The Stud Assembly,turnlock Fastener, cataloged under National Stock Number 5325-01-558-6679, is classified within Federal Supply Class 5325 (Fastening Devices) of the Hardware and Abrasives group. Government technical data includes 13 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5325-01-558-6679 |
| Item Name | Stud Assembly,turnlock Fastener |
| FSC / FSG | 5325 / 53 — Fastening Devices |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-P-416,TY 2 CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Head Length | 0.850 INCHES MINIMUM AND 0.890 INCHES MAXIMUM IN |
| Eyelet Outside Diameter | 0.412 INCHES MINIMUM AND 0.427 INCHES MAXIMUM IN |
| Distance From Engaging Member to Largest Bearing Surface of Head | 0.533 INCHES MINIMUM AND 0.548 INCHES MAXIMUM IN |
| Turnlock Stud Head Style | FLAT COUNTERSUNK WING |
| Surface Treatment | CADMIUM OVERALL |
| Material | STEEL BARREL |
| Material | STEEL COMP 4037 STUD |
| Material | STEEL OVERALL |
| Material | STEEL EJECTOR SPRING |
| Material | STEEL PIN |
| Stud Assembly Style | STUD ASSEMBLY |
| Eyelet Length | 0.322 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 |
| Reference | Meaning |
|---|---|
| BACS21ED6W | 3/2 Design control — primary reference U.S. Government activity |
NSN 5325-01-558-6679 is a Stud Assembly,turnlock Fastener, classified under FSC 5325, Fastening Devices. Status: active.
Key specifications for 5325-01-558-6679: Surface Treatment Document and Classification: QQ-P-416,TY 2 CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Head Length: 0.850 INCHES MINIMUM AND 0.890 INCHES MAXIMUM IN; Eyelet Outside Diameter: 0.412 INCHES MINIMUM AND 0.427 INCHES MAXIMUM IN; Distance From Engaging Member to Largest Bearing Surface of Head: 0.533 INCHES MINIMUM AND 0.548 INCHES MAXIMUM IN. 13 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.