L-Type 10T-30T Timing Belt Pulley Pitch 9.525mm With Keyway CNC Drive Width 21mm
L-Type 10T-30T Timing Belt Pulley Pitch 9.525mm With Keyway CNC Drive Width 21mm
L-Type 10T-30T Timing Belt Pulley Pitch 9.525mm With Keyway CNC Drive Width 21mm
L-Type 10T-30T Timing Belt Pulley Pitch 9.525mm With Keyway CNC Drive Width 21mm
L-Type 10T-30T Timing Belt Pulley Pitch 9.525mm With Keyway CNC Drive Width 21mm
L-Type 10T-30T Timing Belt Pulley Pitch 9.525mm With Keyway CNC Drive Width 21mm
L-Type 10T-30T Timing Belt Pulley Pitch 9.525mm With Keyway CNC Drive Width 21mm
L-Type 10T-30T Timing Belt Pulley Pitch 9.525mm With Keyway CNC Drive Width 21mm
L-Type 10T-30T Timing Belt Pulley Pitch 9.525mm With Keyway CNC Drive Width 21mm
L-Type 10T-30T Timing Belt Pulley Pitch 9.525mm With Keyway CNC Drive Width 21mm
L-Type 10T-30T Timing Belt Pulley Pitch 9.525mm With Keyway CNC Drive Width 21mm
L-Type 10T-30T Timing Belt Pulley Pitch 9.525mm With Keyway CNC Drive Width 21mm
L-Type 10T-30T Timing Belt Pulley Pitch 9.525mm With Keyway CNC Drive Width 21mm
L-Type 10T-30T Timing Belt Pulley Pitch 9.525mm With Keyway CNC Drive Width 21mm
L-Type 10T-30T Timing Belt Pulley Pitch 9.525mm With Keyway CNC Drive Width 21mm
L-Type 10T-30T Timing Belt Pulley Pitch 9.525mm With Keyway CNC Drive Width 21mm
L-Type 10T-30T Timing Belt Pulley Pitch 9.525mm With Keyway CNC Drive Width 21mm
L-Type 10T-30T Timing Belt Pulley Pitch 9.525mm With Keyway CNC Drive Width 21mm
L-Type 10T-30T Timing Belt Pulley Pitch 9.525mm With Keyway CNC Drive Width 21mm
L-Type 10T-30T Timing Belt Pulley Pitch 9.525mm With Keyway CNC Drive Width 21mm
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L-Type 10T-30T Timing Belt Pulley Pitch 9.525mm With Keyway CNC Drive Width 21mmL-Type 10T-30T Timing Belt Pulley Pitch 9.525mm With Keyway CNC Drive Width 21mmL-Type 10T-30T Timing Belt Pulley Pitch 9.525mm With Keyway CNC Drive Width 21mmL-Type 10T-30T Timing Belt Pulley Pitch 9.525mm With Keyway CNC Drive Width 21mmL-Type 10T-30T Timing Belt Pulley Pitch 9.525mm With Keyway CNC Drive Width 21mmL-Type 10T-30T Timing Belt Pulley Pitch 9.525mm With Keyway CNC Drive Width 21mmL-Type 10T-30T Timing Belt Pulley Pitch 9.525mm With Keyway CNC Drive Width 21mmL-Type 10T-30T Timing Belt Pulley Pitch 9.525mm With Keyway CNC Drive Width 21mmL-Type 10T-30T Timing Belt Pulley Pitch 9.525mm With Keyway CNC Drive Width 21mmL-Type 10T-30T Timing Belt Pulley Pitch 9.525mm With Keyway CNC Drive Width 21mmL-Type 10T-30T Timing Belt Pulley Pitch 9.525mm With Keyway CNC Drive Width 21mmL-Type 10T-30T Timing Belt Pulley Pitch 9.525mm With Keyway CNC Drive Width 21mmL-Type 10T-30T Timing Belt Pulley Pitch 9.525mm With Keyway CNC Drive Width 21mmL-Type 10T-30T Timing Belt Pulley Pitch 9.525mm With Keyway CNC Drive Width 21mmL-Type 10T-30T Timing Belt Pulley Pitch 9.525mm With Keyway CNC Drive Width 21mmL-Type 10T-30T Timing Belt Pulley Pitch 9.525mm With Keyway CNC Drive Width 21mmL-Type 10T-30T Timing Belt Pulley Pitch 9.525mm With Keyway CNC Drive Width 21mmL-Type 10T-30T Timing Belt Pulley Pitch 9.525mm With Keyway CNC Drive Width 21mmL-Type 10T-30T Timing Belt Pulley Pitch 9.525mm With Keyway CNC Drive Width 21mmL-Type 10T-30T Timing Belt Pulley Pitch 9.525mm With Keyway CNC Drive Width 21mm

L-Type 10T-30T Timing Belt Pulley Pitch 9.525mm With Keyway CNC Drive Width 21mm

HomeDIYer
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By HomeDIYer®

Price:
$7.36 USD
Stock:
In stock (500 units), ready to be shipped

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Description

L-Type Timing Belt Pulley 9.525mm Pitch — Precision CNC Drive Component With Keyway

When a slipping or misaligned drive pulley is costing you accuracy on your CNC router, 3D printer, or automation rig, the root cause is almost always a pulley that was not machined to spec. Engineers and makers who demand repeatable positioning need an L-type timing belt pulley that holds its tooth profile under load — not one that wears out after a few hundred hours.

These L-type pulleys feature a 9.525mm (3/8 in) pitch tooth profile and a 21mm (0.827 in) belt contact width. The bore range spans 8 mm to 30 mm (0.315 in – 1.181 in), and each pulley ships with a machined keyway sized to match the bore — from 3×1.4 mm on smaller bores up to 8×3.3 mm on the largest. Tooth counts run from 10T through 30T, giving pitch diameters of approximately 30 mm to 91 mm (1.18 in – 3.58 in). Material is typically aluminium alloy with an anodised or natural finish; confirm finish via variant options.

Typical use cases include CNC gantry drives requiring low-backlash linear motion, stepper-motor timing systems in laser cutters and plasma tables, and conveyor indexing mechanisms where consistent belt engagement is critical for throughput accuracy.

⚙️ Compatible with: Standard L-series (3/8 in pitch) synchronous timing belts — open-end and endless. Verify belt width ≤ 21 mm for full tooth engagement.

✅ Key Features of These L-Type Timing Belt Pulleys

📐
9.525 mm (3/8 in) L-Series Pitch

Matches the industry-standard L-type tooth profile for drop-in compatibility with L-series synchronous belts used across CNC and automation platforms.

🔩
Machined Keyway Included

Every pulley is bored and keyway-cut to match the selected bore size — 3×1.4 mm, 4×1.8 mm, 5×2.3 mm, 6×2.8 mm, or 8×3.3 mm — for positive shaft engagement without slippage.

📏
21 mm Drive Width

The 21 mm (0.827 in) belt contact face provides a stable, even load distribution across the belt width, reducing edge wear and extending belt service life.

🎯
Wide Tooth Count Range: 10T – 30T

Fifteen tooth-count options let you dial in the exact gear ratio and pitch diameter your drive system requires, from compact 10-tooth sprockets to larger 30-tooth pulleys.

🔄
Broad Bore Selection: 8 mm – 30 mm

Sixteen bore sizes cover the most common motor and shaft diameters used in NEMA stepper motors, servo motors, and standard metric shafting — no custom machining needed for most builds.

🏗️
CNC-Machined Tooth Profile

Tooth geometry is machined to L-series standards, ensuring consistent belt mesh, low noise, and accurate positioning in closed-loop and open-loop motion control systems.

📐 Technical Specifications — L-Type Timing Belt Pulley

Belt Type L-Series (3/8 in pitch)
Tooth Pitch 9.525 mm (3/8 in)
Drive Width 21 mm (0.827 in)
Number of Teeth 10T, 12T, 14T, 15T, 16T, 17T, 18T, 19T, 20T, 22T, 24T, 25T, 26T, 28T, 30T
Bore Diameter 8 mm, 10 mm, 12 mm, 12.7 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, 19 mm, 20 mm, 22 mm, 24 mm, 25 mm, 28 mm, 30 mm
Keyway Size 3×1.4 mm / 4×1.8 mm / 5×2.3 mm / 6×2.8 mm / 8×3.3 mm (matched to bore)
Approximate Pitch Diameter Range ~30 mm – ~91 mm (10T – 30T)
Material See variant options
Surface Finish See variant options
Quantity per Order 1 piece

❓ Frequently Asked Questions

How do I choose the right number of teeth for my drive system?

The tooth count determines the pitch diameter and, combined with your motor's RPM, the linear or rotational speed of the driven axis. A smaller tooth count (e.g., 10T) gives a smaller pitch diameter and higher belt tension per unit of torque, while a larger count (e.g., 30T) spreads load over more teeth. Match the tooth count to your desired speed ratio and the minimum bend radius your belt allows. For most CNC gantry builds, 16T–20T is a common starting point.

What bore size should I select for a NEMA 23 stepper motor?

Standard NEMA 23 stepper motors typically have a 6.35 mm (1/4 in) or 8 mm output shaft. Select the 8 mm bore with the 3×1.4 mm keyway option for a direct fit on an 8 mm shaft. If your motor has a 6.35 mm shaft, you may need a shaft adapter or a custom bore — contact us to confirm availability.

Is the keyway pre-cut, or do I need to machine it myself?

The keyway is fully machined at the factory and matched to the bore size you select at checkout. No additional machining is required. Each variant listing specifies the keyway dimensions (e.g., 4×1.8 mm) so you can verify compatibility with your shaft key before ordering.

Will this pulley work with any L-series timing belt?

Yes — this pulley is designed for standard L-series (3/8 in pitch, 9.525 mm) synchronous timing belts. It is compatible with both open-end and endless L-series belts up to 21 mm wide. Belts narrower than 21 mm will also work but will not use the full tooth face. Belts wider than 21 mm are not recommended as they will overhang the pulley flange.

How strong is the pulley under continuous load?

Load capacity depends on the tooth count, bore size, shaft fit, and the belt tension in your specific application. The machined keyway provides a positive mechanical connection that resists rotational slippage under normal CNC and automation loads. For high-torque or high-cycle applications, ensure the set screw (if used) is properly torqued and consider using a locking collar for additional axial retention. Specific load ratings are not published; contact us if you have a demanding application.

Is this pulley corrosion-resistant for outdoor or humid environments?

The base material and surface finish vary by variant — see variant options for confirmed material details. Aluminium alloy pulleys with an anodised finish offer moderate corrosion resistance suitable for indoor and lightly humid environments. For harsh outdoor or washdown environments, consider additional protective coatings or contact us to confirm the finish on your specific variant before ordering.

Can I use this pulley as an idler (without a shaft keyway)?

These pulleys are designed as drive pulleys with a machined keyway for shaft engagement. Using them as idlers is possible if you mount them on a bearing-supported shaft and do not rely on the keyway for drive torque. However, a dedicated idler pulley (smooth bore, flanged) is generally a better choice for tensioning applications. Contact us if you need a flanged idler variant.

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

 

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