The Stud,turnlock Fastener, cataloged under National Stock Number 5325-01-412-6640, is classified within Federal Supply Class 5325 (Fastening Devices) of the Hardware and Abrasives group. Government technical data includes 8 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 5325-01-412-6640 |
| Item Name | Stud,turnlock Fastener |
| FSC / FSG | 5325 / 53 — Fastening Devices |
| Status | ACTIVE |
| Drive Type | SOCKET |
| Turnlock Stud Shank Style | STUD SHANK |
| Diameter | 0.490 INCHES NOMINAL IN |
| Turnlock Stud Head Style | FLAT COUNTERSUNK |
| Stud Shank Major Diameter | 0.374 INCHES NOMINAL IN |
| Material | STEEL CORROSION RESISTING OVERALL |
| Stud Thread Size and Series/type Designator | 0.2500-28-3B 4LEAD THREAD UNF |
| Grip Length | 0.281 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 |
|---|---|
| CA17227-4HS | 3/2 Design control — primary reference U.S. Government activity |
NSN 5325-01-412-6640 is a Stud,turnlock Fastener, classified under FSC 5325, Fastening Devices. Status: active.
Key specifications for 5325-01-412-6640: Drive Type: SOCKET; Turnlock Stud Shank Style: STUD SHANK; Diameter: 0.490 INCHES NOMINAL IN; Turnlock Stud Head Style: FLAT COUNTERSUNK. 8 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.