in your drive system.

🔩
Multiple Bore Options

Bore diameters from 4mm to 20mm (0.16"–0.79") accommodate the most common stepper motor, servo, and shaft sizes used in CNC and automation builds.

📐
3M Pitch Profile

3mm tooth pitch matches standard 3M synchronous belts, ensuring positive engagement, zero slip, and accurate linear positioning in open-loop systems.

⚖️
Lightweight Alloy Construction

Aluminum alloy body keeps rotational inertia low — critical for high-acceleration CNC and 3D printer axes where motor torque is limited.

🎯
Machined Tooth Accuracy

Teeth are machined to consistent depth and profile, reducing belt wear and maintaining pitch accuracy over extended duty cycles in workshop automation.

🔄
Drop-In Replacement Sizing

Standard 3M tooth geometry means these pulleys are interchangeable with other 3M-profile sprockets, simplifying upgrades and repairs on existing machines.

📐 Technical Specifications — 3M Timing Belt Pulley

Belt Pitch 3M (3mm)
Belt Width Compatibility 15mm
Tooth Count (Types) 12T, 15T, 16T, 18T, 20T, 24T, 25T, 30T, 35T, 36T, 40T, 45T, 48T, 50T, 55T, 60T, 65T, 70T, 72T, 80T, 90T, 100T, 120T
Bore Diameter Options 4mm, 5mm, 6mm, 6.35mm, 8mm, 10mm, 12mm, 12.7mm, 14mm, 15mm, 16mm, 17mm, 19mm, 20mm
Outer Diameter (OD) See variant options
Hub Material Aluminum alloy (typically 6061 or equivalent)
Finish See variant options
Set Screw See variant options
Flange Typically flanged on both sides to retain 15mm belt
Application CNC routers, 3D printers, conveyor systems, DIY automation

❓ Frequently Asked Questions

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

The tooth count determines your drive ratio. Divide the driven pulley tooth count by the driver pulley tooth count to get your speed reduction ratio. For example, a 20T driver paired with a 40T driven pulley gives a 2:1 reduction — halving speed and doubling torque. For CNC and 3D printers, matching the tooth count to your steps-per-mm calculation is essential for accurate positioning.

What bore size should I select for my stepper motor shaft?

Measure your motor shaft diameter with calipers before ordering. Common NEMA 17 stepper motors use a 5mm shaft; NEMA 23 motors typically use 6.35mm (1/4") or 8mm shafts; larger NEMA 34 motors often use 12mm or 14mm shafts. Select the bore that matches your shaft exactly — a loose fit will cause slippage and positioning errors.

Are these pulleys compatible with GT2 belts?

These pulleys use a 3M pitch profile (3mm tooth pitch). While GT2 belts also have a 2mm pitch, the 3M profile is a different standard. Please confirm your belt is specifically a 3M synchronous belt (3mm pitch, 15mm wide) before purchasing. Using a mismatched belt profile will cause poor engagement and accelerated wear.

How strong are these pulleys — can they handle continuous duty?

The aluminum alloy construction provides adequate strength for light-to-medium duty applications such as CNC routing, 3D printing, and small conveyor systems. For heavy industrial loads or high-speed continuous operation, verify the torque rating against your application requirements. The machined tooth profile distributes belt load evenly, reducing stress concentration at individual teeth.

Will these pulleys corrode or oxidize over time?

Aluminum alloy naturally forms a thin oxide layer that provides moderate corrosion resistance in typical indoor workshop environments. For humid or outdoor environments, consider applying a light coat of dry lubricant or corrosion inhibitor to the bore and hub area. The tooth flanks should remain dry for optimal belt grip.

Can I use these pulleys on both the motor shaft and the idler/driven shaft?

Yes. These pulleys can be used as driver pulleys (mounted on the motor shaft) or driven pulleys (mounted on the output shaft or lead screw). Simply select the appropriate tooth count and bore for each position. For idler applications where the pulley spins freely, you will need to add a bearing — the pulley bore alone does not include a bearing.

What is the difference between 3M12T and 3M120T in terms of physical size?

The number after the "T" indicates the tooth count. More teeth means a larger outer diameter. A 3M12T pulley has a very small OD (approximately 11–12mm), making it suitable for compact, high-speed motor shafts. A 3M120T pulley has a much larger OD (approximately 115mm), suited for large speed-reduction ratios or long belt spans. Refer to the variant options for exact OD dimensions.

🛒 Select your Type (tooth count) and Bore diameter above, then add to cart.

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