The Stud,turnlock Fastener, cataloged under National Stock Number 5325-00-326-5331, is classified within Federal Supply Class 5325 (Fastening Devices) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company Div Defense. Government technical data includes 15 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through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5325-00-326-5331 |
| Primary Part Number | 3M303A4-2 |
| Item Name | Stud,turnlock Fastener |
| FSC / FSG | 5325 / 53 — Fastening Devices |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Drive Type | SOCKET |
| Material Accommodated Thickness | 0.125 INCHES NOMINAL IN |
| Turnlock Stud Shank Style | STUD SHANK |
| Extension Length | 0.361 INCHES NOMINAL IN |
| Material Document and Classification | AMS 6322 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Diameter | 0.3464 INCHES MINIMUM AND 0.3553 INCHES MAXIMUM IN |
| Stud Head Height | 0.0194 INCHES MINIMUM AND 0.0240 INCHES MAXIMUM IN |
| Securing Device Type | RING |
| Turnlock Stud Head Style | FLAT FILLISTER |
| Stud Shank Major Diameter | 0.2485 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Material | STEEL COMP 8740 OVERALL |
| Stud Thread Size and Series/type Designator | 0.164-32 UNJC |
| Grip Length | 0.120 INCHES MINIMUM AND 0.130 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 |
|---|---|
| 3M303A4-2 | Howmet Global Fastening Systems Inc. Div Voi-Shan Products (USA) |
| 3M303A4-2 PRIMARY | The Boeing Company Div Defense (USA) |
| 3M303A4-2 | Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok (USA) |
| Reference | Meaning |
|---|---|
| 01926-4-2 | 5/9 Secondary reference U.S. Government activity |
| 3M303-4-2 | 5/9 Secondary reference The Boeing Company Div Defense |
| 3M303A4-2 | 5/2 Secondary reference U.S. Government activity |
| 3M303A4-2 | 5/2 Secondary reference U.S. Government activity |
| 1926-4-2 | 5/9 Secondary reference U.S. Government activity |
| M1926-4-2 | 5/9 Secondary reference Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok |
| 01926-4-2 | 5/9 Secondary reference U.S. Government activity |
NSN 5325-00-326-5331 is a Stud,turnlock Fastener, manufactured by The Boeing Company Div Defense, classified under FSC 5325, Fastening Devices. Status: active.
NSN 5325-00-326-5331 has 3 manufacturer part numbers on file: 3M303A4-2 (Howmet Global Fastening Systems Inc. Div Voi-Shan Products), 3M303A4-2 (The Boeing Company Div Defense), 3M303A4-2 (Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok).
Key specifications for 3M303A4-2: Surface Treatment Document and Classification: QQ-P-416,TY 2,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Drive Type: SOCKET; Material Accommodated Thickness: 0.125 INCHES NOMINAL IN; Turnlock Stud Shank Style: STUD SHANK. 15 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.