The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-271-2522, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. Government technical data includes 24 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5306-01-271-2522 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Status | ACTIVE |
| Surface Finish | 63.0 MICROINCHES GRIP |
| Surface Finish | 63.0 MICROINCHES BEARING SURFACE OF HEAD |
| Head Height | 0.095 INCHES MINIMUM AND 0.110 INCHES MAXIMUM IN |
| Fastener Length | 2.060 INCHES MINIMUM AND 2.080 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | QQ-P-416 TY2 CL2 FED SPEC SINGLE TREATMENT RESPONSE FASTENER |
| Thread Length | 0.266 INCHES MINIMUM AND 0.318 INCHES MAXIMUM IN |
| Hardness Rating | 36.0 ROCKWELL C MINIMUM AND 41.0 ROCKWELL C MAXIMUM FASTENER |
| Shank Unthreaded Hole Diameter | 0.070 INCHES MINIMUM AND 0.080 INCHES MAXIMUM FIRST HOLE IN |
| Material Document and Classification | AMS5643 ASSN STD 1ST MATERIAL RESPONSE OR AMS5644 ASSN STD 2ND MATERIAL RESPONSE OR QQ-S-763 FED SPEC 2ND MATERIAL RESPONSE LOCKING FEATURE |
| Nominal Thread Diameter | 0.190 INCHES IN |
| Head Style | CROWNED HEXAGON |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.688 INCHES MINIMUM AND 1.704 INCHES MAXIMUM IN |
| Width Between Flats | 0.367 INCHES MINIMUM AND 0.376 INCHES MAXIMUM IN |
| Grip Diameter | 0.1885 INCHES MINIMUM AND 0.1894 INCHES MAXIMUM IN |
| Locking Feature | DETENT RING GRIP |
| Surface Treatment | CADMIUM AND CHROMATE FASTENER |
| Minimum Tensile Strength | 95000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 32 |
| Material | STEEL COMP 630 OR STEEL COMP 631 OR STEEL COMP 440C LOCKING FEATURE |
| Material | STEEL COMP E4340 OR STEEL COMP 8740 OR STEEL COMP 4140 OR STEEL COMP 4130 OR STEEL COMP 6150 FASTENER |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 1.967 INCHES MINIMUM AND 1.997 INCHES MAXIMUM FIRST HOLE IN |
| 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 |
|---|---|
| MS27576-3-27 | 3/2 Design control — primary reference U.S. Government activity |
| MS27576-3-27 | 5/9 Secondary reference U.S. Government activity |
NSN 5306-01-271-2522 is a Bolt,close Tolerance, classified under FSC 5306, Bolts. Status: active.
Key specifications for 5306-01-271-2522: Surface Finish: 63.0 MICROINCHES GRIP; Surface Finish: 63.0 MICROINCHES BEARING SURFACE OF HEAD; Head Height: 0.095 INCHES MINIMUM AND 0.110 INCHES MAXIMUM IN; Fastener Length: 2.060 INCHES MINIMUM AND 2.080 INCHES MAXIMUM IN. 24 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.