The Stud,turnlock Fastener, cataloged under National Stock Number 5325-01-249-3765, 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 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5325-01-249-3765 |
| Primary Part Number | CA1821-7B |
| 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-13924,CL 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Drive Type | CROSS RECESS |
| Turnlock Stud Shank Style | STUD SHANK |
| Extension Length | 0.190 INCHES NOMINAL IN |
| Material Document and Classification | ASTM A582 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Diameter | 0.357 INCHES MINIMUM AND 0.373 INCHES MAXIMUM IN |
| Turnlock Stud Head Style | FILLISTER |
| Stud Shank Major Diameter | 0.247 INCHES MINIMUM AND 0.249 INCHES MAXIMUM IN |
| Surface Treatment | OXIDE FILM OVERALL |
| Material | STEEL COMP 303 OVERALL |
| Stud Thread Size and Series/type Designator | 0.164-32 UNIFIED NATIONAL COARSE (UNC) |
| Grip Length | 0.810 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 |
|---|---|
| CA1821-7B PRIMARY | Howmet Global Fastening Systems Inc. Div Tridair Products (USA) |
| Reference | Meaning |
|---|---|
| 1166146-1 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 1166146-1 | 7/9 Vendor item drawing reference Bae Systems Information and Electronic Systems Integration I |
NSN 5325-01-249-3765 is a Stud,turnlock Fastener, manufactured by Howmet Global Fastening Systems Inc. Div Tridair Products, classified under FSC 5325, Fastening Devices. Status: active.
NSN 5325-01-249-3765 has 1 manufacturer part number on file: CA1821-7B (Howmet Global Fastening Systems Inc. Div Tridair Products).
Key specifications for CA1821-7B: Surface Treatment Document and Classification: MIL-C-13924,CL 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Drive Type: CROSS RECESS; Turnlock Stud Shank Style: STUD SHANK; Extension Length: 0.190 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.