The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-067-3399, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company. Government technical data includes 16 specifications, cited from the U.S. Government catalog. The record lists 8 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-067-3399 |
| Primary Part Number | ST3M729-6D27 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company |
| Status | ACTIVE |
| Head Height | 0.200 INCHES MINIMUM AND 0.220 INCHES MAXIMUM IN |
| Fastener Length | 2.063 INCHES MINIMUM AND 2.110 INCHES MAXIMUM IN |
| Thread Length | 0.365 INCHES MINIMUM AND 0.432 INCHES MAXIMUM IN |
| Shank Unthreaded Hole Diameter | 0.106 INCHES MINIMUM AND 0.111 INCHES MAXIMUM FIRST HOLE IN |
| Material Document and Classification | 23-112,FSCM 76301 MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.375 INCHES IN |
| Head Style | DOUBLE HEXAGON |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.678 INCHES MINIMUM AND 1.698 INCHES MAXIMUM IN |
| Width Between Flats | 0.553 INCHES MINIMUM AND 0.564 INCHES MAXIMUM IN |
| Grip Diameter | 0.3740 INCHES MINIMUM AND 0.3745 INCHES MAXIMUM IN |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| Material | STEEL CORROSION RESISTING OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 1.935 INCHES MINIMUM AND 2.002 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 |
|---|---|
| ST3M729-6D27 | Huck International, Inc (USA) |
| ST3M729-6D27 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| ST3M729-6D27 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| ST3M729-6D27 | The Boeing Company Div Defense (USA) |
| ST3M729-6D27 PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| ST3M729-6D27 | Heartland Precision Fasteners Inc (USA) |
| ST3M729-6D27 | Howmet Global Fastening Systems Inc (USA) |
| MB145-6D27 | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| ST3M729-6D27 | 5/9 Secondary reference U.S. Government activity |
| ST3M729-6D27 | 5/9 Secondary reference U.S. Government activity |
| ST3M729-6D27 | 5/9 Secondary reference U.S. Government activity |
| ST3M729-6D27 | 5/9 Secondary reference Valley-Todeco, Inc. Dba Arconic Fastening Systems |
| MB145-6D27 | 5/9 Secondary reference Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
NSN 5306-01-067-3399 is a Bolt,close Tolerance, manufactured by Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-067-3399 has 8 manufacturer part numbers on file: ST3M729-6D27 (Huck International, Inc), ST3M729-6D27 (Sps Technologies, Llc Dba PB Fasteners), ST3M729-6D27 (Fastener Innovation Technology, Inc. Dba F I T), ST3M729-6D27 (The Boeing Company Div Defense), ST3M729-6D27 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company) and 3 more.
Key specifications for ST3M729-6D27: Head Height: 0.200 INCHES MINIMUM AND 0.220 INCHES MAXIMUM IN; Fastener Length: 2.063 INCHES MINIMUM AND 2.110 INCHES MAXIMUM IN; Thread Length: 0.365 INCHES MINIMUM AND 0.432 INCHES MAXIMUM IN; Shank Unthreaded Hole Diameter: 0.106 INCHES MINIMUM AND 0.111 INCHES MAXIMUM FIRST HOLE IN. 16 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.