XL timing belts are sized by tooth count. Multiply the tooth count by the pitch to get the belt circumference: Circumference = Tooth Count × 5.08mm (0.200"). For example, a 100XL belt has a circumference of 508mm (≈20.0"). To find your required tooth count, either measure your existing belt's outer circumference and divide by 5.08mm, or use the standard two-pulley belt-length formula: L = 2C + π(D₁+D₂)/2 + (D₁−D₂)²/4C, where C is center distance and D₁/D₂ are pulley pitch diameters. Round up to the nearest available tooth count.

XL stands for Extra Light — an ANSI/RMA standard designation for a trapezoidal tooth belt with a 5.08mm (0.200") pitch. It is lighter and more compact than the L series (9.525mm pitch) or H series (12.7mm pitch). XL is generally the right choice for precision positioning in CNC routers, 3D printers, laser cutters, and small plotters. Choose L or H when you need to transmit significantly higher torque in heavier machinery.

At 12.7mm (1/2") width, XL timing belts are typically rated for light-to-medium duty applications. Tensile load capacity is generally in the range of 100–250 N depending on belt length, pulley diameter, and operating speed. For high-torque or continuous industrial duty, consider upgrading to an L or H series belt or a wider XL variant. Contact us if you need to confirm load ratings for a specific application.

The neoprene rubber body generally provides good resistance to moisture, incidental coolant splash, and light oil mist — making these suitable for typical workshop and light industrial environments. They are not designed for prolonged submersion or exposure to aggressive solvents and fuels. For outdoor installations, shield the belt from direct UV exposure where possible, as prolonged UV can degrade rubber compounds over time.

Yes, in most cases. These belts follow the ANSI XL trapezoidal tooth profile standard (5.08mm pitch), so they are compatible with any standard XL-series pulley or sprocket. The key check is pulley groove width: confirm your pulley accepts a 12.7mm (1/2") wide belt. If your pulleys are designed for a narrower (e.g., 6.4mm) or wider (e.g., 19.1mm) belt, you will need a different width variant.

Divide the tooth count by 5 to get the approximate circumference in inches (since XL pitch = 0.200" = 1/5"). Examples: 60XL ≈ 12.0", 100XL ≈ 20.0", 200XL ≈ 40.0", 500XL ≈ 100.0". For exact values, multiply tooth count × 0.200". This is the pitch circumference (measured at the belt's pitch line, not the outer surface).

Each listing is sold as 1 piece per order. To order multiple belts of the same size, simply increase the quantity in your cart. If you need bulk pricing for larger quantities, contact us before placing your order and we will do our best to accommodate.