The Bolt,ribbed Shoulder, cataloged under National Stock Number 5306-00-371-4093, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Hayes Wheels Intl Inc Akron Opns. Government technical data includes 19 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-00-371-4093 |
| Primary Part Number | 81118 |
| Item Name | Bolt,ribbed Shoulder |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Hayes Wheels Intl Inc Akron Opns |
| Status | ACTIVE |
| Head Height | 0.417 INCHES MINIMUM AND 0.427 INCHES MAXIMUM IN |
| Fastener Length | 2.312 INCHES MINIMUM AND 2.328 INCHES MAXIMUM IN |
| Shoulder Length | 0.750 INCHES NOMINAL FIRST SHOULDER IN |
| Distance From Largest Diameter of Bearing Surface of Head to Ribs | 0.062 INCHES NOMINAL IN |
| Shoulder Diameter | 0.554 INCHES MINIMUM AND 0.564 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 1.375 INCHES MINIMUM IN |
| Shoulder Shape | RIBBED FIRST SHOULDER |
| Hardness Rating | 32.1 ROCKWELL C MINIMUM AND 37.6 ROCKWELL C MAXIMUM OVERALL |
| Material Document and Classification | ASTM A108 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Rib Length | 0.750 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.562 INCHES IN |
| Features Provided | CASEHARDENED |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Rib Major Diameter | 0.612 INCHES MINIMUM AND 0.622 INCHES MAXIMUM IN |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 18 |
| Thread Series Designator | UNF |
| Head Diameter | 0.875 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 81118 PRIMARY | Hayes Wheels Intl Inc Akron Opns (USA) |
| Reference | Meaning |
|---|---|
| 81118 | 5/9 Secondary reference Rexworks Inc |
NSN 5306-00-371-4093 is a Bolt,ribbed Shoulder, manufactured by Hayes Wheels Intl Inc Akron Opns, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-371-4093 has 1 manufacturer part number on file: 81118 (Hayes Wheels Intl Inc Akron Opns).
1 possible match (shared part number, not a government interchangeability claim): 2920-01-127-0058. Verify interchangeability with system specifications before substitution.
Key specifications for 81118: Head Height: 0.417 INCHES MINIMUM AND 0.427 INCHES MAXIMUM IN; Fastener Length: 2.312 INCHES MINIMUM AND 2.328 INCHES MAXIMUM IN; Shoulder Length: 0.750 INCHES NOMINAL FIRST SHOULDER IN; Distance From Largest Diameter of Bearing Surface of Head to Ribs: 0.062 INCHES NOMINAL IN. 19 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.