The Stud,turnlock Fastener, cataloged under National Stock Number 5325-01-173-3772, is classified within Federal Supply Class 5325 (Fastening Devices) of the Hardware and Abrasives group. The manufacturer of record is Northrop Grumman Systems Corporation. Government technical data includes 13 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5325-01-173-3772 |
| Primary Part Number | GS520B7-27W |
| Item Name | Stud,turnlock Fastener |
| FSC / FSG | 5325 / 53 — Fastening Devices |
| Manufacturer | Northrop Grumman Systems Corporation |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-P-416,TY 1,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Head Length | 0.865 INCHES MINIMUM AND 0.875 INCHES MAXIMUM IN |
| Material Accommodated Thickness | 0.241 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN |
| Turnlock Stud Shank Style | STUD SHANK |
| Material Document and Classification | SAE 2317 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Stud Head Height | 0.312 INCHES NOMINAL IN |
| Shank Neck Length | 0.360 INCHES MINIMUM IN |
| Securing Device Type | RING |
| Turnlock Stud Head Style | FILLISTER WING |
| Stud Shank Major Diameter | 0.212 INCHES MINIMUM AND 0.217 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM OVERALL |
| Material | STEEL OVERALL |
| Grip Length | 0.490 INCHES MINIMUM AND 0.510 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 |
|---|---|
| 2351-20-27-C3C | Southco Inc (USA) |
| GS520B7-27W PRIMARY | Northrop Grumman Systems Corporation (USA) |
| Reference | Meaning |
|---|---|
| 5325PL1991957 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| A35T26 | 5/9 Secondary reference Southco Inc |
| A3.5T26 | 5/9 Secondary reference Southco Inc |
NSN 5325-01-173-3772 is a Stud,turnlock Fastener, manufactured by Northrop Grumman Systems Corporation, classified under FSC 5325, Fastening Devices. Status: active.
NSN 5325-01-173-3772 has 2 manufacturer part numbers on file: 2351-20-27-C3C (Southco Inc), GS520B7-27W (Northrop Grumman Systems Corporation).
Key specifications for GS520B7-27W: Surface Treatment Document and Classification: QQ-P-416,TY 1,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Head Length: 0.865 INCHES MINIMUM AND 0.875 INCHES MAXIMUM IN; Material Accommodated Thickness: 0.241 INCHES MINIMUM AND 0.270 INCHES MAXIMUM IN; Turnlock Stud Shank Style: STUD SHANK. 13 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.