The Bolt,externally Relieved Body, cataloged under National Stock Number 5306-00-277-6571, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. Government technical data includes 20 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5306-00-277-6571 |
| Item Name | Bolt,externally Relieved Body |
| FSC / FSG | 5306 / 53 — Bolts |
| Status | ACTIVE |
| Head Height | 0.190 INCHES NOMINAL IN |
| Fastener Length | 0.950 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.400 INCHES MINIMUM IN |
| Hardness Rating | 80.0 ROCKWELL B MINIMUM OVERALL |
| Material Document and Classification | QQ-S-764 COND A FED SPEC SINGLE MATERIAL RESPONSE OVERALL |
| First Diameter From Head | 0.331 INCHES MINIMUM AND 0.333 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.562 INCHES NOMINAL IN |
| Distance From Largest Bearing Surface of Head to End of First Diameter | 0.550 INCHES NOMINAL IN |
| Externally Relieved Body Diameter Quantity | 1 |
| Surface Treatment | PASSIVATE OVERALL |
| Minimum Tensile Strength | 80000 POUNDS PER SQUARE INCH LBS |
| Minimum Yield Strength | 30000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 2A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL COMP 303 OVERALL |
| Thread Series Designator | UNF |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 774960-1 | 5/2 Secondary reference U.S. Government activity |
| 884017-1 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5306-00-277-6571 is a Bolt,externally Relieved Body, classified under FSC 5306, Bolts. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 4820-00-456-3624. Verify interchangeability with system specifications before substitution.
Key specifications for 5306-00-277-6571: Head Height: 0.190 INCHES NOMINAL IN; Fastener Length: 0.950 INCHES NOMINAL IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.400 INCHES MINIMUM IN. 20 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.