Description
Representative image shown. Actual product appearance varies by size, bore, and configuration. Refer to the specifications table for exact dimensions of this part number.
QD120L050 Timing Pulley, 12 Teeth, L Pitch
The QD120L050 is a 12-tooth L (0.375 in trapezoidal) timing pulley. It mounts with an industry-standard bushing, sold separately, machined from cast iron with a black oxide finish, built for 0.5 in wide belts. Machined from solid stock, never sintered or powdered metal.
Specifications

Dimension key for this construction type. Values for this part number are in the table below.
| Specification | Value |
|---|---|
| Part Number | QD120L050 |
| Teeth | 12 |
| Pitch | L (0.375 in trapezoidal) |
| For Belt Width | 0.5 in |
| Pitch Diameter | 14.3239 in |
| Outside Diameter | 14.2939 in |
| Bore | Accepts SD bushing (not included) |
| Face Width | 0.75 in |
| Overall Length | 1.25 in |
| Construction | Quick Disconnect Hub |
| Material | Cast Iron (no sintered or powdered metal) |
| Finish | Black Oxide |
| Weight | 31.4 lb |
| Country of Origin | China |
Applications
- Instrumentation, office equipment, and precision positioning drives
- 3D printers and desktop CNC equipment
- Robotics, medical devices, and packaging machinery
- Weight-sensitive drives (webbed, lightened construction)
Belt Compatibility
The QD120L050 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 QD120L050 interchanges with these equivalent part numbers, per published manufacturer interchange data:
| Manufacturer | Equivalent Part Number |
|---|---|
| Martin | 120L050SD |
| TB Woods® | 120L050 |
| Regal Rexnord (Browning®) | 120L050SD |
| Mitsuboshi | QD120L050 |
| Jason Industrial | 120L050SD |
| Ametric | 120L050.SD |
| Grainger | 809VD3 |
| Powerdrive | QD120L050 |
| Continental (ContiTech) | 120L050-SD |
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 QD120L050 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 QD120L050 replace the Martin 120L050SD?
Yes. Published interchange data crosses the QD120L050 directly to the Martin 120L050SD, as well as TB Woods 120L050, Regal Rexnord 120L050SD, Mitsuboshi QD120L050. Verify dimensions and bore before ordering.
Does the QD120L050 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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