The Bolt,machine, cataloged under National Stock Number 5306-01-166-4521, 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 17 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5306-01-166-4521 |
| Primary Part Number | BLT4745 |
| Item Name | Bolt,machine |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Rolls-Royce Plc Div Defense (europe) |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES GRIP |
| Extended Washer Thickness | 0.060 INCHES NOMINAL IN |
| Head Height | 0.303 INCHES NOMINAL IN |
| Fastener Length | 1.250 INCHES NOMINAL IN |
| Extended Washer Diameter | 0.438 INCHES NOMINAL IN |
| Thread Length | 0.750 INCHES MINIMUM AND 0.810 INCHES MAXIMUM IN |
| Hole Configuration Style | DOUBLE HEXAGON LONGITUDINAL HOLE |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | DOUBLE HEXAGON W/HOLE |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.312 INCHES NOMINAL IN |
| Surface Treatment | SILVER OVERALL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Hole Quantity | 4 |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Hole Type | DRILLED |
| 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 |
|---|---|
| BLT4745 PRIMARY | Rolls-Royce Plc Div Defense (europe) (GBR) |
| Reference | Meaning |
|---|---|
| 99-607-6408 | 6/9 Informative reference only U.S. Government activity |
| 99-607-6408 | 6/9 Informative reference only Nato Stock Number Potential Interchangeability Link |
NSN 5306-01-166-4521 is a Bolt,machine, manufactured by Rolls-Royce Plc Div Defense (europe), classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-166-4521 has 1 manufacturer part number on file: BLT4745 (Rolls-Royce Plc Div Defense (europe)).
Key specifications for BLT4745: Surface Finish: 32.0 MICROINCHES GRIP; Extended Washer Thickness: 0.060 INCHES NOMINAL IN; Head Height: 0.303 INCHES NOMINAL IN; Fastener Length: 1.250 INCHES NOMINAL IN. 17 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.