The Stud,turnlock Fastener, cataloged under National Stock Number 5325-01-516-3175, 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 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5325-01-516-3175 |
| Primary Part Number | GS520B12-29 |
| 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, TYPE 1, CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Drive Type | SLOTTED |
| Turnlock Stud Shank Style | STUD SHANK |
| Material Document and Classification | SAE J778-2317 ASSN STD SINGLE MATERIAL RESPONSE OR AISI 8620 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Diameter | 0.620 INCHES MINIMUM AND 0.625 INCHES MAXIMUM IN |
| Shank Neck Length | 0.420 INCHES MINIMUM AND 0.440 INCHES MAXIMUM IN |
| Turnlock Stud Head Style | FILLISTER |
| Stud Shank Major Diameter | 0.369 INCHES MINIMUM AND 0.374 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM OVERALL |
| Material | STEEL COMP 2317 OR STEEL COMP 8620 OVERALL |
| Grip Length | 0.640 INCHES MINIMUM AND 0.660 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 |
|---|---|
| GS520B12-29 PRIMARY | Northrop Grumman Systems Corporation (USA) |
NSN 5325-01-516-3175 is a Stud,turnlock Fastener, manufactured by Northrop Grumman Systems Corporation, classified under FSC 5325, Fastening Devices. Status: active.
NSN 5325-01-516-3175 has 1 manufacturer part number on file: GS520B12-29 (Northrop Grumman Systems Corporation).
Key specifications for GS520B12-29: Surface Treatment Document and Classification: QQ-P-416, TYPE 1, CLASS 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Drive Type: SLOTTED; Turnlock Stud Shank Style: STUD SHANK; Material Document and Classification: SAE J778-2317 ASSN STD SINGLE MATERIAL RESPONSE OR AISI 8620 ASSN STD SINGLE MATERIAL RESPONSE OVERALL. 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.