The Pin,shoulder,headless, cataloged under National Stock Number 5315-01-648-2018, 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 25 specifications, cited from the U.S. Government catalog. The record lists 18 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5315-01-648-2018 |
| Primary Part Number | 3M943C4-4-5 |
| 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 | SQUARE END |
| Surface Treatment Document and Classification | MS 2700,METHOD 1 NATIONAL STD/SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Second End Taper Angle | 0.060 RADIANS MINIMUM AND 0.090 RADIANS MAXIMUM |
| Thread Length | 0.405 INCHES NOMINAL IN |
| First End Style | RADIUS |
| Shank Length | 0.655 INCHES NOMINAL IN |
| Style Designator | SHOULDER |
| Material Document and Classification | AMS -QQ-763,COND B NATIONAL STD/SPEC 1ST MATERIAL RESPONSE OR AMS -QQ-763,COND B NATIONAL STD/SPEC 2ND MATERIAL RESPONSE OR AMS 5738,COND B NATIONAL STD/SPEC 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 |
| Specification/standard Data | 76301-3-943 MANUFACTURERS STANDARD |
| Second Shank Length | 0.5625 INCHES NOMINAL IN |
| Shoulder Width Across Flats | 0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM 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 |
| Thread Quantity Per Inch | 28 |
| Material | STEEL COMP 302 OR STEEL COMP 304 OR STEEL COMP 303SE OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| First End Corner Radius | 0.030 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 |
|---|---|
| 3M943C4-4-5 | Sps Technologies Ltd, Tj Brooks Division (GBR) |
| WC943C4-4-5 | West Coast Aerospace, Inc. (USA) |
| 3M943C4-4-5 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| 3M943C4-4-5 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| 3M943C4-4-5 | Saturn Fasteners Inc (USA) |
| 3M943C4-4-5 | G.s. Precision, Inc. (USA) |
| 3M943C4-4-5 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| 3M943C4-4-5 | Hi-Shear Corporation (USA) |
| 3M943C4-4-5 | Houston Precision Fasteners I Lp (USA) |
| 3M943C4-4-5 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| 3M943C4-4-5 PRIMARY | The Boeing Company Div Defense (USA) |
| VS3258C4-4-5 | Howmet Global Fastening Systems Inc (USA) |
| 3M943C4-4-5 | Heartland Precision Fasteners Inc (USA) |
| 3M943C4-4-5 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| VS3258C4-4-5 | Howmet Global Fastening Systems Inc. Div Voi-Shan Products (USA) |
| D792683C4N5 | Huck International, Inc (USA) |
| 11415C4-4-5 | Reid Products Inc. Dba Reid Products Inc (USA) |
| 3M943C4-4-5 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| Reference | Meaning |
|---|---|
| 3M943C4-4-5 | 5/2 Secondary reference U.S. Government activity |
| VS3258C4-4-5 | 5/2 Secondary reference U.S. Government activity |
| AAP139C4-4-5 | 5/2 Secondary reference U.S. Government activity |
NSN 5315-01-648-2018 is a Pin,shoulder,headless, manufactured by The Boeing Company Div Defense, classified under FSC 5315, Nails, Machine Keys, and Pins. Status: active.
NSN 5315-01-648-2018 has 18 manufacturer part numbers on file: 3M943C4-4-5 (Sps Technologies Ltd, Tj Brooks Division), WC943C4-4-5 (West Coast Aerospace, Inc.), 3M943C4-4-5 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), 3M943C4-4-5 (B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace), 3M943C4-4-5 (Saturn Fasteners Inc) and 13 more.
Key specifications for 3M943C4-4-5: 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: SQUARE END; Surface Treatment Document and Classification: MS 2700,METHOD 1 NATIONAL STD/SPEC SINGLE TREATMENT RESPONSE OVERALL. 25 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.