The Screw,cap,socket Head, cataloged under National Stock Number 5305-01-378-8129, is classified within Federal Supply Class 5305 (Screws) of the Hardware and Abrasives group. The manufacturer of record is U S Army Tank Automotive Command Amsta-Im-Mm. Government technical data includes 22 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5305-01-378-8129 |
| Primary Part Number | 12387270-99 |
| Item Name | Screw,cap,socket Head |
| FSC / FSG | 5305 / 53 — Screws |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Surface Finish | 32.0 MICROINCHES THREADS |
| Surface Finish | 32.0 MICROINCHES BEARING SURFACE OF HEAD |
| Surface Finish | 32.0 MICROINCHES FASTENER |
| Width Across Flats | 0.312 INCHES MINIMUM AND 0.316 INCHES MAXIMUM IN |
| Head Height | 0.368 INCHES MINIMUM AND 0.375 INCHES MAXIMUM IN |
| Fastener Length | 0.969 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | A000 FED STD 3RD TREATMENT RESPONSE AND A000 FED STD 10TH TREATMENT RESPONSE OVERALL |
| Thread Length | 0.875 INCHES MINIMUM AND 1.000 INCHES MAXIMUM IN |
| Hardness Rating | 39.0 ROCKWELL C MINIMUM AND 45.0 ROCKWELL C MAXIMUM OVERALL |
| Material Document and Classification | FED 66 FED STD ALL MATERIAL RESPONSES OVERALL |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | FLAT CHAMFER |
| Thread Direction | RIGHT-HAND |
| Color | BRONZE OR OLIVE DRAB OVERALL |
| Surface Treatment | CADMIUM AND CHROMATE OVERALL |
| Minimum Tensile Strength | 160000 POUNDS PER SQUARE INCH LBS |
| Internal Drive Style | HEXAGON |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 16 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC) |
| Head Diameter | 0.550 INCHES MINIMUM AND 0.562 INCHES MAXIMUM IN |
| 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 |
|---|---|
| LS1091335-99 | General Dynamics Land Systems Inc. (USA) |
| 12387270-99 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| Reference | Meaning |
|---|---|
| 5305013788129 | 6/9 Informative reference only E.c.a Etablissement Central Des Approvisionnements Des Forces Armees Royales |
NSN 5305-01-378-8129 is a Screw,cap,socket Head, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 5305, Screws. Status: active.
NSN 5305-01-378-8129 has 2 manufacturer part numbers on file: LS1091335-99 (General Dynamics Land Systems Inc.), 12387270-99 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 12387270-99: Surface Finish: 32.0 MICROINCHES THREADS; Surface Finish: 32.0 MICROINCHES BEARING SURFACE OF HEAD; Surface Finish: 32.0 MICROINCHES FASTENER; Width Across Flats: 0.312 INCHES MINIMUM AND 0.316 INCHES MAXIMUM IN. 22 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.