The Stud,locked in, cataloged under National Stock Number 5307-01-398-0331, is classified within Federal Supply Class 5307 (Studs) of the Hardware and Abrasives group. Government technical data includes 25 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 7 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5307-01-398-0331 |
| Item Name | Stud,locked in |
| FSC / FSG | 5307 / 53 — Studs |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES NUT THD |
| Surface Finish | 32.0 MICROINCHES SHANK |
| Surface Treatment Document and Classification | QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Distance From Serrated Portion to Nut End | 0.735 INCHES MINIMUM AND 0.765 INCHES MAXIMUM IN |
| Thread Length | 0.511 INCHES MINIMUM AND 0.551 INCHES MAXIMUM NUT THREAD B IN |
| Thread Length | 0.579 INCHES MINIMUM AND 0.609 INCHES MAXIMUM NUT THREAD A IN |
| Hardness Rating | 277.0 BRINELL HULTGREN NOMINAL |
| Style Designator | LOCKED IN |
| Material Document and Classification | AMS5731 ASSN STD SINGLE MATERIAL RESPONSE OR AMS5734 ASSN STD SINGLE MATERIAL RESPONSE |
| Distance From Serrated Portion to End of Stud Thread | 0.127 INCHES MINIMUM AND 0.157 INCHES MAXIMUM IN |
| Serration Included Angle | 85.0 DEGREES MINIMUM AND 88.0 DEGREES MAXIMUM |
| Thread Direction | RIGHT-HAND NUT THREAD A |
| Thread Direction | RIGHT-HAND NUT THREAD B |
| Nominal Thread Size | 0.375 INCHES NUT THREAD B IN |
| Nominal Thread Size | 0.250 INCHES NUT THREAD A IN |
| Distance From Serrated Portion to Stud End | 0.653 INCHES MINIMUM AND 0.693 INCHES MAXIMUM IN |
| Locking Feature | RING, LOCK SERRATED |
| Surface Treatment | PASSIVATE OVERALL |
| Thread Class | 3A NUT THREAD B A |
| Thread Class | 3A NUT THREAD A A |
| Thread Quantity Per Inch | 16 NUT THREAD B |
| Thread Quantity Per Inch | 28 NUT THREAD A |
| Material | IRON ALLOY 660 |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) NUT THREAD B |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) NUT THREAD A |
| 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 |
|---|---|
| MIL-S-45909 | 4/1 Identification reference U.S. Government activity |
| MS51992C803-12 | 2/2 Government specification standardization U.S. Government activity |
NSN 5307-01-398-0331 is a Stud,locked in, classified under FSC 5307, Studs. Status: active.
7 possible matches (shared part number, not a government interchangeability claim): 5307-01-398-0332, 5307-01-398-0334, 5307-01-398-0335. Verify interchangeability with system specifications before substitution.
Key specifications for 5307-01-398-0331: Surface Finish: 32.0 MICROINCHES NUT THD; Surface Finish: 32.0 MICROINCHES SHANK; Surface Treatment Document and Classification: QQ-P-35 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Distance From Serrated Portion to Nut End: 0.735 INCHES MINIMUM AND 0.765 INCHES MAXIMUM IN. 25 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.