The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-256-4465, 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 16 specifications, cited from the U.S. Government catalog. The record lists 10 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5306-01-256-4465 |
| Primary Part Number | MB145-9D20 |
| 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 | 1.745 INCHES MINIMUM AND 1.792 INCHES MAXIMUM IN |
| Thread Length | 0.485 INCHES MINIMUM AND 0.552 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 | 1.240 INCHES MINIMUM AND 1.260 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 | 1.611 INCHES MINIMUM AND 1.678 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 |
|---|---|
| MB145-9D20 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M729-9D20 | Heartland Precision Fasteners Inc (USA) |
| ST3M729-9D20 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| ST3M729-9D20 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| ST3M729-9D20 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| ST3M729-9D20 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| ST3M729-9D20 | The Boeing Company Div Defense (USA) |
| MB145-9D20 PRIMARY | Hi-Shear Corporation (USA) |
| ST3M729-9D20 | Huck International, Inc (USA) |
| ST3M729-9D20 | Howmet Global Fastening Systems Inc (USA) |
| Reference | Meaning |
|---|---|
| ST3M729-9D20 | 5/9 Secondary reference U.S. Government activity |
| ST3M729-9D20 | 5/2 Secondary reference U.S. Government activity |
NSN 5306-01-256-4465 is a Bolt,close Tolerance, manufactured by Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-256-4465 has 10 manufacturer part numbers on file: MB145-9D20 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), ST3M729-9D20 (Heartland Precision Fasteners Inc), ST3M729-9D20 (Sps Technologies, Llc Dba PB Fasteners), ST3M729-9D20 (Valley-Todeco, Inc. Dba Arconic Fastening Systems), ST3M729-9D20 (Fastener Innovation Technology, Inc. Dba F I T) and 5 more.
Key specifications for MB145-9D20: Head Height: 0.318 INCHES MINIMUM AND 0.338 INCHES MAXIMUM IN; Fastener Length: 1.745 INCHES MINIMUM AND 1.792 INCHES MAXIMUM IN; Thread Length: 0.485 INCHES MINIMUM AND 0.552 INCHES MAXIMUM IN; Shank Unthreaded Hole Diameter: 0.141 INCHES MINIMUM AND 0.146 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.