The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-452-4591, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. Government technical data includes 21 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-452-4591 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Status | ACTIVE |
| Head Height | 0.105 INCHES MINIMUM AND 0.120 INCHES MAXIMUM IN |
| Fastener Length | 3.543 INCHES MINIMUM AND 3.563 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE RING |
| Surface Treatment Document and Classification | QQ-P-416, TYPE II,CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.308 INCHES MINIMUM AND 0.323 INCHES MAXIMUM IN |
| Hardness Rating | 36.0 ROCKWELL C MINIMUM AND 41.0 ROCKWELL C MAXIMUM FASTENER |
| Material Document and Classification | AMS 5643 ASSN STD 1ST MATERIAL RESPONSE OR AMS 5673 ASSN STD 2ND MATERIAL RESPONSE RING |
| Material Document and Classification | MIL-S-5000 MIL STD 1ST MATERIAL RESPONSE OR MIL-S-5626 MIL STD 2ND MATERIAL RESPONSE OR MIL-S-6049 MIL STD 3RD MATERIAL RESPONSE OR MIL-S-6758 MIL STD 4TH MATERIAL RESPONSE OR MIL-S-8503 MIL STD 5TH MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | HEXAGON |
| Thread Direction | RIGHT-HAND |
| Grip Length | 3.125 INCHES MINIMUM AND 3.141 INCHES MAXIMUM IN |
| Width Between Flats | 0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN |
| Grip Diameter | 0.2483 INCHES MINIMUM AND 0.2492 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE RING |
| Surface Treatment | CADMIUM OVERALL |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL COMP E4340 OR STEEL COMP 4140 OR STEEL COMP 8740 OR STEEL COMP 4130 OR STEEL COMP 6150 OVERALL |
| Material | STEEL COMP 630 OR STEEL COMP 631 RING |
| 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 |
|---|---|
| ST3M735-4-50 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| 121673-4-50 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5306-01-452-4591 is a Bolt,close Tolerance, classified under FSC 5306, Bolts. Status: active.
Key specifications for 5306-01-452-4591: Head Height: 0.105 INCHES MINIMUM AND 0.120 INCHES MAXIMUM IN; Fastener Length: 3.543 INCHES MINIMUM AND 3.563 INCHES MAXIMUM IN; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE RING; Surface Treatment Document and Classification: QQ-P-416, TYPE II,CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL. 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.