The Stud,locked in, cataloged under National Stock Number 5307-00-809-3951, is classified within Federal Supply Class 5307 (Studs) of the Hardware and Abrasives group. The manufacturer of record is Howmet Global Fastening Systems Inc. Div Microdot Products. Government technical data includes 17 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5307-00-809-3951 |
| Primary Part Number | 878B-6MC-12 |
| Item Name | Stud,locked in |
| FSC / FSG | 5307 / 53 — Studs |
| Manufacturer | Howmet Global Fastening Systems Inc. Div Microdot Products |
| Status | ACTIVE |
| Distance From Serrated Portion to Nut End | 1.250 INCHES NOMINAL IN |
| Thread Length | 0.510 INCHES NOMINAL STUD THREAD IN |
| Thread Length | 0.625 INCHES NOMINAL NUT THREAD IN |
| Style Designator | LOCKED IN |
| Material Document and Classification | MIL-S-5626 MIL SPEC SINGLE MATERIAL RESPONSE |
| Distance From Serrated Portion to End of Stud Thread | 0.052 INCHES NOMINAL IN |
| Thread Direction | RIGHT-HAND STUD THREAD |
| Thread Direction | RIGHT-HAND NUT THREAD |
| Nominal Thread Size | 0.625 INCHES STUD THREAD IN |
| Distance From Serrated Portion to Stud End | 0.562 INCHES NOMINAL IN |
| Locking Feature | RING, LOCK SERRATED |
| Surface Treatment | CADMIUM OVERALL |
| Thread Class | 3A NUT THREAD A |
| Thread Class | 3A STUD THREAD A |
| Thread Quantity Per Inch | 11 STUD THREAD |
| Material | STEEL COMP 4140 |
| 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 |
|---|---|
| 878B-6MC-12 PRIMARY | Howmet Global Fastening Systems Inc. Div Microdot Products (USA) |
| Reference | Meaning |
|---|---|
| 878B-6MC-12 | 5/9 Secondary reference Stanley Engineered Fastening Llc |
| S2610-6A920A | 5/9 Secondary reference Stanley Engineered Fastening Llc |
NSN 5307-00-809-3951 is a Stud,locked in, manufactured by Howmet Global Fastening Systems Inc. Div Microdot Products, classified under FSC 5307, Studs. Status: active.
NSN 5307-00-809-3951 has 1 manufacturer part number on file: 878B-6MC-12 (Howmet Global Fastening Systems Inc. Div Microdot Products).
Key specifications for 878B-6MC-12: Distance From Serrated Portion to Nut End: 1.250 INCHES NOMINAL IN; Thread Length: 0.510 INCHES NOMINAL STUD THREAD IN; Thread Length: 0.625 INCHES NOMINAL NUT THREAD IN; Style Designator: LOCKED IN. 17 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.