Description
QD18L050 Timing Pulley, 18 Teeth, L Pitch
The QD18L050 is a 18-tooth L (0.375 in trapezoidal) timing pulley. It mounts with an industry-standard bushing, sold separately, machined from steel with a black oxide finish, built for 0.5 in wide belts. Machined from solid stock, never sintered or powdered metal.
$50 minimum order on drive components. Mix and match any pulleys, bushings, sheaves, sprockets, and accessories in your cart to reach the $50 minimum. Questions? Call (888) 203-2358.
Specifications

Dimension key for this construction type. Values for this part number are in the table below.
| Specification | Value |
|---|---|
| Part Number | QD18L050 |
| Teeth | 18 |
| Pitch | L (0.375 in trapezoidal) |
| For Belt Width | 0.5 in |
| Pitch Diameter | 2.1486 in |
| Outside Diameter | 2.1186 in |
| Flange Diameter | 2.375 in |
| Bore | Accepts JA bushing (not included) |
| Face Width | 0.75 in |
| Overall Length | 0.75 in |
| Construction | Quick Disconnect Hub |
| Flange Material | Steel |
| Material | Steel (no sintered or powdered metal) |
| Finish | Black Oxide |
| Weight | 0.441 lb |
| Country of Origin | United States. ISO 9001:2015 certified manufacturing. |
Applications
- Instrumentation, office equipment, and precision positioning drives
- 3D printers and desktop CNC equipment
- Robotics, medical devices, and packaging machinery
Belt Compatibility
The QD18L050 runs L (0.375 in trapezoidal) belts in 0.5 in width. The pitch is standardized, so belt and pulley brands can be mixed.
Cross Reference
The QD18L050 interchanges with these equivalent part numbers, per published manufacturer interchange data:
| Manufacturer | Equivalent Part Number |
|---|---|
| Martin | 18L050 JA |
| TB Woods® | 18L050 |
| Regal Rexnord (Browning®) | 18L050JA |
| Mitsuboshi | QD18L050 |
| Jason Industrial | 18L050JA |
| Neuman | 18L050-JA |
| Ametric | 18L050.JA |
| McMaster-Carr | 6495K211 |
| Grainger | 809VE5 |
| Powerdrive | QD18L050 |
Always verify dimensions and bore size before substituting part numbers across manufacturers.
Buying in bulk? Save on volume.
Multi-unit and OEM quantities qualify for volume discounts. Call or email for a quantity quote.
Frequently Asked Questions
What belts fit the QD18L050 pulley?
L (0.375 in trapezoidal) timing belts in 0.5 in width from any manufacturer. The pitch is standardized, so belt and pulley brands can be mixed.
Does the QD18L050 replace the Martin 18L050 JA?
Yes. Published interchange data crosses the QD18L050 directly to the Martin 18L050 JA, as well as TB Woods 18L050, Regal Rexnord 18L050JA, Mitsuboshi QD18L050. Verify dimensions and bore before ordering.
Does the QD18L050 ship from Houston?
Yes. Stock items ship same day from our Houston, Texas warehouse. Call (888) 203-2358 to confirm availability.
All third-party part numbers and trademarks referenced are the property of their respective owners. References are for compatibility identification only and do not imply affiliation or endorsement.
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