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When a slipping or mismatched pulley causes your belt drive to lose sync, the entire machine suffers — whether you're building a CNC router, a 3D printer, or a custom conveyor. Engineers, makers, and machine builders who need a reliable, dimensionally accurate L-type timing belt pulley will find this series covers the widest range of tooth counts and bore sizes in a single listing.
Each pulley is machined from 45# carbon steel, offering a solid balance of strength and machinability. The belt-contact width is 27mm, matching standard L-type (3/8") timing belts with a pitch of 9.525mm (0.375 in). Tooth counts run from 10T to 30T, and bore diameters range from 8mm to 28mm (approximately 0.31 in to 1.10 in), with a pre-cut keyway included on every variant to lock the pulley securely to your shaft.
Typical applications include DIY CNC machine X/Y axis drives, desktop laser engraver feed systems, and custom automation conveyor belt pulleys — anywhere a synchronous L-pitch belt drive is required for repeatable, slip-free motion.
| Belt Type | L-type (3/8" pitch) |
|---|---|
| Pitch | 9.525mm (0.375 in) |
| Belt Width (Face Width) | 27mm |
| Number of Teeth | 10T, 12T, 14T, 15T, 16T, 17T, 18T, 19T, 20T, 22T, 24T, 25T, 26T, 28T, 30T |
| Bore Diameter | 8mm, 10mm, 12mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 22mm, 24mm, 25mm, 28mm |
| Keyway Dimensions | 3×1.4mm / 4×1.8mm / 5×2.3mm / 6×2.8mm / 8×3.3mm (varies by bore) |
| Material | 45# Carbon Steel |
| Quantity per Order | 1 piece |
| Outer Diameter | See variant options |
| Hub Diameter | See variant options |
| Surface Finish | See variant options |
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 20T driver paired with a 10T driven pulley gives a 2:1 speed increase. Match the tooth count to your required RPM and torque output — smaller tooth counts produce higher speed, larger tooth counts produce more torque at lower speed.
Measure your motor or drive shaft diameter with a caliper. Select the bore size that matches exactly — for example, a 10mm shaft requires the 10mm bore variant. The pre-cut keyway is sized to match the bore, so no additional machining is needed for standard shaft-keyway combinations.
Keyway dimensions are matched to bore size following standard DIN 6885 conventions: 8mm bore → 3×1.4mm keyway; 10–12mm bore → 3×1.4mm or 4×1.8mm; 14–17mm bore → 5×2.3mm; 18–20mm bore → 6×2.8mm; 22–28mm bore → 8×3.3mm. The exact keyway for your selected variant is shown in the variant name (e.g., "5x2.3mm & 1Pcs").
45# carbon steel (equivalent to AISI 1045) has a tensile strength of approximately 600–800 MPa and is widely used for machine components, gears, and pulleys in light-to-medium industrial and hobbyist applications. It is suitable for CNC routers, 3D printers, laser engravers, and similar synchronous belt drive systems. For heavy-duty industrial conveyors with continuous high-torque loads, consult your application's load requirements.
Yes — these pulleys are designed for standard L-type (3/8") timing belts with a 9.525mm pitch. The 27mm face width accommodates L-series belt widths up to 27mm (approximately 1.06 in). Confirm your belt's pitch and width before ordering to ensure compatibility.
Each pulley includes a pre-machined keyway for shaft retention. Set screws or additional retaining hardware are not included. You will need to source a matching key stock (Woodruff or parallel key) sized to the keyway dimensions listed in your selected variant. Standard key stock is widely available at hardware and engineering suppliers.
45# carbon steel is not inherently corrosion-resistant. For outdoor or humid environments, apply a protective coating such as grease, oil, or a rust-inhibiting spray after installation. For applications requiring corrosion resistance, consider stainless steel or aluminum pulleys instead.
The outer diameter of an L-type pulley can be estimated using the formula: OD = (Teeth × Pitch) / π. For example, a 20T pulley: OD = (20 × 9.525) / 3.1416 ≈ 60.6mm. For precise dimensions, contact us to confirm before ordering, especially if clearance space is critical in your design.
