The Stud,turnlock Fastener, cataloged under National Stock Number 5325-01-173-0381, is classified within Federal Supply Class 5325 (Fastening Devices) of the Hardware and Abrasives group. The manufacturer of record is Howmet Global Fastening Systems Inc. Div Tridair Products. Government technical data includes 12 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5325-01-173-0381 |
| Primary Part Number | 01916-6K-4 |
| Item Name | Stud,turnlock Fastener |
| FSC / FSG | 5325 / 53 — Fastening Devices |
| Manufacturer | Howmet Global Fastening Systems Inc. Div Tridair Products |
| Status | ACTIVE |
| Surface Treatment Document and Classification | MIL-C-83488,TY 2,CL 3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Drive Type | SOCKET |
| Turnlock Stud Shank Style | STUD SHANK |
| Extension Length | 0.460 INCHES NOMINAL IN |
| Diameter | 0.503 INCHES NOMINAL IN |
| Stud Head Height | 0.050 INCHES MINIMUM AND 0.055 INCHES MAXIMUM IN |
| Securing Device Type | RING |
| Turnlock Stud Head Style | FLAT FILLISTER |
| Stud Shank Major Diameter | 0.3735 INCHES MINIMUM AND 0.3745 INCHES MAXIMUM IN |
| Material | STEEL OVERALL |
| Stud Thread Size and Series/type Designator | 0.250-28 UNF |
| Grip Length | 0.245 INCHES MINIMUM AND 0.255 INCHES MAXIMUM 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 |
|---|---|
| 01916-6K-4 | Howmet Global Fastening Systems Inc. Div Tridair Products (USA) |
| 01916-6K-4 | Howmet Global Fastening Systems Inc. Div Voi-Shan Products (USA) |
| M01916-6K-4 | Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok (USA) |
| Reference | Meaning |
|---|---|
| 01916-6K-4 | 5/9 Secondary reference U.S. Government activity |
| ST3M783-6-4 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| 10119303 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| 01916-6K-4 | 5/2 Secondary reference U.S. Government activity |
| 01916-65-4 | 5/9 Secondary reference Howmet Global Fastening Systems Inc. Div Tridair Products |
| MT154-6-4 | 3/2 Design control — primary reference U.S. Government activity |
NSN 5325-01-173-0381 is a Stud,turnlock Fastener, manufactured by Howmet Global Fastening Systems Inc. Div Tridair Products, classified under FSC 5325, Fastening Devices. Status: active.
NSN 5325-01-173-0381 has 3 manufacturer part numbers on file: 01916-6K-4 (Howmet Global Fastening Systems Inc. Div Tridair Products), 01916-6K-4 (Howmet Global Fastening Systems Inc. Div Voi-Shan Products), M01916-6K-4 (Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok).
Key specifications for 01916-6K-4: Surface Treatment Document and Classification: MIL-C-83488,TY 2,CL 3 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Drive Type: SOCKET; Turnlock Stud Shank Style: STUD SHANK; Extension Length: 0.460 INCHES NOMINAL IN. 12 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.