The Bolt,machine, cataloged under National Stock Number 5306-01-174-6520, 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 21 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-174-6520 |
| Primary Part Number | AS43312 |
| Item Name | Bolt,machine |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Bsi Standards Limited |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES THREADS |
| Extended Washer Thickness | 0.060 INCHES NOMINAL IN |
| Head Height | 0.303 INCHES NOMINAL IN |
| Fastener Length | 0.750 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | DTD939,FSCM K7766 MFR REF SINGLE TREATMENT RESPONSE THREADS |
| Extended Washer Diameter | 0.438 INCHES NOMINAL IN |
| Thread Length | 0.651 INCHES MINIMUM AND 0.671 INCHES MAXIMUM IN |
| Hole Configuration Style | DOUBLE HEXAGON LONGITUDINAL HOLE |
| Material Document and Classification | DTD5066,FSCM K7766 MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| 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 THREADS |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL OVERALL |
| Hole Quantity | 4 |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Hole Type | DRILLED |
| Hole Diameter | 0.079 INCHES MINIMUM AND 0.087 INCHES MAXIMUM 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 |
|---|---|
| AS43312 PRIMARY | Bsi Standards Limited (GBR) |
| Reference | Meaning |
|---|---|
| AS43312 | C/1 Advisory reference — outside the item-of-supply concept Society of British Aerospace Companies Ltd (sbac) |
NSN 5306-01-174-6520 is a Bolt,machine, manufactured by Bsi Standards Limited, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-174-6520 has 1 manufacturer part number on file: AS43312 (Bsi Standards Limited).
Key specifications for AS43312: Surface Finish: 32.0 MICROINCHES THREADS; Extended Washer Thickness: 0.060 INCHES NOMINAL IN; Head Height: 0.303 INCHES NOMINAL IN; Fastener Length: 0.750 INCHES NOMINAL 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.