The Bolt,shoulder, cataloged under National Stock Number 5306-01-505-6531, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. Government technical data includes 27 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-505-6531 |
| Item Name | Bolt,shoulder |
| FSC / FSG | 5306 / 53 — Bolts |
| Status | ACTIVE |
| Head Height | 0.188 INCHES MINIMUM AND 0.203 INCHES MAXIMUM IN |
| Fastener Length | 1.847 INCHES MINIMUM AND 1.887 INCHES MAXIMUM IN |
| Shoulder Length | 1.260 INCHES MINIMUM AND 1.270 INCHES MAXIMUM FIRST SHOULDER IN |
| Surface Treatment Document and Classification | NAS4006 NATIONAL SPEC 2ND TREATMENT RESPONSE FIRST SHOULDER |
| Surface Treatment Document and Classification | NAS4006 NATIONAL SPEC 2ND TREATMENT RESPONSE POINT |
| Surface Treatment Document and Classification | NAS4006 NATIONAL SPEC 2ND TREATMENT RESPONSE SIDES OF HEAD |
| Surface Treatment Document and Classification | NAS4006 NATIONAL SPEC 2ND TREATMENT RESPONSE THREADS |
| Surface Treatment Document and Classification | NAS4006 NATIONAL SPEC 2ND TREATMENT RESPONSE TOP OF HEAD |
| Surface Treatment Document and Classification | QQ-P-35,TYPE II OR VIII FED SPEC 1ST TREATMENT RESPONSE OVERALL |
| Shoulder Diameter | 0.4365 INCHES MINIMUM AND 0.4370 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.524 INCHES MINIMUM AND 0.544 INCHES MAXIMUM IN |
| Shoulder Shape | ROUND OVERALL |
| Material Document and Classification | AMS5731 ASSN STD 1ST MATERIAL RESPONSE OR AMS5737 ASSN STD 1ST MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.3750 INCHES IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.554 INCHES MINIMUM AND 0.564 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Surface Treatment | ALUMINUM THREADS |
| Surface Treatment | ALUMINUM FIRST SHOULDER |
| Surface Treatment | ALUMINUM POINT |
| Surface Treatment | ALUMINUM SIDES OF HEAD |
| Surface Treatment | ALUMINUM TOP OF HEAD |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL CORROSION RESISTING OVERALL |
| 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 |
| Reference | Meaning |
|---|---|
| NAS1160A6-20 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5306-01-505-6531 is a Bolt,shoulder, classified under FSC 5306, Bolts. Status: active.
Key specifications for 5306-01-505-6531: Head Height: 0.188 INCHES MINIMUM AND 0.203 INCHES MAXIMUM IN; Fastener Length: 1.847 INCHES MINIMUM AND 1.887 INCHES MAXIMUM IN; Shoulder Length: 1.260 INCHES MINIMUM AND 1.270 INCHES MAXIMUM FIRST SHOULDER IN; Surface Treatment Document and Classification: NAS4006 NATIONAL SPEC 2ND TREATMENT RESPONSE FIRST SHOULDER. 27 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.