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.
21H-FS Timing Pulley Flange, 3.574 in OD
The 21H-FS is a timing pulley flange with a 3.574 in outside diameter and 2.817 in inside diameter, steel. Flanges press onto unflanged pulleys to keep the belt tracking on the teeth, which is required when shaft alignment cannot be held exactly parallel.
$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
| Specification | Value |
|---|---|
| Part Number | 21H-FS |
| Outside Diameter | 3.574 in |
| Inside Diameter | 2.817 in |
| Stock Thickness | 0.09 in |
| Overall Form Thickness | 0.125 in |
| Material | Steel (no sintered or powdered metal) |
| Weight | 0.1 lb |
| Country of Origin | United States. ISO 9001:2015 certified manufacturing. |
Applications
- Flanging custom pulleys machined from bar stock
- Replacing damaged flanges on existing pulleys
- Belt retention on drives with axial belt drift
Cross Reference
The 21H-FS interchanges with these equivalent part numbers, per published manufacturer interchange data:
| Manufacturer | Equivalent Part Number |
|---|---|
| Neuman | 21H-PS-10S |
| Grainger | 816UX0 |
| Powerdrive | 21H-FS |
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
When does a timing pulley need flanges like the 21H-FS?
When the belt can walk axially: long center distances, vertical shafts, or any drive where the shafts are not held perfectly parallel. Standard practice is to flange at least one pulley in the drive, typically the smaller one.
Does the 21H-FS replace the Neuman 21H-PS-10S?
Yes. Published interchange data crosses the 21H-FS directly to the Neuman 21H-PS-10S, as well as Grainger 816UX0, Powerdrive 21H-FS. Verify dimensions and bore before ordering.
Does the 21H-FS 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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