The Bolt,ribbed Shoulder, cataloged under National Stock Number 5306-00-174-1939, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is U S Army Tank Automotive Command Amsta-Im-Mm. Government technical data includes 21 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 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 | 5306-00-174-1939 |
| Primary Part Number | 5296776 |
| Item Name | Bolt,ribbed Shoulder |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Head Height | 0.234 INCHES NOMINAL IN |
| Rib Included Angle | 120.0 DEGREES NOMINAL |
| Fastener Length | 0.719 INCHES MINIMUM AND 0.781 INCHES MAXIMUM IN |
| Shoulder Length | 0.301 INCHES MINIMUM AND 0.321 INCHES MAXIMUM FIRST SHOULDER IN |
| Distance From Largest Diameter of Bearing Surface of Head to Ribs | 0.062 INCHES NOMINAL IN |
| Shoulder Diameter | 0.3120 INCHES NOMINAL FIRST SHOULDER IN |
| Thread Length | 0.437 INCHES MINIMUM IN |
| Shoulder Shape | RIBBED FIRST SHOULDER |
| Material Document and Classification | QQ-S-634 FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Rib Length | 0.187 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.312 INCHES IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.500 INCHES NOMINAL IN |
| Rib Major Diameter | 0.320 INCHES MINIMUM AND 0.326 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM OVERALL |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL COMP 1035 OVERALL |
| Thread Series Designator | UNF |
| Rib Quantity | 20 |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 5306-00-174-1939 is a Bolt,ribbed Shoulder, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-174-1939 has 3 manufacturer part numbers on file: 5296776 (U S Army Tank Automotive Command Amsta-Im-Mm), C4255 (Borg-Warner Corp), C4255 (Sachs-Boge of America).
1 possible match (shared part number, not a government interchangeability claim): 3010-01-426-4870. Verify interchangeability with system specifications before substitution.
Key specifications for 5296776: Head Height: 0.234 INCHES NOMINAL IN; Rib Included Angle: 120.0 DEGREES NOMINAL; Fastener Length: 0.719 INCHES MINIMUM AND 0.781 INCHES MAXIMUM IN; Shoulder Length: 0.301 INCHES MINIMUM AND 0.321 INCHES MAXIMUM FIRST SHOULDER IN. 21 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.