The Bolt,externally Relieved Body, cataloged under National Stock Number 5306-00-374-8238, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. Government technical data includes 21 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 6 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-00-374-8238 |
| Item Name | Bolt,externally Relieved Body |
| FSC / FSG | 5306 / 53 — Bolts |
| Status | ACTIVE |
| Fourth Diameter From Head | 0.390 INCHES MINIMUM AND 0.395 INCHES MAXIMUM IN |
| Head Height | 0.250 INCHES NOMINAL IN |
| Fastener Length | 3.375 INCHES NOMINAL IN |
| Distance From Centerline to Flat | 0.281 INCHES NOMINAL IN |
| Thread Length | 0.875 INCHES MAXIMUM IN |
| Material Document and Classification | SAE ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| First Diameter From Head | 0.450 INCHES MINIMUM AND 0.452 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.438 INCHES IN |
| Distance From Largest Bearing Surface of Head to End of Third Diameter | 1.562 INCHES NOMINAL IN |
| Head Style | DEE CHAMFER |
| Thread Direction | RIGHT-HAND |
| Second Diameter From Head | 0.390 INCHES MINIMUM AND 0.395 INCHES MAXIMUM IN |
| Distance From Largest Bearing Surface of Head to End of First Diameter | 0.125 INCHES NOMINAL IN |
| Externally Relieved Body Diameter Quantity | 4 |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 20 |
| Material | STEEL COMP 4140 OVERALL |
| Distance From Largest Bearing Surface of Head to End of Fourth Diameter | 2.500 INCHES NOMINAL IN |
| Third Diameter From Head | 0.450 INCHES MINIMUM AND 0.452 INCHES MAXIMUM IN |
| Thread Series Designator | UNF |
| Head Diameter | 0.750 INCHES NOMINAL 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 |
|---|---|
| 13277 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5306-00-374-8238 is a Bolt,externally Relieved Body, classified under FSC 5306, Bolts. Status: active.
6 possible matches (shared part number, not a government interchangeability claim): 5306-00-630-1823, 4920-00-910-4728, 5950-01-134-2145. Verify interchangeability with system specifications before substitution.
Key specifications for 5306-00-374-8238: Fourth Diameter From Head: 0.390 INCHES MINIMUM AND 0.395 INCHES MAXIMUM IN; Head Height: 0.250 INCHES NOMINAL IN; Fastener Length: 3.375 INCHES NOMINAL IN; Distance From Centerline to Flat: 0.281 INCHES NOMINAL 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.