The Stud,locked in, cataloged under National Stock Number 5307-01-007-0548, is classified within Federal Supply Class 5307 (Studs) of the Hardware and Abrasives group. The manufacturer of record is Howmet Global Fastening Systems Inc. Government technical data includes 12 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5307-01-007-0548 |
| Primary Part Number | SFJ81-6SM6A |
| Item Name | Stud,locked in |
| FSC / FSG | 5307 / 53 — Studs |
| Manufacturer | Howmet Global Fastening Systems Inc |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES NUT THD |
| Distance From Serrated Portion to Nut End | 0.360 INCHES MINIMUM AND 0.390 INCHES MAXIMUM IN |
| Thread Length | 0.360 INCHES MINIMUM AND 0.390 INCHES MAXIMUM NUT THREAD IN |
| Thread Length | 0.132 INCHES MINIMUM AND 0.245 INCHES MAXIMUM STUD THREAD IN |
| Style Designator | LOCKED IN |
| Thread Pitch Diameters | +0.1639 TO 0.1654 INCHES STUD THREAD IN |
| Distance From Serrated Portion to End of Stud Thread | 0.120 INCHES MINIMUM AND 0.180 INCHES MAXIMUM IN |
| Thread Direction | RIGHT-HAND STUD THREAD |
| Thread Direction | RIGHT-HAND NUT THREAD |
| Distance From Serrated Portion to Stud End | 0.365 INCHES MINIMUM AND 0.395 INCHES MAXIMUM IN |
| Locking Feature | HEAD SERRATIONS |
| Thread Class | 3A 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 |
| Part Number | Manufacturer |
|---|---|
| SFJ81-6SM6A PRIMARY | Howmet Global Fastening Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| 4038T93P02 | 5/2 Secondary reference U.S. Government activity |
| SFJ81-6SM6A | 5/2 Secondary reference U.S. Government activity |
| 4038T93P02 | 1/2 Source control — Government-approved source U.S. Government activity |
NSN 5307-01-007-0548 is a Stud,locked in, manufactured by Howmet Global Fastening Systems Inc, classified under FSC 5307, Studs. Status: active.
NSN 5307-01-007-0548 has 1 manufacturer part number on file: SFJ81-6SM6A (Howmet Global Fastening Systems Inc).
Key specifications for SFJ81-6SM6A: Surface Finish: 32.0 MICROINCHES NUT THD; Distance From Serrated Portion to Nut End: 0.360 INCHES MINIMUM AND 0.390 INCHES MAXIMUM IN; Thread Length: 0.360 INCHES MINIMUM AND 0.390 INCHES MAXIMUM NUT THREAD IN; Thread Length: 0.132 INCHES MINIMUM AND 0.245 INCHES MAXIMUM STUD THREAD IN. 12 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.