The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-030-1764, is classified within Federal Supply Class 5306 (Bolts) of the Hardware and Abrasives group. The manufacturer of record is The Boeing Company Div Defense. Government technical data includes 16 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through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-030-1764 |
| Primary Part Number | ST3M729-4D38 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Head Height | 0.154 INCHES MINIMUM AND 0.174 INCHES MAXIMUM IN |
| Fastener Length | 2.675 INCHES MINIMUM AND 2.722 INCHES MAXIMUM IN |
| Thread Length | 0.290 INCHES MINIMUM AND 0.357 INCHES MAXIMUM IN |
| Shank Unthreaded Hole Diameter | 0.076 INCHES MINIMUM AND 0.081 INCHES MAXIMUM FIRST HOLE IN |
| Material Document and Classification | AMS 5629 ASSN STD SINGLE MATERIAL RESPONSE OVERALL |
| Nominal Thread Diameter | 0.250 INCHES IN |
| Head Style | DOUBLE HEXAGON |
| Thread Direction | RIGHT-HAND |
| Grip Length | 2.365 INCHES MINIMUM AND 2.385 INCHES MAXIMUM IN |
| Width Between Flats | 0.430 INCHES MINIMUM AND 0.439 INCHES MAXIMUM IN |
| Grip Diameter | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 28 |
| Material | STEEL COMP XM-13 OVERALL |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 2.547 INCHES MINIMUM AND 2.614 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 |
|---|---|
| ST3M729-4D38 PRIMARY | The Boeing Company Div Defense (USA) |
| ST3M729-4D38 | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| ST3M729-4D38 | Houston Precision Fasteners I Lp (USA) |
| ST3M729-4D38 PRIMARY | Sps Technologies, Llc Dba PB Fasteners (USA) |
| ST3M729-4D38 PRIMARY | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| ST3M729-4D38 | Reid Products Inc. Dba Reid Products Inc (USA) |
| ST3M729-4D38 | Heartland Precision Fasteners Inc (USA) |
| ST3M729-4D38 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| ST3M729-4D38 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| ST3M729-4D38 | Howmet Global Fastening Systems Inc (USA) |
| ST3M729-4D38 PRIMARY | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| ST3M729-4D38 PRIMARY | Huck International, Inc (USA) |
| MB145-4D38 PRIMARY | Hi-Shear Corporation (USA) |
| ST3M729-4D38 | West Coast Aerospace, Inc. (USA) |
| Reference | Meaning |
|---|---|
| ST3M729-4D38 | 3/2 Design control — primary reference U.S. Government activity |
| ST3M729-4D38 | 5/9 Secondary reference U.S. Government activity |
| MB145-4D38 | 3/9 Design control — primary reference Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| ST3M729-4D38 | 5/2 Secondary reference U.S. Government activity |
| ST3M729-4D38 | 5/9 Secondary reference Hi-Shear Corporation |
NSN 5306-01-030-1764 is a Bolt,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-030-1764 has 14 manufacturer part numbers on file: ST3M729-4D38 (The Boeing Company Div Defense), ST3M729-4D38 (Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries), ST3M729-4D38 (Houston Precision Fasteners I Lp), ST3M729-4D38 (Sps Technologies, Llc Dba PB Fasteners), ST3M729-4D38 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company) and 9 more.
Key specifications for ST3M729-4D38: Head Height: 0.154 INCHES MINIMUM AND 0.174 INCHES MAXIMUM IN; Fastener Length: 2.675 INCHES MINIMUM AND 2.722 INCHES MAXIMUM IN; Thread Length: 0.290 INCHES MINIMUM AND 0.357 INCHES MAXIMUM IN; Shank Unthreaded Hole Diameter: 0.076 INCHES MINIMUM AND 0.081 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.