The Stud,turnlock Fastener, cataloged under National Stock Number 5325-00-437-8962, is classified within Federal Supply Class 5325 (Fastening Devices) of the Hardware and Abrasives group. The manufacturer of record is Southco Inc. 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through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5325-00-437-8962 |
| Primary Part Number | F35T21 |
| Item Name | Stud,turnlock Fastener |
| FSC / FSG | 5325 / 53 — Fastening Devices |
| Manufacturer | Southco Inc |
| Status | ACTIVE |
| Surface Treatment Document and Classification | QQ-P-416,TY 1 CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Drive Type | SLOTTED |
| Material Accommodated Thickness | 0.181 INCHES MINIMUM AND 0.190 INCHES MAXIMUM IN |
| Turnlock Stud Shank Style | STUD SHANK |
| Material Document and Classification | SAE 2317 ASSN STD 1ST MATERIAL RESPONSE OR AISI FED SPEC 2ND MATERIAL RESPONSE OVERALL |
| Diameter | 0.370 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN |
| Shank Neck Length | 0.290 INCHES NOMINAL IN |
| Nondefinitive Spec/std Data | 1 TYPE AND A CLASS AND B CLASS AND 1 STYLE AND 2 SIZE |
| Turnlock Stud Head Style | FLAT COUNTERSUNK |
| Stud Shank Major Diameter | 0.212 INCHES MINIMUM AND 0.217 INCHES MAXIMUM IN |
| Surface Treatment | CADMIUM OVERALL |
| Material | STEEL OR STEEL COMP 8620 OVERALL |
| Grip Length | 0.420 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 |
|---|---|
| GS520C7-19 | Northrop Grumman Systems Corporation (USA) |
| F35T21 PRIMARY | Southco Inc (USA) |
| Reference | Meaning |
|---|---|
| F3.5T21 | 5/9 Secondary reference Southco Inc |
| 50-007F19 | 5/2 Secondary reference U.S. Government activity |
| F3-1-2T19 | C/1 Advisory reference — outside the item-of-supply concept Southco Inc |
| MIL-F-5591 | 3/1 Design control — primary reference U.S. Government activity |
| MIL-F-5591 | 5/9 Secondary reference U.S. Government activity |
| F3 1/2T19 | 5/9 Secondary reference Southco Inc |
NSN 5325-00-437-8962 is a Stud,turnlock Fastener, manufactured by Southco Inc, classified under FSC 5325, Fastening Devices. Status: active.
NSN 5325-00-437-8962 has 2 manufacturer part numbers on file: GS520C7-19 (Northrop Grumman Systems Corporation), F35T21 (Southco Inc).
Key specifications for F35T21: Surface Treatment Document and Classification: QQ-P-416,TY 1 CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Drive Type: SLOTTED; Material Accommodated Thickness: 0.181 INCHES MINIMUM AND 0.190 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.