The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-494-5773, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. Government technical data includes 16 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5306-01-494-5773 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Status | ACTIVE |
| Head Height | 0.250 INCHES NOMINAL IN |
| Fastener Length | 2.658 INCHES MINIMUM AND 2.688 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-416, TYPE II, CLASS2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.735 INCHES NOMINAL IN |
| Material Document and Classification | MIL-S-5626 MIL SPEC 1ST MATERIAL RESPONSE AND AMS6415 ASSN STD 2ND MATERIAL RESPONSE AND MIL-S-5000 MIL SPEC 3RD MATERIAL RESPONSE AND MIL-S-6049 MIL SPEC 4TH MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.923 INCHES MINIMUM AND 1.953 INCHES MAXIMUM IN |
| Width Between Flats | 0.741 INCHES MINIMUM AND 0.752 INCHES MAXIMUM IN |
| Grip Diameter | 0.4945 INCHES MINIMUM AND 0.4950 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM OVERALL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 20 |
| Material | STEEL COMP 4140 AND STEEL COMP 4340 AND STEEL COMP E4340 AND STEEL COMP 8740 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 |
|---|---|
| NAS6608-31 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5306-01-494-5773 is a Bolt,close Tolerance, classified under FSC 5306, Bolts. Status: active.
Key specifications for 5306-01-494-5773: Head Height: 0.250 INCHES NOMINAL IN; Fastener Length: 2.658 INCHES MINIMUM AND 2.688 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-416, TYPE II, CLASS2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 0.735 INCHES NOMINAL IN. 16 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.