The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-256-4464, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc. Government technical data includes 15 specifications, cited from the U.S. Government catalog. The record lists 11 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-256-4464 |
| Primary Part Number | MB145-9D18 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| Status | ACTIVE |
| Head Height | 0.318 INCHES MINIMUM AND 0.338 INCHES MAXIMUM IN |
| Fastener Length | 1.620 INCHES MINIMUM AND 1.667 INCHES MAXIMUM IN |
| Shank Unthreaded Hole Diameter | 0.141 INCHES MINIMUM AND 0.146 INCHES MAXIMUM FIRST HOLE IN |
| Nominal Thread Diameter | 0.562 INCHES IN |
| Head Style | DOUBLE HEXAGON |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.115 INCHES MINIMUM AND 1.135 INCHES MAXIMUM IN |
| Width Between Flats | 0.741 INCHES MINIMUM AND 0.865 INCHES MAXIMUM IN |
| Grip Diameter | 0.5610 INCHES MINIMUM AND 0.5615 INCHES MAXIMUM IN |
| Minimum Tensile Strength | 125000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 18 |
| Material | STEEL CORROSION RESISTING OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 1.486 INCHES MINIMUM AND 1.553 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 |
|---|---|
| ST3M729-9D18 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| ST3M729-9D18 | Huck International, Inc (USA) |
| ST3M729-9D18 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| MB145-9D18 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M729-9D18 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| MB145-9D18 PRIMARY | Hi-Shear Corporation (USA) |
| ST3M729-9D18 | Heartland Precision Fasteners Inc (USA) |
| ST3M729-9D18 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| ST3M729-9D18 | Devine Mfg Co (USA) |
| ST3M729-9D18 | Howmet Global Fastening Systems Inc (USA) |
| ST3M729-9D18 | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| ST3M729-9D18 | 5/2 Secondary reference U.S. Government activity |
| ST3M729-9D18 | 5/9 Secondary reference U.S. Government activity |
NSN 5306-01-256-4464 is a Bolt,close Tolerance, manufactured by Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-256-4464 has 11 manufacturer part numbers on file: ST3M729-9D18 (Sps Technologies, Llc Dba PB Fasteners), ST3M729-9D18 (Huck International, Inc), ST3M729-9D18 (Valley-Todeco, Inc. Dba Arconic Fastening Systems), MB145-9D18 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), ST3M729-9D18 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company) and 6 more.
Key specifications for MB145-9D18: Head Height: 0.318 INCHES MINIMUM AND 0.338 INCHES MAXIMUM IN; Fastener Length: 1.620 INCHES MINIMUM AND 1.667 INCHES MAXIMUM IN; Shank Unthreaded Hole Diameter: 0.141 INCHES MINIMUM AND 0.146 INCHES MAXIMUM FIRST HOLE IN; Nominal Thread Diameter: 0.562 INCHES 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.