The Bolt,externally Relieved Body, cataloged under National Stock Number 5306-00-416-2104, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Cooper Machinery Services Llc. Government technical data includes 27 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-00-416-2104 |
| Primary Part Number | 76957-001 |
| Item Name | Bolt,externally Relieved Body |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Cooper Machinery Services Llc |
| Status | ACTIVE |
| Fourth Diameter From Head | 1.123 INCHES MINIMUM AND 1.124 INCHES MAXIMUM IN |
| Distance From Largest Bearing Surface of Head to End of Fifth Diameter | 8.999 INCHES NOMINAL IN |
| Head Height | 1.000 INCHES NOMINAL IN |
| Fastener Length | 13.375 INCHES NOMINAL IN |
| Distance From Centerline to Flat | 0.688 INCHES NOMINAL IN |
| Thread Length | 1.531 INCHES MINIMUM IN |
| Hardness Rating | 25.0 ROCKWELL C MINIMUM AND 30.0 ROCKWELL C MAXIMUM OVERALL |
| Shank Unthreaded Hole Diameter | 0.219 INCHES NOMINAL FIRST HOLE IN |
| Material Document and Classification | 66 FED STD SINGLE MATERIAL RESPONSE OVERALL |
| First Diameter From Head | 1.025 INCHES MINIMUM AND 1.035 INCHES MAXIMUM IN |
| Distance From Largest Bearing Surface of Head to End of Second Diameter | 0.875 INCHES NOMINAL IN |
| Nominal Thread Diameter | 1.125 INCHES IN |
| Distance From Largest Bearing Surface of Head to End of Third Diameter | 3.313 INCHES NOMINAL IN |
| Head Style | DEE CHAMFER |
| Thread Direction | RIGHT-HAND |
| Second Diameter From Head | 1.123 INCHES MINIMUM AND 1.124 INCHES MAXIMUM IN |
| Distance From Largest Bearing Surface of Head to End of First Diameter | 0.500 INCHES NOMINAL IN |
| Fifth Diameter From Head | 1.025 INCHES MINIMUM AND 1.035 INCHES MAXIMUM IN |
| Externally Relieved Body Diameter Quantity | 5 |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 12 |
| Material | STEEL COMP 4140 OVERALL |
| Distance From Largest Bearing Surface of Head to End of Fourth Diameter | 5.188 INCHES NOMINAL IN |
| Third Diameter From Head | 1.025 INCHES MINIMUM AND 1.035 INCHES MAXIMUM IN |
| Thread Series Designator | UNF |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 12.888 INCHES NOMINAL FIRST HOLE IN |
| Head Diameter | 2.000 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 |
| Part Number | Manufacturer |
|---|---|
| 76957-001 PRIMARY | Cooper Machinery Services Llc (USA) |
| Reference | Meaning |
|---|---|
| 76957-1 | 5/9 Secondary reference Cooper Machinery Services Llc |
NSN 5306-00-416-2104 is a Bolt,externally Relieved Body, manufactured by Cooper Machinery Services Llc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-416-2104 has 1 manufacturer part number on file: 76957-001 (Cooper Machinery Services Llc).
1 possible match (shared part number, not a government interchangeability claim): 5980-01-547-3713. Verify interchangeability with system specifications before substitution.
Key specifications for 76957-001: Fourth Diameter From Head: 1.123 INCHES MINIMUM AND 1.124 INCHES MAXIMUM IN; Distance From Largest Bearing Surface of Head to End of Fifth Diameter: 8.999 INCHES NOMINAL IN; Head Height: 1.000 INCHES NOMINAL IN; Fastener Length: 13.375 INCHES NOMINAL IN. 27 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.