The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-076-3168, 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 17 specifications, cited from the U.S. Government catalog. The record lists 15 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5306-01-076-3168 |
| Primary Part Number | MB145-10D55 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| Status | ACTIVE |
| Head Height | 0.340 INCHES MINIMUM AND 0.360 INCHES MAXIMUM IN |
| Fastener Length | 3.965 INCHES MINIMUM AND 4.012 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,FSCM 76301 MFR REF SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.625 INCHES IN |
| Head Style | DOUBLE HEXAGON |
| Thread Direction | RIGHT-HAND |
| Specification/standard Data | 76301-ST3-729 MANUFACTURERS STANDARD |
| Grip Length | 3.428 INCHES MINIMUM AND 3.448 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 |
| 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 | 3.831 INCHES MINIMUM AND 3.898 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 |
|---|---|
| ST3M729-10D55 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| ST3M729-10D55 | Heartland Precision Fasteners Inc (USA) |
| ST3M729-10D55 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| ST3M729-10D55 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| ST3M729-10D55 | Reid Products Inc. Dba Reid Products Inc (USA) |
| MB145-10D55 PRIMARY | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M729-10D55 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| ST3M729-10D55 | West Coast Aerospace, Inc. (USA) |
| ST3M729-10D55 | Houston Precision Fasteners I Lp (USA) |
| ST3M729-10D55 | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| ST3M729-10D55 | Howmet Global Fastening Systems Inc (USA) |
| ST3M729-10D55 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| ST3M729-10D55 | Huck International, Inc (USA) |
| MB145-10D55 PRIMARY | Hi-Shear Corporation (USA) |
| ST3M729-10D55 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| Reference | Meaning |
|---|---|
| ST3M729-10D55 | 7/2 Vendor item drawing reference The Boeing Company Div Defense |
| ST3M729-10D55 | 5/2 Secondary reference U.S. Government activity |
| ST3M729-10D55 | 5/2 Secondary reference U.S. Government activity |
| ST3M729-10D55 | 5/9 Secondary reference U.S. Government activity |
NSN 5306-01-076-3168 is a Bolt,close Tolerance, manufactured by Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-076-3168 has 15 manufacturer part numbers on file: ST3M729-10D55 (Sps Technologies, Llc Dba PB Fasteners), ST3M729-10D55 (Heartland Precision Fasteners Inc), ST3M729-10D55 (Fastener Innovation Technology, Inc. Dba F I T), ST3M729-10D55 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), ST3M729-10D55 (Reid Products Inc. Dba Reid Products Inc) and 10 more.
Key specifications for MB145-10D55: Head Height: 0.340 INCHES MINIMUM AND 0.360 INCHES MAXIMUM IN; Fastener Length: 3.965 INCHES MINIMUM AND 4.012 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.