The Bolt,internally Relieved Body, cataloged under National Stock Number 5306-00-121-9441, 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19 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5306-00-121-9441 |
| Item Name | Bolt,internally Relieved Body |
| FSC / FSG | 5306 / 53 — Bolts |
| Status | ACTIVE |
| Extended Washer Thickness | 0.094 INCHES NOMINAL IN |
| Head Height | 0.656 INCHES NOMINAL IN |
| Fastener Length | 5.476 INCHES NOMINAL IN |
| Extended Washer Diameter | 1.875 INCHES NOMINAL IN |
| Thread Length | 0.849 INCHES NOMINAL IN |
| Style Designator | COUNTERBORE UNTHREADED |
| Material Document and Classification | MIL-S-8844,CL 1 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 1.000 INCHES IN |
| Counterbore Depth | 1.060 INCHES NOMINAL IN |
| Thread Direction | RIGHT-HAND |
| Counterbore Diameter | 0.854 INCHES NOMINAL IN |
| Width Between Flats | 1.430 INCHES NOMINAL IN |
| Shoulder Diameter | 1.247 INCHES NOMINAL IN |
| Concentric Hole Diameter | 0.634 INCHES NOMINAL IN |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 12 |
| Material | STEEL COMP 4340 OVERALL |
| Shoulder Length | 4.065 INCHES NOMINAL 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 |
|---|---|
| 12L10031-15 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5306-00-121-9441 is a Bolt,internally Relieved Body, classified under FSC 5306, Bolts. Status: active.
Key specifications for 5306-00-121-9441: Extended Washer Thickness: 0.094 INCHES NOMINAL IN; Head Height: 0.656 INCHES NOMINAL IN; Fastener Length: 5.476 INCHES NOMINAL IN; Extended Washer Diameter: 1.875 INCHES NOMINAL IN. 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.