The Bolt,machine, cataloged under National Stock Number 5306-01-666-6678, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Huck Fasteners Dba Huck Intl Inc. Government technical data includes 9 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-666-6678 |
| Primary Part Number | MHSF-DT16-20D1 |
| Item Name | Bolt,machine |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Huck Fasteners Dba Huck Intl Inc |
| Status | ACTIVE |
| Head Height | 15.1 MILLIMETERS MAXIMUM MM |
| Fastener Length | 69.54 MILLIMETERS NOMINAL MM |
| Extended Washer Diameter | 32.8 MILLIMETERS MAXIMUM MM |
| Thread Length | 55.54 MILLIMETERS NOMINAL MM |
| Material Document and Classification | SAE 5135 INTERNATIONAL STD/SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Head Style | CHAMFER FLANGE |
| Thread Direction | RIGHT-HAND |
| Width Between Flats | 20.48 MILLIMETERS MINIMUM AND 21.00 MILLIMETERS MAXIMUM MM |
| Material | STEEL COMP 5135 OVERALL |
| 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 |
|---|---|
| MHSF-DT16-20D1 PRIMARY | Huck Fasteners Dba Huck Intl Inc (USA) |
| 12422435-006 | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| Reference | Meaning |
|---|---|
| 12422435 | D/9 Drawing number reference only U S Army Tank Automotive Command Amsta-Im-Mm |
NSN 5306-01-666-6678 is a Bolt,machine, manufactured by Huck Fasteners Dba Huck Intl Inc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-666-6678 has 2 manufacturer part numbers on file: MHSF-DT16-20D1 (Huck Fasteners Dba Huck Intl Inc), 12422435-006 (U S Army Tank Automotive Command Amsta-Im-Mm).
1 possible match (shared part number, not a government interchangeability claim): 5306-01-666-6746. Verify interchangeability with system specifications before substitution.
Key specifications for MHSF-DT16-20D1: Head Height: 15.1 MILLIMETERS MAXIMUM MM; Fastener Length: 69.54 MILLIMETERS NOMINAL MM; Extended Washer Diameter: 32.8 MILLIMETERS MAXIMUM MM; Thread Length: 55.54 MILLIMETERS NOMINAL MM. 9 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.