3M Timing Pulley 12-20 Teeth Bore 3-14mm Synchronous Wheel for 10mm Width Belt
3M Timing Pulley 12-20 Teeth Bore 3-14mm Synchronous Wheel for 10mm Width Belt
3M Timing Pulley 12-20 Teeth Bore 3-14mm Synchronous Wheel for 10mm Width Belt
3M Timing Pulley 12-20 Teeth Bore 3-14mm Synchronous Wheel for 10mm Width Belt
3M Timing Pulley 12-20 Teeth Bore 3-14mm Synchronous Wheel for 10mm Width Belt
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3M Timing Pulley 12-20 Teeth Bore 3-14mm Synchronous Wheel for 10mm Width Belt3M Timing Pulley 12-20 Teeth Bore 3-14mm Synchronous Wheel for 10mm Width Belt3M Timing Pulley 12-20 Teeth Bore 3-14mm Synchronous Wheel for 10mm Width Belt3M Timing Pulley 12-20 Teeth Bore 3-14mm Synchronous Wheel for 10mm Width Belt3M Timing Pulley 12-20 Teeth Bore 3-14mm Synchronous Wheel for 10mm Width Belt

3M Timing Pulley 12-20 Teeth Bore 3-14mm Synchronous Wheel for 10mm Width Belt

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Price:
$10.00 USD
Stock:
In stock (500 units), ready to be shipped

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Description

3M Timing Pulley 12–20 Teeth — Precise Synchronous Drive for DIY Automation

When your CNC router skips steps or your 3D printer loses position mid-print, the culprit is often a mismatched or worn timing pulley. These 3M timing belt pulleys are engineered for makers, hobbyists, and small-workshop builders who need repeatable, slip-free motion without sourcing industrial-grade parts at industrial prices.

Each pulley is machined from aluminum alloy with a natural silver finish. The tooth profile follows the 3M (3mm pitch) standard, with a fixed tooth width of 11mm (~0.43 in) and a bore diameter ranging from 3mm to 14mm (~0.12–0.55 in) depending on the variant selected. Tooth counts span 12T through 20T, giving you a range of gear ratios for your drive system.

Typical use cases include DIY CNC gantry drives requiring a 3M timing pulley with keyway bore, 3D printer extruder and axis drives needing a synchronous wheel for 10mm belt, and small automation conveyor systems where a 12–20 tooth 3M pulley provides the right speed reduction.

⚙️ Compatibility: Designed for 3M pitch (3mm tooth pitch) timing belts with 10mm belt width. Verify your shaft diameter matches the bore option before ordering.

✅ Key Features of These 3M Timing Belt Pulleys

🦷
12–20 Tooth Range

Seven tooth-count options (12T, 14T, 15T, 16T, 17T, 18T, 20T) let you dial in the exact gear ratio your drive system needs.

📐
3M Pitch Standard

3mm tooth pitch matches standard 3M timing belts, ensuring positive engagement and zero-slip synchronous motion.

🔩
Wide Bore Selection

Bore diameters from 3mm to 14mm (including 6.35mm / 1/4" and 12.7mm / 1/2" imperial sizes) cover most stepper and servo motor shaft sizes.

📏
11mm Tooth Width

Matches 10mm wide 3M belts with a 1mm flange overhang on each side to keep the belt tracking straight under load.

🏭
Aluminum Alloy Construction

Lightweight yet rigid aluminum alloy body reduces rotational inertia while maintaining dimensional stability across typical operating temperatures.

📦
Flexible Pack Quantities

Available in 1, 2, 5, or 10-piece packs — order a single prototype unit or stock up for a multi-axis build in one purchase.

📐 Technical Specifications — 3M Timing Pulley

Belt Pitch 3M (3mm)
Tooth Count 12T / 14T / 15T / 16T / 17T / 18T / 20T (see variant options)
Tooth Width 11mm (0.43 in)
Compatible Belt Width 10mm
Bore Diameter 3 / 4 / 5 / 6 / 6.35 / 7 / 8 / 10 / 12 / 12.7 / 14mm (see variant options)
Material Aluminum alloy
Finish Natural / silver anodized
Outer Diameter See variant options
Keyway See variant options
Set Screw See variant options
Pack Quantity 1 / 2 / 5 / 10 pcs (see variant options)

❓ Frequently Asked Questions

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

The tooth count determines your drive ratio. Divide the driven pulley teeth by the driving pulley teeth to get the reduction ratio. For a 1:1 ratio on both ends of a belt loop, use matching tooth counts. For speed reduction, use a smaller pulley on the motor shaft and a larger one on the driven shaft. Common choices for 3D printers and CNC machines are 16T–20T on the motor side.

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

Measure your motor shaft diameter with a caliper before ordering. Common stepper motor shaft sizes are 5mm (NEMA 17), 6.35mm (1/4" — common on NEMA 23), and 8mm (larger NEMA 23/34). The 6.35mm and 12.7mm bore options are imperial equivalents included for compatibility with US-standard motors.

Will this pulley fit a 3M timing belt I already have?

Yes, provided your belt has a 3mm tooth pitch (3M standard) and is 10mm wide. The pulley tooth width is 11mm, which provides a 0.5mm flange on each side to guide the belt. Do not use with GT2, HTD, or other pitch standards — the tooth profiles are not interchangeable.

Is the bore pre-finished or does it need machining?

The bore is finished to the diameter listed in the variant. For variants with a keyway, the keyway slot is pre-cut. If your shaft requires a set screw, check the variant description or contact us to confirm whether a set screw hole is included. No additional machining is required for standard round shafts matching the listed bore diameter.

How strong is the aluminum alloy — can it handle high-torque applications?

The aluminum alloy construction is suitable for light-to-medium duty automation, 3D printing, and CNC routing applications. For high-torque industrial drives (e.g., heavy conveyor systems or servo drives above ~5 Nm continuous), consider steel pulleys instead. For typical DIY and maker applications these pulleys perform reliably within normal operating loads.

Does aluminum corrode — is this suitable for outdoor or humid environments?

Aluminum naturally forms a thin oxide layer that resists mild corrosion. For occasional exposure to humidity (e.g., a garage workshop), these pulleys perform well without additional treatment. For continuous outdoor exposure or salt-spray environments, consider applying a light coat of corrosion-inhibiting lubricant or selecting a stainless steel alternative.

Can I buy just one pulley to test before ordering in bulk?

Yes. Each variant is available in a 1-piece quantity so you can verify fit and compatibility before committing to a 5 or 10-pack. Multi-pack options offer a lower per-unit cost for production builds or multi-axis machines.

🛒 Select your Tooth count, Bore Diameter, and Pack Quantity above, then add to cart.

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