Description
44XL037-6S4 Timing Pulley, 44 Teeth, XL Pitch, 5/16 in Bore
The 44XL037-6S4 is a 44-tooth XL (0.200 in trapezoidal) timing pulley with a 5/16 in finished bore, machined from steel with a black oxide finish, built for 0.375 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 | 44XL037-6S4 |
| Teeth | 44 |
| Pitch | XL (0.200 in trapezoidal) |
| For Belt Width | 0.375 in |
| Pitch Diameter | 2.8011 in |
| Outside Diameter | 2.7811 in |
| Bore | 5/16 in finished bore |
| Face Width | 0.563 in |
| Overall Length | 1 in |
| Hub Diameter | 1.5 in |
| Construction | Standard Hub |
| Set Screws | 2 x 8-32 |
| Material | Steel (no sintered or powdered metal) |
| Finish | Black Oxide |
| Weight | 0.38 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 44XL037-6S4 runs XL (0.200 in trapezoidal) belts in 0.375 in width. The pitch is standardized, so belt and pulley brands can be mixed.
Cross Reference
The 44XL037-6S4 interchanges with these equivalent part numbers, per published manufacturer interchange data:
| Manufacturer | Equivalent Part Number |
|---|---|
| Martin | 44XL037 |
| Regal Rexnord (Browning®) | 44XLB037S |
| Mitsuboshi | 44XL037-6S4 |
| McMaster-Carr | 6495K729 |
| Powerdrive | 44XL037-6S4 |
Always verify dimensions and bore size before substituting part numbers across manufacturers.
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Multi-unit and OEM quantities qualify for volume discounts. Call or email for a quantity quote.
Frequently Asked Questions
What belts fit the 44XL037-6S4 pulley?
XL (0.200 in trapezoidal) timing belts in 0.375 in width from any manufacturer. The pitch is standardized, so belt and pulley brands can be mixed.
Does the 44XL037-6S4 replace the Martin 44XL037?
Yes. Published interchange data crosses the 44XL037-6S4 directly to the Martin 44XL037, as well as Regal Rexnord 44XLB037S, Mitsuboshi 44XL037-6S4, McMaster-Carr 6495K729. Verify dimensions and bore before ordering.
Does the 44XL037-6S4 ship from Houston?
Yes. Stock items ship same day from our Houston, Texas warehouse. Call (888) 203-2358 to confirm availability.
Need a quote on 44XL037-6S4?
Houston warehouse, same-day shipping on stock items.
Call (888) 203-2358All 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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