The Bolt,externally Relieved Body, cataloged under National Stock Number 5306-00-494-1789, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. Government technical data includes 19 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5306-00-494-1789 |
| Item Name | Bolt,externally Relieved Body |
| FSC / FSG | 5306 / 53 — Bolts |
| Status | ACTIVE |
| Head Height | 0.178 INCHES MINIMUM AND 0.198 INCHES MAXIMUM IN |
| Fastener Length | 1.178 INCHES MINIMUM AND 1.198 INCHES MAXIMUM IN |
| Thread Length | 0.543 INCHES MINIMUM AND 0.583 INCHES MAXIMUM IN |
| Hardness Rating | 40.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM OVERALL |
| First Diameter From Head | 0.6245 INCHES MINIMUM AND 0.6249 INCHES MAXIMUM IN |
| Distance From Largest Bearing Surface of Head to End of Second Diameter | 0.479 INCHES MINIMUM AND 0.489 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Distance From Largest Bearing Surface of Head to End of Third Diameter | 0.615 INCHES MINIMUM AND 0.635 INCHES MAXIMUM IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Second Diameter From Head | 0.4495 INCHES MINIMUM AND 0.4515 INCHES MAXIMUM IN |
| Width Between Flats | 0.735 INCHES MINIMUM AND 0.755 INCHES MAXIMUM IN |
| Distance From Largest Bearing Surface of Head to End of First Diameter | 0.333 INCHES MINIMUM AND 0.353 INCHES MAXIMUM IN |
| Externally Relieved Body Diameter Quantity | 3 |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 20 |
| Material | STEEL COMP 4140 OR STEEL COMP 4340 OR STEEL COMP 8740 OR STEEL COMP E4340 OVERALL |
| Third Diameter From Head | 0.6245 INCHES MINIMUM AND 0.6249 INCHES MAXIMUM IN |
| 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 |
|---|---|
| 696060 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5306-00-494-1789 is a Bolt,externally Relieved Body, classified under FSC 5306, Bolts. Status: active.
Key specifications for 5306-00-494-1789: Head Height: 0.178 INCHES MINIMUM AND 0.198 INCHES MAXIMUM IN; Fastener Length: 1.178 INCHES MINIMUM AND 1.198 INCHES MAXIMUM IN; Thread Length: 0.543 INCHES MINIMUM AND 0.583 INCHES MAXIMUM IN; Hardness Rating: 40.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM OVERALL. 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.