XL10T-35T Timing Belt Pulley With Step,Pitch 5.08mm Teeth Width 10/15mm Aluminum

The tooth count determines your drive ratio. Divide the driven pulley tooth count by the driver pulley tooth count to get the ratio. For example, a 20T driver paired with a 40T driven pulley gives a 2:1 reduction. For CNC and 3D printer axes, common driver tooth counts are 16T–20T. Select a tooth count that achieves your target steps-per-mm or linear resolution when combined with your motor's step angle and microstepping setting.

BF-Type pulleys have integrated side flanges on both faces of the pulley body. These flanges physically constrain the belt from walking off the pulley, making them the preferred choice for open-loop or high-speed applications. K-Type pulleys use a set-screw clamping hub instead of flanges, allowing the pulley to be repositioned axially on the shaft without tools. K-Type is common in applications where belt alignment is managed by the frame or tensioner rather than the pulley flanges.

Standard NEMA 17 stepper motors have a 5 mm output shaft — select the 5 mm bore variant. NEMA 23 motors typically use a 6.35 mm (1/4 in) shaft — select the 6.35 mm bore variant. Some NEMA 23 motors ship with an 8 mm shaft; verify your motor's datasheet before ordering. For servo motors or custom shafts, measure the shaft diameter with calipers and match to the closest available bore size listed in the variant options.

Yes. These pulleys are machined to the XL (Extra Light) profile standard with a 5.08 mm pitch. They are compatible with any standard XL open-ended or closed-loop timing belt of matching tooth width (11 mm or 16 mm). Ensure your belt width does not exceed the pulley's tooth width to maintain full tooth engagement. Mixing XL pulleys with L, T5, or GT2 belts is not compatible — verify the belt profile before ordering.

Aluminum alloy pulleys offer an excellent strength-to-weight ratio suitable for most CNC, 3D printing, laser cutting, and light automation applications. For continuous-duty industrial applications with high torque or abrasive environments, verify that the aluminum grade and surface finish meet your load requirements. The stepped hub design distributes clamping force evenly, reducing the risk of shaft deformation under normal operating loads. If your application involves heavy shock loads or very high RPM, consult the torque ratings for your specific belt and pulley combination.

K-Type pulleys include a set-screw clamping hub that secures the pulley to the shaft without a keyway. BF-Type pulleys rely on a bore fit; for applications with significant torque, a flat on the shaft or a separate shaft collar is recommended to prevent rotation. Neither type includes a keyway as standard — if your application requires a keyed connection, contact us to confirm availability or consider machining a flat on the shaft.

Yes. XL-profile pulleys are widely used in DIY CNC routers, laser engravers, and some larger-format 3D printers that use XL belts rather than the narrower GT2 profile. Common configurations include 16T–20T driver pulleys on NEMA 17 or NEMA 23 motors. Verify that your machine's belt profile is XL (5.08 mm pitch) and not GT2 (2 mm pitch) or T5 (5 mm pitch) before ordering, as these profiles are not interchangeable.