The Bolt,externally Relieved Body, cataloged under National Stock Number 5306-00-503-5273, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. Government technical data includes 23 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5306-00-503-5273 |
| Item Name | Bolt,externally Relieved Body |
| FSC / FSG | 5306 / 53 — Bolts |
| Status | ACTIVE |
| Extended Washer Thickness | 0.650 INCHES NOMINAL IN |
| Head Height | 1.225 INCHES NOMINAL IN |
| Fastener Length | 4.125 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | LC+77-1061,TY 2,FCM 36659 MFR REF SINGLE TREATMENT RESPONSE OVERALL |
| Extended Washer Diameter | 2.070 INCHES NOMINAL IN |
| Thread Length | 3.845 INCHES MINIMUM AND 3.875 INCHES MAXIMUM IN |
| Material Document and Classification | MIL-S-5000 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| First Diameter From Head | 1.123 INCHES MINIMUM AND 1.124 INCHES MAXIMUM IN |
| Distance From Largest Bearing Surface of Head to End of Second Diameter | 2.620 INCHES NOMINAL IN |
| Nominal Thread Diameter | 1.000 INCHES IN |
| Distance From Largest Bearing Surface of Head to End of Third Diameter | 2.870 INCHES MINIMUM AND 2.900 INCHES MAXIMUM IN |
| Head Style | HEXAGON EXTENDED WASHER |
| Thread Direction | RIGHT-HAND |
| Second Diameter From Head | 0.998 INCHES MINIMUM AND 0.999 INCHES MAXIMUM IN |
| Width Between Flats | 1.052 INCHES MINIMUM AND 1.064 INCHES MAXIMUM IN |
| Distance From Largest Bearing Surface of Head to End of First Diameter | 2.063 INCHES NOMINAL IN |
| Externally Relieved Body Diameter Quantity | 1 |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 12 |
| Material | STEEL COMP E4340 OVERALL |
| Third Diameter From Head | 0.872 INCHES MINIMUM AND 0.882 INCHES MAXIMUM IN |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| 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 |
|---|---|
| 1304127-119 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5306-00-503-5273 is a Bolt,externally Relieved Body, classified under FSC 5306, Bolts. Status: active.
Key specifications for 5306-00-503-5273: Extended Washer Thickness: 0.650 INCHES NOMINAL IN; Head Height: 1.225 INCHES NOMINAL IN; Fastener Length: 4.125 INCHES NOMINAL IN; Surface Treatment Document and Classification: LC+77-1061,TY 2,FCM 36659 MFR REF SINGLE TREATMENT RESPONSE OVERALL. 23 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.