The Stud,turnlock Fastener, cataloged under National Stock Number 5325-00-406-5682, is classified within Federal Supply Class 5325 (Fastening Devices) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company Div Defense. Government technical data includes 10 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5325-00-406-5682 |
| Primary Part Number | 3M303A4-3 |
| Item Name | Stud,turnlock Fastener |
| FSC / FSG | 5325 / 53 — Fastening Devices |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Drive Type | SOCKET |
| Material Accommodated Thickness | 0.187 INCHES NOMINAL IN |
| Material Document and Classification | AMS 6322 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Diameter | 0.358 INCHES NOMINAL IN |
| Securing Device Type | RING |
| Turnlock Stud Head Style | FLAT COUNTERSUNK |
| Stud Shank Major Diameter | 0.249 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Material | STEEL COMP 8740 OVERALL |
| 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 |
|---|---|
| 3M303A4-3 PRIMARY | The Boeing Company Div Defense (USA) |
| 3M303A4-3 | Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok (USA) |
| 3M303A4-3 | Howmet Global Fastening Systems Inc. Div Voi-Shan Products (USA) |
| Reference | Meaning |
|---|---|
| 3M303A4-3 | 5/9 Secondary reference U.S. Government activity |
| 1926-4-3 | 5/9 Secondary reference U.S. Government activity |
| 3M303A4-3 | 5/2 Secondary reference U.S. Government activity |
| 3M303A4-3 | 5/9 Secondary reference U.S. Government activity |
NSN 5325-00-406-5682 is a Stud,turnlock Fastener, manufactured by The Boeing Company Div Defense, classified under FSC 5325, Fastening Devices. Status: active.
NSN 5325-00-406-5682 has 3 manufacturer part numbers on file: 3M303A4-3 (The Boeing Company Div Defense), 3M303A4-3 (Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok), 3M303A4-3 (Howmet Global Fastening Systems Inc. Div Voi-Shan Products).
2 possible matches (shared part number, not a government interchangeability claim): 3040-00-908-0717, 3950-01-354-7046. Verify interchangeability with system specifications before substitution.
Key specifications for 3M303A4-3: Surface Treatment Document and Classification: QQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Drive Type: SOCKET; Material Accommodated Thickness: 0.187 INCHES NOMINAL IN; Material Document and Classification: AMS 6322 ASSN STD SINGLE MATERIAL RESPONSE OVERALL. 10 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.