The Stud,locked in, cataloged under National Stock Number 5307-01-043-9674, 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 16 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5307-01-043-9674 |
| Primary Part Number | 877BT-4SB-45 |
| Item Name | Stud,locked in |
| FSC / FSG | 5307 / 53 — Studs |
| Manufacturer | Howmet Global Fastening Systems Inc. Div Microdot Products |
| Status | ACTIVE |
| Surface Finish | 125.0 MICROINCHES OVERALL |
| Thread Length | 0.490 INCHES MINIMUM AND 0.510 INCHES MAXIMUM NUT THREAD IN |
| Thread Length | 0.335 INCHES MINIMUM AND 0.365 INCHES MAXIMUM STUD THREAD IN |
| Material Document and Classification | AMS5504 ASSN STD SINGLE MATERIAL RESPONSE |
| 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 |
| Locking Feature | RING, LOCK KEYED |
| Thread Class | 3A NUT THREAD A |
| Thread Class | 3A STUD THREAD A |
| Thread Quantity Per Inch | 18 STUD THREAD |
| Thread Quantity Per Inch | 28 NUT THREAD |
| Material | STEEL CORROSION RESISTING |
| Thread Series Designator | UNJC NUT THREAD |
| Thread Series Designator | UNJC 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 |
|---|---|
| 877BT-4SB-45 PRIMARY | Howmet Global Fastening Systems Inc. Div Microdot Products (USA) |
| Reference | Meaning |
|---|---|
| 877BW-4SB-45 | 5/9 Secondary reference Stanley Engineered Fastening Llc |
| 877BT-4SB-45 | 5/9 Secondary reference Stanley Engineered Fastening Llc |
| 4059T25P01 | 1/2 Source control — Government-approved source U.S. Government activity |
NSN 5307-01-043-9674 is a Stud,locked in, manufactured by Howmet Global Fastening Systems Inc. Div Microdot Products, classified under FSC 5307, Studs. Status: active.
NSN 5307-01-043-9674 has 1 manufacturer part number on file: 877BT-4SB-45 (Howmet Global Fastening Systems Inc. Div Microdot Products).
Key specifications for 877BT-4SB-45: Surface Finish: 125.0 MICROINCHES OVERALL; Thread Length: 0.490 INCHES MINIMUM AND 0.510 INCHES MAXIMUM NUT THREAD IN; Thread Length: 0.335 INCHES MINIMUM AND 0.365 INCHES MAXIMUM STUD THREAD IN; Material Document and Classification: AMS5504 ASSN STD SINGLE MATERIAL RESPONSE. 16 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.