The Bolt,internally Relieved Body, cataloged under National Stock Number 5306-01-381-1577, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. Government technical data includes 25 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-381-1577 |
| Item Name | Bolt,internally Relieved Body |
| FSC / FSG | 5306 / 53 — Bolts |
| Status | ACTIVE |
| Head Height | 0.375 INCHES MINIMUM AND 0.390 INCHES MAXIMUM IN |
| Fastener Length | 2.494 INCHES MINIMUM AND 2.524 INCHES MAXIMUM IN |
| Internal Thread Length | 0.250 INCHES NOMINAL HEAD IN |
| Thread Series | UNF HEAD |
| Concentric Hole Depth | 1.687 INCHES MINIMUM AND 1.712 INCHES MAXIMUM IN |
| Internal Thread Direction | RIGHT-HAND HEAD |
| Thread Length | 0.630 INCHES MINIMUM AND 0.665 INCHES MAXIMUM IN |
| Shank Unthreaded Hole Diameter | 0.107 INCHES MINIMUM AND 0.114 INCHES MAXIMUM THREADS IN |
| Threads Per Inch | 28 HEAD |
| Style Designator | COUNTERBORE THREADED |
| Material Document and Classification | AMS 5662 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.250 INCHES HEAD IN |
| Width Between Flats | 1.052 INCHES MINIMUM AND 1.064 INCHES MAXIMUM IN |
| Shoulder Diameter | 0.7477 INCHES MINIMUM AND 0.7487 INCHES MAXIMUM IN |
| Internal Thread Class | 3B HEAD |
| Concentric Hole Diameter | 0.107 INCHES MINIMUM AND 0.114 INCHES MAXIMUM IN |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 20 |
| Material | NICKEL ALLOY 718 OVERALL |
| Shoulder Length | 1.712 INCHES MINIMUM AND 1.722 INCHES MAXIMUM IN |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 2.234 INCHES MINIMUM AND 2.244 INCHES MAXIMUM THREADS IN |
| 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 |
|---|---|
| 17P6W8247-505 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5306-01-381-1577 is a Bolt,internally Relieved Body, classified under FSC 5306, Bolts. Status: active.
Key specifications for 5306-01-381-1577: Head Height: 0.375 INCHES MINIMUM AND 0.390 INCHES MAXIMUM IN; Fastener Length: 2.494 INCHES MINIMUM AND 2.524 INCHES MAXIMUM IN; Internal Thread Length: 0.250 INCHES NOMINAL HEAD IN; Thread Series: UNF HEAD. 25 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.