The Bolt,machine, cataloged under National Stock Number 5306-01-139-6057, 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 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-139-6057 |
| Primary Part Number | 12270459 |
| Item Name | Bolt,machine |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | U S Army Tank Automotive Command Amsta-Im-Mm |
| Status | ACTIVE |
| Head Height | 0.378 INCHES MINIMUM AND 0.378 INCHES MINIMUM AND 0.403 INCHES MAXIMUM0.403 INCHES MAXIMUM IN |
| Fastener Length | 1.688 INCHES MINIMUM AND 1.688 INCHES MINIMUM AND 1.750 INCHES MAXIMUM1.750 INCHES MAXIMUM IN |
| Surface Treatment Document and Classification | MIL-P-16232 TY M CL 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALLMIL-P-16232 TY M CL 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL |
| Thread Length | 1.440 INCHES MINIMUM AND 1.440 INCHES MINIMUM AND 1.560 INCHES MAXIMUM1.560 INCHES MAXIMUM IN |
| Hardness Rating | 32.0 ROCKWELL C MINIMUM AND 32.0 ROCKWELL C MINIMUM AND 38.0 ROCKWELL C MAXIMUM OVERALL38.0 ROCKWELL C MAXIMUM OVERALL |
| Material Document and Classification | ASTM A322 ASSN STD 1ST MATERIAL RESPONSE OR ASTM A322 ASSN STD 1ST MATERIAL RESPONSE OR ASTM A331 ASSN STD 2ND MATERIAL RESPONSE OVERALLASTM A331 ASSN STD 2ND MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.625 INCHES0.625 INCHES IN |
| Features Provided | FINISHED HEADFINISHED HEAD |
| Head Style | HEXAGONHEXAGON |
| Thread Direction | RIGHT-HANDRIGHT-HAND |
| Grip Length | 0.250 INCHES NOMINAL0.250 INCHES NOMINAL IN |
| Width Between Flats | 0.923 INCHES MINIMUM AND 0.923 INCHES MINIMUM AND 0.938 INCHES MAXIMUM0.938 INCHES MAXIMUM IN |
| Surface Treatment | PHOSPHATE OVERALLPHOSPHATE OVERALL |
| Thread Class | 2A2A |
| Thread Quantity Per Inch | 1111 |
| Material | STEEL COMP 4140 OR STEEL COMP 8640 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL COARSE (UNC)UNIFIED NATIONAL COARSE (UNC) |
| 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 |
|---|---|
| 12270459 PRIMARY | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
NSN 5306-01-139-6057 is a Bolt,machine, manufactured by U S Army Tank Automotive Command Amsta-Im-Mm, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-139-6057 has 1 manufacturer part number on file: 12270459 (U S Army Tank Automotive Command Amsta-Im-Mm).
Key specifications for 12270459: Head Height: 0.378 INCHES MINIMUM AND 0.378 INCHES MINIMUM AND 0.403 INCHES MAXIMUM0.403 INCHES MAXIMUM IN; Fastener Length: 1.688 INCHES MINIMUM AND 1.688 INCHES MINIMUM AND 1.750 INCHES MAXIMUM1.750 INCHES MAXIMUM IN; Surface Treatment Document and Classification: MIL-P-16232 TY M CL 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALLMIL-P-16232 TY M CL 2 MIL SPEC SINGLE TREATMENT RESPONSE OVERALL; Thread Length: 1.440 INCHES MINIMUM AND 1.440 INCHES MINIMUM AND 1.560 INCHES MAXIMUM1.560 INCHES MAXIMUM 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.