The Stud,locked in, cataloged under National Stock Number 5307-00-006-3215, is classified within Federal Supply Class 5307 (Studs) of the Hardware and Abrasives group. The manufacturer of record is Sae International Dba Sae International. Government technical data includes 25 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5307-00-006-3215 |
| Primary Part Number | MS51989-105-20 |
| Item Name | Stud,locked in |
| FSC / FSG | 5307 / 53 — Studs |
| Manufacturer | Sae International Dba Sae International |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES NUT THD |
| Surface Treatment Document and Classification | QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Distance From Serrated Portion to Nut End | 1.235 INCHES MINIMUM AND 1.265 INCHES MAXIMUM IN |
| Thread Length | 0.485 INCHES MINIMUM AND 0.515 INCHES MAXIMUM NUT THREAD IN |
| Thread Length | 0.375 INCHES MINIMUM AND 0.405 INCHES MAXIMUM STUD THREAD IN |
| Hardness Rating | 26.0 ROCKWELL C MINIMUM |
| Style Designator | LOCKED IN |
| Thread Pitch Diameters | +0.2778 TO 0.2795 INCHES STUD THREAD IN |
| Material Document and Classification | MIL-S-6758 MIL SPEC SINGLE MATERIAL RESPONSE |
| Distance From Serrated Portion to End of Stud Thread | 0.140 INCHES MINIMUM AND 0.200 INCHES MAXIMUM IN |
| Serration Included Angle | 86.0 DEGREES NOMINAL |
| Thread Direction | RIGHT-HAND STUD THREAD |
| Thread Direction | RIGHT-HAND NUT THREAD |
| Nominal Thread Size | 0.250 INCHES NUT THREAD IN |
| Nominal Thread Size | 0.312 INCHES STUD THREAD IN |
| Distance From Serrated Portion to Stud End | 0.545 INCHES MINIMUM AND 0.575 INCHES MAXIMUM IN |
| Locking Feature | RING, LOCK SERRATED |
| Serration Quantity | 17 |
| Surface Treatment | CADMIUM OVERALL |
| Thread Class | 3A NUT THREAD A |
| Thread Quantity Per Inch | 18 STUD THREAD |
| Thread Quantity Per Inch | 28 NUT THREAD |
| Material | STEEL COMP 4130 |
| 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 |
| Part Number | Manufacturer |
|---|---|
| MS51989-105-20 PRIMARY | Sae International Dba Sae International (USA) |
| Reference | Meaning |
|---|---|
| MS51989-105-20 | 3/9 Design control — primary reference U.S. Government activity |
| MS51989-105-20 | 5/9 Secondary reference U.S. Government activity |
NSN 5307-00-006-3215 is a Stud,locked in, manufactured by Sae International Dba Sae International, classified under FSC 5307, Studs. Status: active.
NSN 5307-00-006-3215 has 1 manufacturer part number on file: MS51989-105-20 (Sae International Dba Sae International).
Key specifications for MS51989-105-20: Surface Finish: 32.0 MICROINCHES NUT THD; Surface Treatment Document and Classification: QQ-P-416,TY 2,CL 3 FED SPEC SINGLE TREATMENT RESPONSE OVERALL; Distance From Serrated Portion to Nut End: 1.235 INCHES MINIMUM AND 1.265 INCHES MAXIMUM IN; Thread Length: 0.485 INCHES MINIMUM AND 0.515 INCHES MAXIMUM NUT THREAD 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.