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When a slipping or mismatched pulley throws off your CNC router, 3D printer, or conveyor drive, every axis move becomes unreliable. Engineers and makers who need repeatable, zero-backlash motion depend on a correctly sized XL synchronous pulley matched to their shaft bore and belt width. This XL timing pulley is designed for that exact scenario — a direct drop-in for 10mm wide XL-pitch timing belts across a wide range of shaft sizes.
Each pulley is machined from aluminum alloy, featuring an XL tooth profile (pitch 5.08mm / 0.200 in) and a finished bore ranging from 3.175mm (0.125 in) to 20mm (0.787 in). Tooth counts span 10T to 19T, covering outer diameters from approximately 16mm (0.63 in) to 31mm (1.22 in). Two hub styles are available: BF-type (flanged, no set screw) and K-type (with keyway and set screw), letting you match the pulley to your shaft retention method.
Typical use cases include CNC router X/Y axis drives requiring a compact 10T–12T pulley on a 5mm or 6mm motor shaft, 3D printer extruder and motion systems using 14T–17T pulleys on NEMA stepper shafts (5mm bore), and light industrial conveyor or indexing table drives where a 19T K-type pulley on a 16–20mm shaft provides the needed gear ratio and positive locking.
| Belt Type | XL (Extra Light) |
|---|---|
| Belt Pitch | 5.08mm (0.200 in) |
| Belt Width Compatibility | 10mm (0.394 in) |
| Tooth Count Options | 10T, 12T, 14T, 17T, 19T |
| Bore Range | 3.175mm – 20mm (0.125 in – 0.787 in) |
| Hub Style | BF-type (flanged bore) / K-type (keyway + set screw) |
| Material | Aluminum alloy |
| Outer Diameter (approx.) | See variant options |
| Flange Diameter (approx.) | See variant options |
| Hub Length | See variant options |
| Pack Quantity | 1 Pcs / 2 Pcs / 3 Pcs |
| Surface Finish | Natural anodized / machined |
The tooth count determines the pulley's pitch diameter and, combined with your driven pulley's tooth count, sets the drive ratio. For CNC and 3D printer motion systems, 10T–14T pulleys on the motor side are common for compact, high-resolution setups. Use 17T–19T when you need higher belt speed or a larger pitch diameter to reduce belt wrap angle on longer center distances. Match the tooth count to your belt length and center distance calculation.
BF-type (Blind Flange) pulleys have a plain finished bore with flanges on both sides of the belt groove. They rely on press-fit, adhesive, or an external collar for shaft retention — common in light-load or fixed-shaft applications. K-type pulleys include a keyway slot and a set screw, providing positive mechanical locking to the shaft. K-type is recommended for applications with reversing loads, higher torque, or where shaft slippage would cause positioning errors.
Standard NEMA 17 stepper motors have a 5mm output shaft. Select the 5mm bore option. If your motor has a flat (D-cut) shaft, the BF-type bore will still fit; for a fully round shaft with positive locking, choose the K-type with a set screw. Always measure your actual shaft diameter with calipers before ordering, as some motors vary slightly.
No. This pulley is machined specifically for the XL tooth profile (5.08mm pitch, trapezoidal tooth form). GT2 belts use a 2mm pitch curvilinear profile, and HTD belts use a different curvilinear pitch. Mixing tooth profiles causes poor engagement, accelerated wear, and potential belt skipping. Confirm your belt is XL-pitch before purchasing.
Aluminum alloy pulleys are well-suited for the torque and speed ranges typical of CNC routers, 3D printers, laser cutters, and light conveyor systems. For heavy industrial applications with sustained high torque or shock loads, verify the pulley's rated load against your system's peak torque. The K-type hub with set screw provides additional security against rotational slippage compared to the BF-type plain bore.
Aluminum has natural corrosion resistance, but the machined bore and keyway areas are bare metal and can oxidize over time in humid or wet conditions. For outdoor or washdown environments, apply a light machine oil to the bore and set screw area, or consider a stainless steel pulley for long-term corrosion resistance. The anodized outer surface provides additional protection for the belt-contact area.
Yes. When you select a specific Teeths + Bores + Types & Amounts combination, all pieces in a 2 Pcs or 3 Pcs pack are identical — same tooth count, same bore diameter, and same hub style. This is useful for equipping multiple axes with the same pulley or keeping spares on hand without placing separate orders.
