The Bolt,externally Relieved Body, cataloged under National Stock Number 5306-00-857-8488, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. Government technical data includes 22 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5306-00-857-8488 |
| Item Name | Bolt,externally Relieved Body |
| FSC / FSG | 5306 / 53 — Bolts |
| Status | ACTIVE |
| Fourth Diameter From Head | 0.186 INCHES MINIMUM AND 0.196 INCHES MAXIMUM IN |
| Head Height | 0.150 INCHES MINIMUM AND 0.170 INCHES MAXIMUM IN |
| Fastener Length | 3.330 INCHES MINIMUM AND 3.360 INCHES MAXIMUM IN |
| Distance From Centerline to Flat | 0.140 INCHES MINIMUM AND 0.150 INCHES MAXIMUM IN |
| Thread Length | 0.640 INCHES MINIMUM AND 0.700 INCHES MAXIMUM IN |
| Material Document and Classification | AMS 5643 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| First Diameter From Head | 0.263 INCHES MINIMUM AND 0.264 INCHES MAXIMUM IN |
| Distance From Largest Bearing Surface of Head to End of Second Diameter | 0.180 INCHES MINIMUM AND 0.190 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Distance From Largest Bearing Surface of Head to End of Third Diameter | 0.240 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN |
| Head Style | DEE CHAMFER |
| Thread Direction | RIGHT-HAND |
| Second Diameter From Head | 0.190 INCHES MINIMUM AND 0.200 INCHES MAXIMUM IN |
| Distance From Largest Bearing Surface of Head to End of First Diameter | 0.060 INCHES MINIMUM AND 0.070 INCHES MAXIMUM IN |
| Externally Relieved Body Diameter Quantity | 4 |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL COMP 630 OVERALL |
| Distance From Largest Bearing Surface of Head to End of Fourth Diameter | 2.630 INCHES MINIMUM AND 2.720 INCHES MAXIMUM IN |
| Third Diameter From Head | 0.263 INCHES MINIMUM AND 0.264 INCHES MAXIMUM IN |
| Thread Series Designator | UNF |
| Head Diameter | 0.460 INCHES MINIMUM AND 0.480 INCHES MAXIMUM 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 |
|---|---|
| 865093-1 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5306-00-857-8488 is a Bolt,externally Relieved Body, classified under FSC 5306, Bolts. Status: active.
Key specifications for 5306-00-857-8488: Fourth Diameter From Head: 0.186 INCHES MINIMUM AND 0.196 INCHES MAXIMUM IN; Head Height: 0.150 INCHES MINIMUM AND 0.170 INCHES MAXIMUM IN; Fastener Length: 3.330 INCHES MINIMUM AND 3.360 INCHES MAXIMUM IN; Distance From Centerline to Flat: 0.140 INCHES MINIMUM AND 0.150 INCHES MAXIMUM IN. 22 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.