The Bolt,externally Relieved Body, cataloged under National Stock Number 5306-01-175-8765, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Rolls-Royce Plc Div Defense (europe). Government technical data includes 24 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-175-8765 |
| Primary Part Number | B490389 |
| Item Name | Bolt,externally Relieved Body |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Rolls-Royce Plc Div Defense (europe) |
| Status | ACTIVE |
| Head Height | 0.150 INCHES NOMINAL IN |
| Fastener Length | 1.150 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | RSP 170 FSCM K0378 MFR REF SINGLE TREATMENT RESPONSE OVERALL |
| Distance From Centerline to Flat | 0.187 INCHES MINIMUM AND 0.192 INCHES MAXIMUM IN |
| Thread Length | 0.320 INCHES NOMINAL IN |
| Hole Configuration Style | ROUND |
| Material Document and Classification | DTD 5066 FSCM K0378 MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| First Diameter From Head | 0.190 INCHES MINIMUM AND 0.195 INCHES MAXIMUM IN |
| Distance From Largest Bearing Surface of Head to End of Second Diameter | 0.800 INCHES MINIMUM AND 0.830 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | DEE CHAMFER |
| Thread Direction | RIGHT-HAND |
| Second Diameter From Head | 0.190 INCHES MINIMUM AND 0.195 INCHES MAXIMUM IN |
| Distance From Largest Bearing Surface of Head to End of First Diameter | 0.310 INCHES MINIMUM AND 0.340 INCHES MAXIMUM IN |
| Externally Relieved Body Diameter Quantity | 2 |
| Surface Treatment | CADMIUM OVERALL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL CORROSION RESISTING OVERALL |
| Hole Quantity | 1 |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Hole Type | DRILLED |
| Hole Diameter | 0.669 INCHES MINIMUM AND 0.739 INCHES MAXIMUM IN |
| Head Diameter | 0.512 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 |
|---|---|
| B490389 PRIMARY | Rolls-Royce Plc Div Defense (europe) (GBR) |
| Reference | Meaning |
|---|---|
| 99-781-0380 | 6/9 Informative reference only U.S. Government activity |
| 99-781-0380 | 6/9 Informative reference only Nato Stock Number Potential Interchangeability Link |
NSN 5306-01-175-8765 is a Bolt,externally Relieved Body, manufactured by Rolls-Royce Plc Div Defense (europe), classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-175-8765 has 1 manufacturer part number on file: B490389 (Rolls-Royce Plc Div Defense (europe)).
Key specifications for B490389: Head Height: 0.150 INCHES NOMINAL IN; Fastener Length: 1.150 INCHES NOMINAL IN; Surface Treatment Document and Classification: RSP 170 FSCM K0378 MFR REF SINGLE TREATMENT RESPONSE OVERALL; Distance From Centerline to Flat: 0.187 INCHES MINIMUM AND 0.192 INCHES MAXIMUM IN. 24 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.