The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-047-0374, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Huck International, Inc. Government technical data includes 15 specifications, cited from the U.S. Government catalog. The record lists 5 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5306-01-047-0374 |
| Primary Part Number | ST3M729-8D48 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Huck International, Inc |
| Status | ACTIVE |
| Head Height | 0.271 INCHES MINIMUM AND 0.291 INCHES MAXIMUM IN |
| Fastener Length | 3.437 INCHES MINIMUM AND 3.484 INCHES MAXIMUM IN |
| Thread Length | 0.427 INCHES MINIMUM AND 0.494 INCHES MAXIMUM IN |
| Shank Unthreaded Hole Diameter | 0.106 INCHES MINIMUM AND 0.111 INCHES MAXIMUM FIRST HOLE IN |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Head Style | DOUBLE HEXAGON |
| Thread Direction | RIGHT-HAND |
| Grip Length | 2.990 INCHES MINIMUM AND 3.010 INCHES MAXIMUM IN |
| Width Between Flats | 0.741 INCHES MINIMUM AND 0.752 INCHES MAXIMUM IN |
| Grip Diameter | 0.4990 INCHES MINIMUM AND 0.4995 INCHES MAXIMUM IN |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 20 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 3.302 INCHES MINIMUM AND 3.369 INCHES MAXIMUM FIRST HOLE 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 |
|---|---|
| ST3M729-8D48 PRIMARY | Huck International, Inc (USA) |
| ST3M729-8D48 PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| MB145-8D48 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| MB145-8D48 | Hi-Shear Corporation (USA) |
| ST3M729-8D48 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| Reference | Meaning |
|---|---|
| ST3M729-8D48 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| ST3M729-8D48 | 5/2 Secondary reference U.S. Government activity |
| ST3M729-8D48 | 5/9 Secondary reference U.S. Government activity |
| ST3M729-8D48 | 5/2 Secondary reference U.S. Government activity |
NSN 5306-01-047-0374 is a Bolt,close Tolerance, manufactured by Huck International, Inc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-047-0374 has 5 manufacturer part numbers on file: ST3M729-8D48 (Huck International, Inc), ST3M729-8D48 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), MB145-8D48 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), MB145-8D48 (Hi-Shear Corporation), ST3M729-8D48 (Valley-Todeco, Inc. Dba Arconic Fastening Systems).
Key specifications for ST3M729-8D48: Head Height: 0.271 INCHES MINIMUM AND 0.291 INCHES MAXIMUM IN; Fastener Length: 3.437 INCHES MINIMUM AND 3.484 INCHES MAXIMUM IN; Thread Length: 0.427 INCHES MINIMUM AND 0.494 INCHES MAXIMUM IN; Shank Unthreaded Hole Diameter: 0.106 INCHES MINIMUM AND 0.111 INCHES MAXIMUM FIRST HOLE IN. 15 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.