The Bolt,externally Relieved Body, cataloged under National Stock Number 5306-01-321-1047, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney. Government technical data includes 21 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 5306-01-321-1047 |
| Primary Part Number | 4075890 |
| Item Name | Bolt,externally Relieved Body |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney |
| Status | ACTIVE |
| Extended Washer Thickness | 0.006 INCHES MINIMUM AND 0.016 INCHES MAXIMUM IN |
| Head Height | 0.195 INCHES MINIMUM AND 0.205 INCHES MAXIMUM IN |
| Fastener Length | 0.470 INCHES MINIMUM AND 0.480 INCHES MAXIMUM IN |
| Extended Washer Diameter | 0.460 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN |
| Thread Length | 0.215 INCHES NOMINAL IN |
| Material Document and Classification | PWA96,CAGE77445 MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| First Diameter From Head | 0.247 INCHES MINIMUM AND 0.251 INCHES MAXIMUM IN |
| Distance From Largest Bearing Surface of Head to End of Second Diameter | 0.115 INCHES MINIMUM AND 0.125 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.3125 INCHES IN |
| Distance From Largest Bearing Surface of Head to End of Third Diameter | 0.255 INCHES MINIMUM AND 0.265 INCHES MAXIMUM IN |
| Head Style | HEXAGON EXTENDED WASHER |
| Thread Direction | RIGHT-HAND |
| Second Diameter From Head | 0.317 INCHES MINIMUM AND 0.319 INCHES MAXIMUM IN |
| Width Between Flats | 0.497 INCHES NOMINAL IN |
| Distance From Largest Bearing Surface of Head to End of First Diameter | 0.080 INCHES MINIMUM AND 0.090 INCHES MAXIMUM IN |
| Externally Relieved Body Diameter Quantity | 2 |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | NICKEL ALLOY OVERALL |
| Third Diameter From Head | 0.247 INCHES MINIMUM AND 0.251 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 |
| Part Number | Manufacturer |
|---|---|
| 4075890 | Rtx Corporation Div Pratt & Whitney (USA) |
| 4075890 PRIMARY | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| 4075890 | M.s. Aerospace Inc. Dba Ms Aerospace Inc (USA) |
| Reference | Meaning |
|---|---|
| 5306PL1499282 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
NSN 5306-01-321-1047 is a Bolt,externally Relieved Body, manufactured by Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-321-1047 has 3 manufacturer part numbers on file: 4075890 (Rtx Corporation Div Pratt & Whitney), 4075890 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney), 4075890 (M.s. Aerospace Inc. Dba Ms Aerospace Inc).
1 possible match (shared part number, not a government interchangeability claim): 2510-01-662-6977. Verify interchangeability with system specifications before substitution.
Key specifications for 4075890: Extended Washer Thickness: 0.006 INCHES MINIMUM AND 0.016 INCHES MAXIMUM IN; Head Height: 0.195 INCHES MINIMUM AND 0.205 INCHES MAXIMUM IN; Fastener Length: 0.470 INCHES MINIMUM AND 0.480 INCHES MAXIMUM IN; Extended Washer Diameter: 0.460 INCHES MINIMUM AND 0.510 INCHES MAXIMUM 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.