The Bolt,machine, cataloged under National Stock Number 5306-00-528-7381, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is U S Army Tank Automotive Command Amsta-Im-Mm. 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-00-528-7381 |
| Primary Part Number | 5287381 |
| Item Name | Bolt,machine |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Head Height | 0.312 INCHES NOMINAL IN |
| Fastener Length | 0.796 INCHES MINIMUM AND 0.828 INCHES MAXIMUM IN |
| Thread Length | 0.656 INCHES MINIMUM AND 0.718 INCHES MAXIMUM IN |
| Hardness Rating | 26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL |
| Material Document and Classification | ASTM A108 ASSN STD 1ST MATERIAL RESPONSE OR ASTM A108 ASSN STD 2ND MATERIAL RESPONSE OR QQ-S-637 FED SPEC 3RD MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.438 INCHES IN |
| Features Provided | FINISHED HEAD |
| Head Style | HEXAGON COUNTERSUNK |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 0.609 INCHES MINIMUM AND 0.641 INCHES MAXIMUM IN |
| Nonstandard Thread Pitch Diameter | +0.4014 TO 0.4040 INCHES IN |
| Surface Treatment | CADMIUM OR ZINC OVERALL |
| Countersink Angle | 75.0 DEGREES NOMINAL |
| Thread Quantity Per Inch | 20 |
| Material | STEEL COMP 1035 OR STEEL COMP 1040 OR STEEL COMP 1137 OVERALL |
| Thread Series Designator | UNF |
| 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 |
|---|---|
| 5287381 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
NSN 5306-00-528-7381 is a Bolt,machine, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-528-7381 has 1 manufacturer part number on file: 5287381 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 5287381: Head Height: 0.312 INCHES NOMINAL IN; Fastener Length: 0.796 INCHES MINIMUM AND 0.828 INCHES MAXIMUM IN; Thread Length: 0.656 INCHES MINIMUM AND 0.718 INCHES MAXIMUM IN; Hardness Rating: 26.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MAXIMUM OVERALL. 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.