The Bolt,shoulder, cataloged under National Stock Number 5306-00-118-6971, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Huck International, Inc. Government technical data includes 16 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-00-118-6971 |
| Primary Part Number | C344-12 |
| Item Name | Bolt,shoulder |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Huck International, Inc |
| Status | ACTIVE |
| Head Height | 0.281 INCHES MINIMUM AND 0.296 INCHES MAXIMUM IN |
| Fastener Length | 2.247 INCHES MINIMUM AND 2.277 INCHES MAXIMUM IN |
| Shoulder Length | 1.842 INCHES MINIMUM AND 1.862 INCHES MAXIMUM FIRST SHOULDER IN |
| Shoulder Diameter | 0.5355 INCHES MINIMUM AND 0.5365 INCHES MAXIMUM FIRST SHOULDER IN |
| Thread Length | 0.385 INCHES MINIMUM AND 0.435 INCHES MAXIMUM IN |
| Shoulder Shape | ROUND FIRST SHOULDER |
| Shank Unthreaded Hole Diameter | 0.106 INCHES MINIMUM AND 0.116 INCHES MAXIMUM FIRST HOLE IN |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | DISHED HEXAGON |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.865 INCHES MINIMUM AND 0.877 INCHES MAXIMUM IN |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL CORROSION RESISTING OVERALL |
| Thread Series Designator | UNF |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 2.127 INCHES MINIMUM AND 2.157 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 |
| Part Number | Manufacturer |
|---|---|
| C344-12 | Huck International, Inc (USA) |
| C344-12 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| C344-12 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| Reference | Meaning |
|---|---|
| C344-12 | 3/2 Design control — primary reference U.S. Government activity |
| C344-12 | 5/9 Secondary reference V B Products Inc Tulsa Ok |
| VS2784-12 | 5/2 Secondary reference U.S. Government activity |
| C344-12 | 5/9 Secondary reference U.S. Government activity |
| 64151-6-12 | 5/9 Secondary reference Fl Industries Inc Phillips Drill Div |
NSN 5306-00-118-6971 is a Bolt,shoulder, manufactured by Huck International, Inc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-118-6971 has 3 manufacturer part numbers on file: C344-12 (Huck International, Inc), C344-12 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), C344-12 (Sps Technologies, Llc Dba PB Fasteners).
1 possible match (shared part number, not a government interchangeability claim): 5950-00-249-7346. Verify interchangeability with system specifications before substitution.
Key specifications for C344-12: Head Height: 0.281 INCHES MINIMUM AND 0.296 INCHES MAXIMUM IN; Fastener Length: 2.247 INCHES MINIMUM AND 2.277 INCHES MAXIMUM IN; Shoulder Length: 1.842 INCHES MINIMUM AND 1.862 INCHES MAXIMUM FIRST SHOULDER IN; Shoulder Diameter: 0.5355 INCHES MINIMUM AND 0.5365 INCHES MAXIMUM FIRST SHOULDER 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.