The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-027-6400, 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 17 specifications, cited from the U.S. Government catalog. The record lists 14 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-027-6400 |
| Primary Part Number | ST3M729-10D40 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Huck International, Inc |
| Status | ACTIVE |
| Head Height | 0.340 INCHES MINIMUM AND 0.360 INCHES MAXIMUM IN |
| Fastener Length | 3.027 INCHES MINIMUM AND 3.074 INCHES MAXIMUM IN |
| Thread Length | 0.517 INCHES MINIMUM AND 0.584 INCHES MAXIMUM IN |
| Shank Unthreaded Hole Diameter | 0.141 INCHES MINIMUM AND 0.146 INCHES MAXIMUM FIRST HOLE IN |
| Material Document and Classification | 23-112,MCDONNEL DOUGLAS CORP MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.625 INCHES IN |
| Head Style | DOUBLE HEXAGON |
| Thread Direction | RIGHT-HAND |
| Grip Length | 2.490 INCHES MINIMUM AND 2.510 INCHES MAXIMUM IN |
| Width Between Flats | 0.928 INCHES MINIMUM AND 0.940 INCHES MAXIMUM IN |
| Grip Diameter | 0.6235 INCHES MINIMUM AND 0.6240 INCHES MAXIMUM IN |
| Minimum Tensile Strength | 125000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 18 |
| Material | STEEL OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 2.893 INCHES MINIMUM AND 2.960 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 |
|---|---|
| ST3M729-10D40 | Reid Products Inc. Dba Reid Products Inc (USA) |
| ST3M729-10D40 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| ST3M729-10D40 | Howmet Global Fastening Systems Inc (USA) |
| ST3M729-10D40 | Hi-Shear Corporation (USA) |
| ST3M729-10D40 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| ST3M729-10D40 | Heartland Precision Fasteners Inc (USA) |
| ST3M729-10D40 | West Coast Aerospace, Inc. (USA) |
| ST3M729-10D40 | Houston Precision Fasteners I Lp (USA) |
| ST3M729-10D40 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M729-10D40 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| ST3M729-10D40 PRIMARY | Huck International, Inc (USA) |
| ST3M729-10D40 | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| ST3M729-10D40 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| ST3M729-10D40 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| Reference | Meaning |
|---|---|
| ST3M729-10D40 | 5/2 Secondary reference U.S. Government activity |
| ST3M729-10D40 | 5/2 Secondary reference U.S. Government activity |
| MB145-10D40 | 5/9 Secondary reference Hi-Shear Corporation |
| ST3M729-10D40 | 5/9 Secondary reference Sps Technologies, Llc Dba PB Fasteners |
| ST3M729-10D40 | 5/9 Secondary reference Sabre Machine and Tool Corp |
| ST3M729-10D40 | 5/9 Secondary reference U.S. Government activity |
| ST3M729-10D40 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
NSN 5306-01-027-6400 is a Bolt,close Tolerance, manufactured by Huck International, Inc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-027-6400 has 14 manufacturer part numbers on file: ST3M729-10D40 (Reid Products Inc. Dba Reid Products Inc), ST3M729-10D40 (Valley-Todeco, Inc. Dba Arconic Fastening Systems), ST3M729-10D40 (Howmet Global Fastening Systems Inc), ST3M729-10D40 (Hi-Shear Corporation), ST3M729-10D40 (Fastener Innovation Technology, Inc. Dba F I T) and 9 more.
Key specifications for ST3M729-10D40: Head Height: 0.340 INCHES MINIMUM AND 0.360 INCHES MAXIMUM IN; Fastener Length: 3.027 INCHES MINIMUM AND 3.074 INCHES MAXIMUM IN; Thread Length: 0.517 INCHES MINIMUM AND 0.584 INCHES MAXIMUM IN; Shank Unthreaded Hole Diameter: 0.141 INCHES MINIMUM AND 0.146 INCHES MAXIMUM FIRST HOLE 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.