Description
28HP100 Timing Pulley, 28 Teeth, H Pitch
The 28HP100 is a 28-tooth H (0.500 in trapezoidal) timing pulley. It mounts with an industry-standard bushing, sold separately, machined from ductile iron, built for 1 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 | 28HP100 |
| Teeth | 28 |
| Pitch | H (0.500 in trapezoidal) |
| For Belt Width | 1 in |
| Pitch Diameter | 4.4563 in |
| Outside Diameter | 4.4023 in |
| Flange Diameter | 4.688 in |
| Bore | Accepts P1 bushing (not included) |
| Face Width | 1.25 in |
| Overall Length | 2.125 in |
| Construction | Split Taper Hub |
| Flange Material | Steel |
| Material | Ductile Iron (no sintered or powdered metal) |
| Weight | 4.03 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 28HP100 runs H (0.500 in trapezoidal) belts in 1 in width. The pitch is standardized, so belt and pulley brands can be mixed.
Cross Reference
The 28HP100 interchanges with these equivalent part numbers, per published manufacturer interchange data:
| Manufacturer | Equivalent Part Number |
|---|---|
| Regal Rexnord (Browning®) | 28HP100 |
| Powerdrive | 28HP100 |
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 28HP100 pulley?
H (0.500 in trapezoidal) timing belts in 1 in width from any manufacturer. The pitch is standardized, so belt and pulley brands can be mixed.
Does the 28HP100 replace the Regal Rexnord 28HP100?
Yes. Published interchange data crosses the 28HP100 directly to the Regal Rexnord 28HP100, as well as Powerdrive 28HP100. Verify dimensions and bore before ordering.
Does the 28HP100 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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