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Pulleys

497 Products

The "L" in L Series refers to the pitch of the timing belt, which is 3/8 inch (or 9.525 mm) between the centers of adjacent teeth.

L Series Corrosion-Resistant Timing Belt Pulleys

These pulleys are typically made from materials such as stainless steel, anodized aluminum, or high-performance plastics.

L Series Quick-Disconnect Timing Belt Pulleys

The quick-disconnect feature allows these pulleys to be easily attached to or removed from a shaft using a split taper bushing system.

XL Series Corrosion-Resistant Timing Belt Pulleys

The XL Series refers to a timing belt with a 1/5 inch (5.08 mm) pitch, making these pulleys suitable for applications that require smaller, more precise power transmission.

XL Series Lightweight Timing Belt Pulleys

The primary benefit of these pulleys is their lightweight construction, which is crucial in applications where reducing mass can improve performance, efficiency, and ease of handling.

XL Series Timing Belt Pulleys

The "XL" designation refers to the pitch of the belt teeth, which is 1/5 inch (5.08 mm), making these pulleys suitable for applications requiring accurate and reliable timing and power transmission.

H Series Quick-Disconnect Timing Belt Pulleys

These pulleys have a series of evenly spaced teeth around their circumference that mesh precisely with the corresponding teeth on an H Series timing belt.

H Series Timing Belt Pulleys

The "H" in the series designation refers to the pitch of the timing belt, which is 1/2 inch (12.7 mm), making these pulleys suitable for transmitting higher torques in applications requiring robust and reliable performance.

MXL Series Lightweight Timing Belt Pulleys

The "MXL" designation refers to the extremely fine pitch of 0.080 inches (2.032 mm), and they are crafted from materials and designed in a way that minimizes weight while maintaining precise timing and power transmission.

MXL Series Corrosion-ResistantTiming Belt Pulleys

By preventing corrosion, these pulleys maintain consistent power transmission, ensuring the reliability and accuracy of the system in which they are used.

Timing Belt Idler Pulleys

They do not transmit power like drive pulleys but instead help to maintain the belt’s correct tension and path, ensuring smooth operation of the timing system.

LILY Bearing stocks 497 timing belt pulleys across four pitch families — MXL, XL, L, and H — in steel, iron, aluminum, and plastic. New to timing belt pulleys, or need help matching one to an existing belt? See our Timing Belt Pulley Guide for how they work and how to size one. Use the filters below, or the comparison table, to narrow down by pitch, material, bore type, and width.

Compare Pulley Series by Pitch

Series	Pitch	Common Material	Outer Diameter Range	Tooth Range	Watch Out For
MXL Series Timing Belt Pulleys	0.080″ (2.032 mm)	Plastic, Aluminum	0.42″–3.47″ (10.8–88 mm)	10–130	Finest pitch — not rated for high-torque drives
XL Series Timing Belt Pulleys	0.200″ (5.08 mm)	Steel, Aluminum, Plastic	0.87″–4.6″ (22–117 mm)	10–72	Confirm belt width matches pulley face width
L Series Timing Belt Pulleys	0.375″ (9.525 mm)	Steel, Iron, Aluminum	1.44″–7.13″ (36.5–181 mm)	10–60	Most common general-purpose pitch — verify against existing belt before ordering
H Series Timing Belt Pulleys	0.500″ (12.7 mm)	Steel, Iron	2.48″–19.05″ (63–484 mm)	14–120	Heaviest pitch in catalog — sized for high-torque drives
Timing Belt Idler Pulleys	Spans MXL–H and 8/14 mm HTD	Steel, Iron	1.4″–6.46″ (35.6–164 mm)	16–40	Not a drive pulley — guides and tensions the belt only

Quick-disconnect and corrosion-resistant variants of L, H, and XL share the same pitch as their parent series — only the mounting method or finish differs.

Bore & Mounting Options

424 of 497 SKUs ship with a finished bore (machined to size, keyway included, ready to install). The remaining 73 ship as a plain bore for custom machining. L and H series pulleys are also available with a quick-disconnect taper bushing for tool-free removal. Use the Overall Width filter to match your pulley's face width to your belt width.

Need a Custom Pulley?

Don't see the bore size, pitch, or material you need? Our team can cross-reference an existing pulley or quote a custom configuration. Request a Quote or Contact Us.

Frequently Asked Questions

What is the difference between a finished bore and a plain bore?

A finished bore is machined to a specific shaft diameter and typically includes a keyway, ready to install. A plain bore is left unfinished so it can be machined to a custom diameter, keyway, or set-screw pattern.