The Bolt,internal Wrenching, cataloged under National Stock Number 5306-01-663-7333, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Mcmaster-Carr Supply Co. Government technical data includes 16 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-663-7333 |
| Primary Part Number | 91274A179 |
| Item Name | Bolt,internal Wrenching |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Mcmaster-Carr Supply Co |
| Status | ACTIVE |
| Width Across Flats | 0.188 INCHES NOMINAL IN |
| Head Height | 0.25 INCHES NOMINAL IN |
| Fastener Length | 0.75 INCHES NOMINAL IN |
| Thread Length | 0.75 INCHES NOMINAL IN |
| Hardness Rating | 37.0 ROCKWELL C NOMINAL OVERALL |
| Nominal Thread Diameter | 0.25 INCHES IN |
| Thread Direction | RIGHT-HAND |
| Head Length | 0.375 INCHES NOMINAL IN |
| Width Between Flats | 0.188 INCHES NOMINAL IN |
| Minimum Tensile Strength | 170000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | HEXAGON |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNF |
| Head Diameter | 0.375 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 91274A179 PRIMARY | Mcmaster-Carr Supply Co (USA) |
NSN 5306-01-663-7333 is a Bolt,internal Wrenching, manufactured by Mcmaster-Carr Supply Co, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-663-7333 has 1 manufacturer part number on file: 91274A179 (Mcmaster-Carr Supply Co).
Key specifications for 91274A179: Width Across Flats: 0.188 INCHES NOMINAL IN; Head Height: 0.25 INCHES NOMINAL IN; Fastener Length: 0.75 INCHES NOMINAL IN; Thread Length: 0.75 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.