The Stud,recessed and Stepped, cataloged under National Stock Number 5307-00-208-5643, is classified within Federal Supply Class 5307 (Studs) of the Hardware and Abrasives group. Government technical data includes 15 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5307-00-208-5643 |
| Item Name | Stud,recessed and Stepped |
| FSC / FSG | 5307 / 53 — Studs |
| Status | ACTIVE |
| Thread Length | 0.625 INCHES MINIMUM NUT THREAD IN |
| Thread Length | 0.750 INCHES MINIMUM STUD THREAD IN |
| Hardness Rating | 26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM |
| Material Document and Classification | AMS 6320 ASSN STD SINGLE MATERIAL RESPONSE |
| Diameter of Recessed Portion of Shank | 0.229 INCHES MINIMUM AND 0.233 INCHES MAXIMUM IN |
| Nominal Thread Size | 0.312 INCHES NUT THREAD IN |
| Nominal Thread Size | 0.375 INCHES STUD THREAD IN |
| Surface Treatment | CADMIUM OVERALL |
| Thread Class | 3A NUT THREAD A |
| Thread Quantity Per Inch | 24 NUT THREAD |
| Thread Quantity Per Inch | 16 STUD THREAD |
| Material | STEEL COMP 8735 |
| Distance Across Flats | 0.250 INCHES NOMINAL IN |
| Thread Series Designator | UNF NUT THREAD |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) STUD THREAD |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| AN167628 | 2/2 Government specification standardization U.S. Government activity |
NSN 5307-00-208-5643 is a Stud,recessed and Stepped, classified under FSC 5307, Studs. Status: active.
Key specifications for 5307-00-208-5643: Thread Length: 0.625 INCHES MINIMUM NUT THREAD IN; Thread Length: 0.750 INCHES MINIMUM STUD THREAD IN; Hardness Rating: 26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM; Material Document and Classification: AMS 6320 ASSN STD SINGLE MATERIAL RESPONSE. 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.