The Pin,shoulder,headless, cataloged under National Stock Number 5315-01-356-7251, is classified within Federal Supply Class 5315 (Nails, Machine Keys, and Pins) of the Hardware and Abrasives group. The manufacturer of record is Sps Technologies, Llc Dba PB Fasteners. Government technical data includes 21 specifications, cited from the U.S. Government catalog. The record lists 8 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5315-01-356-7251 |
| Primary Part Number | 3M943C4C3-25 |
| Item Name | Pin,shoulder,headless |
| FSC / FSG | 5315 / 53 — Nails, Machine Keys, and Pins |
| Manufacturer | Sps Technologies, Llc Dba PB Fasteners |
| Status | ACTIVE |
| Shank Diameter | 0.2490 INCHES MINIMUM AND 0.2496 INCHES MAXIMUM IN |
| Second Shank Diameter | 0.3710 INCHES MINIMUM AND 0.3730 INCHES MAXIMUM IN |
| First End Location | THREADED END |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.345 INCHES NOMINAL IN |
| First End Style | SQUARE |
| Shank Length | 0.533 INCHES NOMINAL IN |
| Style Designator | SHOULDER |
| Material Document and Classification | QQ-S-763 COND B FED SPEC 1ST MATERIAL RESPONSE OR QQ-S-763 COND B FED SPEC 2ND MATERIAL RESPONSE OR MCAIRMMS265 CAGEC 76301 MFR REF 3RD MATERIAL RESPONSE OVERALL |
| Second End Taper Length | 0.418 INCHES MINIMUM AND 0.458 INCHES MAXIMUM IN |
| Second End Relationship with First End | NOT IDENTICAL |
| Thread Direction | RIGHT-HAND |
| Nominal Thread Size | 0.250 INCHES IN |
| Second Shank Length | 1.998 INCHES NOMINAL IN |
| Shoulder Width Across Flats | 0.500 INCHES NOMINAL IN |
| Surface Treatment | PASSIVATE OVERALL |
| Second End Tip Radius | 0.060 INCHES MINIMUM AND 0.090 INCHES MAXIMUM IN |
| Second End Style | CHAMFERED |
| Thread Class | 3A A |
| Material | STEEL COMP 302 OR STEEL COMP 304 OR STEEL COMP 303SE OVERALL |
| 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 |
| Part Number | Manufacturer |
|---|---|
| 3M943C4C3-25 PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| 3M943C4C3-25 | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| 3M943C4C3-25 PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| 3M943C4C3-25 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| 3M943C4C3-25 PRIMARY | Hi-Shear Corporation (USA) |
| 3M943C4C3-25 PRIMARY | The Boeing Company Div Defense (USA) |
| D79268CC3N25 | Huck International, Inc (USA) |
| 3M943C4C3-25 PRIMARY | G.s. Precision, Inc. (USA) |
| Reference | Meaning |
|---|---|
| D792684CC3N25 | 5/9 Secondary reference U.S. Government activity |
| 11415C4C3-25 | C/1 Advisory reference — outside the item-of-supply concept Reid Products Inc. Dba Reid Products Inc |
| AAP139C4-3-25 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| VS3258C4C3-25 | 3/2 Design control — primary reference U.S. Government activity |
| AAP139C4C3-25 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
NSN 5315-01-356-7251 is a Pin,shoulder,headless, manufactured by Sps Technologies, Llc Dba PB Fasteners, classified under FSC 5315, Nails, Machine Keys, and Pins. Status: active.
NSN 5315-01-356-7251 has 8 manufacturer part numbers on file: 3M943C4C3-25 (Sps Technologies, Llc Dba PB Fasteners), 3M943C4C3-25 (Sps Technologies Ltd, Tj Brooks Division), 3M943C4C3-25 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), 3M943C4C3-25 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), 3M943C4C3-25 (Hi-Shear Corporation) and 3 more.
Key specifications for 3M943C4C3-25: Shank Diameter: 0.2490 INCHES MINIMUM AND 0.2496 INCHES MAXIMUM IN; Second Shank Diameter: 0.3710 INCHES MINIMUM AND 0.3730 INCHES MAXIMUM IN; First End Location: THREADED END; Surface Treatment Document and Classification: QQ-P-35 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.