The Pin,shoulder,headless, cataloged under National Stock Number 5315-01-331-7864, is classified within Federal Supply Class 5315 (Nails, Machine Keys, and Pins) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company Div Defense. Government technical data includes 21 specifications, cited from the U.S. Government catalog. The record lists 19 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5315-01-331-7864 |
| Primary Part Number | 3M943C4-4-6 |
| Item Name | Pin,shoulder,headless |
| FSC / FSG | 5315 / 53 — Nails, Machine Keys, and Pins |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Shank Diameter | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Second Shank Diameter | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| First End Location | THREADED END |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 0.405 INCHES NOMINAL IN |
| First End Style | SQUARE |
| Shank Length | 0.625 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 MCA1R MMS265 CAGEC 76301 MFR REF 3RD MATERIAL RESPONSE OVERALL |
| Second End Taper Length | 0.230 INCHES MINIMUM AND 0.270 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 | 0.655 INCHES NOMINAL IN |
| Shoulder Width Across Flats | 0.438 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 |
|---|---|
| 3M943C4-4-6 | Howmet Global Fastening Systems Inc. Div Voi-Shan Products (USA) |
| 3M943C4-4-6 | Saturn Fasteners Inc (USA) |
| 3M943C4-4-6 | Huck International, Inc (USA) |
| 3M943C4-4-6 | Heartland Precision Fasteners Inc (USA) |
| 3M943C4-4-6 | Reid Products Inc. Dba Reid Products Inc (USA) |
| 3M943C4-4-6 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| 3M943C4-4-6 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| 3M943C4-4-6 | Hi-Shear Corporation (USA) |
| 3M943C4-4-6 | Houston Precision Fasteners I Lp (USA) |
| 3M943C4-4-6 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| 3M943C4-4-6 | West Coast Aerospace, Inc. (USA) |
| 3M943C4-4-6 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| 3M943C4-4-6 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| 3M943C4-4-6 | Howmet Global Fastening Systems Inc (USA) |
| 3M943C4-4-6 | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| 3M943C4-4-6 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| 3M943C4-4-6 | G.s. Precision, Inc. (USA) |
| 3M943C4-4-6 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| 3M943C4-4-6 PRIMARY | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| AAP139C4-4-6 | 5/2 Secondary reference U.S. Government activity |
| 3M943C4-4-6 | 5/2 Secondary reference U.S. Government activity |
| 3M943C4-4-6 | 5/2 Secondary reference U.S. Government activity |
| D792683C4N6 | 5/9 Secondary reference U.S. Government activity |
| 11415C4-4-6 | 5/9 Secondary reference Reid Products Inc. Dba Reid Products Inc |
| D792683C4N6 | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| VS3258C4-4-6 | 5/2 Secondary reference U.S. Government activity |
NSN 5315-01-331-7864 is a Pin,shoulder,headless, manufactured by The Boeing Company Div Defense, classified under FSC 5315, Nails, Machine Keys, and Pins. Status: active.
NSN 5315-01-331-7864 has 19 manufacturer part numbers on file: 3M943C4-4-6 (Howmet Global Fastening Systems Inc. Div Voi-Shan Products), 3M943C4-4-6 (Saturn Fasteners Inc), 3M943C4-4-6 (Huck International, Inc), 3M943C4-4-6 (Heartland Precision Fasteners Inc), 3M943C4-4-6 (Reid Products Inc. Dba Reid Products Inc) and 14 more.
Key specifications for 3M943C4-4-6: Shank Diameter: 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN; Second Shank Diameter: 0.2490 INCHES MINIMUM AND 0.2495 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.