The Bolt,shoulder, cataloged under National Stock Number 5306-01-260-6541, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Howmet Global Fastening Systems Inc. Government technical data includes 18 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-260-6541 |
| Primary Part Number | 3M381-7-24 |
| Item Name | Bolt,shoulder |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Head Height | 0.250 INCHES MINIMUM AND 0.265 INCHES MAXIMUM IN |
| Fastener Length | 2.079 INCHES MINIMUM AND 2.109 INCHES MAXIMUM IN |
| Shoulder Length | 1.490 INCHES MINIMUM AND 1.510 INCHES MAXIMUM FIRST SHOULDER IN |
| Surface Treatment Document and Classification | QQ-P-416 TY2 CL3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Shoulder Diameter | 0.4985 INCHES MINIMUM AND 0.4995 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.494 INCHES MINIMUM AND 0.579 INCHES MAXIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Hardness Rating | 36.0 ROCKWELL C MINIMUM AND 40.0 ROCKWELL C MAXIMUM OVERALL |
| Nominal Thread Diameter | 0.438 INCHES IN |
| Head Style | DISHED HEXAGON |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.741 INCHES MINIMUM AND 0.752 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Minimum Tensile Strength | 95000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 20 |
| Material | STEEL COMP E4340 OR STEEL COMP 4140 OR STEEL COMP 8740 OR STEEL COMP 8735 OR STEEL COMP 6150 OVERALL |
| Thread Series Designator | UNF |
| 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 |
|---|---|
| 3M381-7-24 | Howmet Global Fastening Systems Inc (USA) |
| 3M381-7-24 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| 3M381-7-24 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| 3M381-7-24 | 5/9 Secondary reference U.S. Government activity |
| 3M381-7-24 | C/1 Advisory reference — outside the item-of-supply concept Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company |
| 3M381-7-24 | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| 3M381-7-24 | 5/2 Secondary reference U.S. Government activity |
| 3M381-7-24 | 3/9 Design control — primary reference The Boeing Company Div Defense |
NSN 5306-01-260-6541 is a Bolt,shoulder, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-260-6541 has 3 manufacturer part numbers on file: 3M381-7-24 (Howmet Global Fastening Systems Inc), 3M381-7-24 (Sps Technologies, Llc Dba PB Fasteners), 3M381-7-24 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners).
Key specifications for 3M381-7-24: Head Height: 0.250 INCHES MINIMUM AND 0.265 INCHES MAXIMUM IN; Fastener Length: 2.079 INCHES MINIMUM AND 2.109 INCHES MAXIMUM IN; Shoulder Length: 1.490 INCHES MINIMUM AND 1.510 INCHES MAXIMUM FIRST SHOULDER IN; Surface Treatment Document and Classification: QQ-P-416 TY2 CL3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL. 18 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.