The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-682-2448, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Huck International, Inc. The record lists 8 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-682-2448 |
| Primary Part Number | ST3M729-4D21 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Huck International, Inc |
| Status | ACTIVE |
| 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 |
|---|---|
| ST3M729-4D21 | Huck International, Inc (USA) |
| ST3M729-4D21 | Heartland Precision Fasteners Inc (USA) |
| ST3M729-4D21 | Howmet Global Fastening Systems Inc (USA) |
| ST3M729-4D21 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| ST3M729-4D21 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| ST3M729-4D21 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| ST3M729-4D21 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| ST3M729-4D21 | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| MB145-4-D-21 | 3/9 Design control — primary reference Hi-Shear Corporation |
| WC729-4D21 | 5/9 Secondary reference West Coast Aerospace, Inc. |
| 11933-4D21 | 5/9 Secondary reference Reid Products Inc. Dba Reid Products Inc |
| ST3M729-4D21 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
NSN 5306-01-682-2448 is a Bolt,close Tolerance, manufactured by Huck International, Inc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-682-2448 has 8 manufacturer part numbers on file: ST3M729-4D21 (Huck International, Inc), ST3M729-4D21 (Heartland Precision Fasteners Inc), ST3M729-4D21 (Howmet Global Fastening Systems Inc), ST3M729-4D21 (Fastener Innovation Technology, Inc. Dba F I T), ST3M729-4D21 (Valley-Todeco, Inc. Dba Arconic Fastening Systems) and 3 more.
Key specifications for ST3M729-4D21: End Item Identification: F-15SA. 0 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.