The Stud,turnlock Fastener, cataloged under National Stock Number 5325-01-240-7487, 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 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5325-01-240-7487 |
| Primary Part Number | 3M1055C5A8 |
| Item Name | Stud,turnlock Fastener |
| FSC / FSG | 5325 / 53 — Fastening Devices |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Drive Type | SOCKET |
| Material Accommodated Thickness | 0.376 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN |
| Turnlock Stud Shank Style | STUD SHANK |
| Extension Length | 0.064 INCHES MAXIMUM IN |
| Material Document and Classification | 23-107,CAGEC 76301 MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| Diameter | 0.394 INCHES MINIMUM IN |
| Turnlock Stud Head Style | FLAT COUNTERSUNK |
| Stud Shank Major Diameter | 0.311 INCHES MINIMUM AND 0.312 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Material | STEEL CORROSION RESISTING OVERALL |
| Stud Thread Size and Series/type Designator | 0.190-32 UNIFIED NATIONAL JOINT FINE (UNJF) |
| Grip Length | 0.851 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 |
|---|---|
| 3M1055C5A8 PRIMARY | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| 3223S5-8 | 5/2 Secondary reference U.S. Government activity |
| 3220S5-8 | 5/9 Secondary reference U.S. Government activity |
| 3M1055C5B-8 | 5/9 Secondary reference The Boeing Company Div Defense |
| 3223S5-8 | 5/9 Secondary reference U.S. Government activity |
| 3220S5-8 | 5/9 Secondary reference U.S. Government activity |
| 3M1055C5A8 | 5/2 Secondary reference U.S. Government activity |
NSN 5325-01-240-7487 is a Stud,turnlock Fastener, manufactured by The Boeing Company Div Defense, classified under FSC 5325, Fastening Devices. Status: active.
NSN 5325-01-240-7487 has 1 manufacturer part number on file: 3M1055C5A8 (The Boeing Company Div Defense).
Key specifications for 3M1055C5A8: Drive Type: SOCKET; Material Accommodated Thickness: 0.376 INCHES MINIMUM AND 0.500 INCHES MAXIMUM IN; Turnlock Stud Shank Style: STUD SHANK; Extension Length: 0.064 INCHES MAXIMUM 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.