The Bolt,machine, cataloged under National Stock Number 5306-01-157-8339, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Bsi Standards Limited. Government technical data includes 11 specifications, cited from the U.S. Government catalog. The record lists 2 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-157-8339 |
| Primary Part Number | AS21514 |
| Item Name | Bolt,machine |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Bsi Standards Limited |
| Status | ACTIVE |
| Extended Washer Thickness | 0.060 INCHES NOMINAL IN |
| Head Height | 0.303 INCHES NOMINAL IN |
| Fastener Length | 1.875 INCHES NOMINAL IN |
| Extended Washer Diameter | 0.438 INCHES NOMINAL IN |
| 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 |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| 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 |
NSN 5306-01-157-8339 is a Bolt,machine, manufactured by Bsi Standards Limited, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-157-8339 has 2 manufacturer part numbers on file: AS21514 (Bsi Standards Limited), AS21514 (Ads Group Limited).
Key specifications for AS21514: Extended Washer Thickness: 0.060 INCHES NOMINAL IN; Head Height: 0.303 INCHES NOMINAL IN; Fastener Length: 1.875 INCHES NOMINAL IN; Extended Washer Diameter: 0.438 INCHES NOMINAL IN. 11 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.