The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-625-8665, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. Government technical data includes 19 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5306-01-625-8665 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Status | ACTIVE |
| Point Diameter | 0.5500 INCHES MINIMUM AND 0.5550 INCHES MAXIMUM IN |
| Head Height | 0.281 INCHES MINIMUM AND 0.296 INCHES MAXIMUM IN |
| Fastener Length | 6.157 INCHES NOMINAL IN |
| Surface Treatment Document and Classification | AMS-QQ-P-416, TYPE II, CLASS 2 ASSN STD SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.594 INCHES NOMINAL IN |
| Material Document and Classification | AMS6349 ASSN STD 1ST MATERIAL RESPONSE OR AMS6389 ASSN STD 2ND MATERIAL RESPONSE OR AMS6415 ASSN STD 3RD MATERIAL RESPONSE OR AMS6484 ASSN STD 4TH MATERIAL RESPONSE OR AMS6322 ASSN STD 5TH MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.5625 INCHES IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Point Style | FLAT |
| Grip Length | 5.553 INCHES MINIMUM AND 5.573 INCHES MAXIMUM IN |
| Width Between Flats | 0.865 INCHES MINIMUM AND 0.877 INCHES MAXIMUM IN |
| Grip Diameter | 0.5761 INCHES MINIMUM AND 0.5771 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM OVERALL |
| Minimum Tensile Strength | 160000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 18 |
| Material | STEEL COMP 4140 OR STEEL COMP 4340 OR 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 |
|---|---|
| NAS6209-89X | 3/2 Design control — primary reference U.S. Government activity |
NSN 5306-01-625-8665 is a Bolt,close Tolerance, classified under FSC 5306, Bolts. Status: active.
Key specifications for 5306-01-625-8665: Point Diameter: 0.5500 INCHES MINIMUM AND 0.5550 INCHES MAXIMUM IN; Head Height: 0.281 INCHES MINIMUM AND 0.296 INCHES MAXIMUM IN; Fastener Length: 6.157 INCHES NOMINAL IN; Surface Treatment Document and Classification: AMS-QQ-P-416, TYPE II, CLASS 2 ASSN STD SINGLE TREATMENT RESPONSE OVERALL. 19 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.