The Stud,turnlock Fastener, cataloged under National Stock Number 5325-00-286-3770, is classified within Federal Supply Class 5325 (Fastening Devices) of the Hardware and Abrasives group. The manufacturer of record is Lockheed Martin Corporation Div Rms - Mitchel Field. Government technical data includes 11 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5325-00-286-3770 |
| Primary Part Number | 668343-025 |
| Item Name | Stud,turnlock Fastener |
| FSC / FSG | 5325 / 53 — Fastening Devices |
| Manufacturer | Lockheed Martin Corporation Div Rms - Mitchel Field |
| Status | ACTIVE |
| Head Length | 0.625 INCHES NOMINAL IN |
| Material Accommodated Thickness | 0.241 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN |
| Turnlock Stud Shank Style | STUD SHANK |
| Stud Head Height | 0.312 INCHES NOMINAL IN |
| Shank Neck Length | 0.330 INCHES NOMINAL IN |
| Nondefinitive Spec/std Data | 1 TYPE AND A CLASS AND B CLASS AND 3 TYPE AND 2 SIZE |
| Turnlock Stud Head Style | FILLISTER WING |
| Stud Shank Major Diameter | 0.217 INCHES NOMINAL IN |
| Surface Treatment | CADMIUM OVERALL |
| Material | STEEL CORROSION RESISTING OVERALL |
| Grip Length | 0.480 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 |
|---|---|
| 668343-025 PRIMARY | Lockheed Martin Corporation Div Rms - Mitchel Field (USA) |
| Reference | Meaning |
|---|---|
| MILF5591 | 5/9 Secondary reference U.S. Government activity |
| MIL-F-5591 | 3/1 Design control — primary reference U.S. Government activity |
NSN 5325-00-286-3770 is a Stud,turnlock Fastener, manufactured by Lockheed Martin Corporation Div Rms - Mitchel Field, classified under FSC 5325, Fastening Devices. Status: active.
NSN 5325-00-286-3770 has 1 manufacturer part number on file: 668343-025 (Lockheed Martin Corporation Div Rms - Mitchel Field).
Key specifications for 668343-025: Head Length: 0.625 INCHES NOMINAL IN; Material Accommodated Thickness: 0.241 INCHES MINIMUM AND 0.250 INCHES MAXIMUM IN; Turnlock Stud Shank Style: STUD SHANK; Stud Head Height: 0.312 INCHES NOMINAL IN. 11 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.