The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-379-9652, 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 13 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 5306-01-379-9652 |
| Primary Part Number | ST3M453-9-21 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Extended Washer Thickness | 0.016 INCHES NOMINAL IN |
| Head Height | 0.318 INCHES MINIMUM AND 0.338 INCHES MAXIMUM IN |
| Fastener Length | 2.022 INCHES MINIMUM AND 2.069 INCHES MAXIMUM IN |
| Extended Washer Diameter | 0.851 INCHES MINIMUM AND 0.891 INCHES MAXIMUM IN |
| Thread Length | 0.725 INCHES NOMINAL IN |
| Nominal Thread Diameter | 0.563 INCHES IN |
| Head Style | DOUBLE HEXAGON EXTENDED WASHER |
| Thread Direction | RIGHT-HAND |
| Grip Length | 1.313 INCHES NOMINAL IN |
| Width Between Flats | 0.877 INCHES NOMINAL 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) |
| 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 |
|---|---|
| ST3M453-9-21 | Heartland Precision Fasteners Inc (USA) |
| ST3M453-9-21 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| ST3M453-9-21 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| BM17019-9-21 | Deutsch Co the (USA) |
| 11825-9-21 | Reid Products Inc. Dba Reid Products Inc (USA) |
| ST3M453-9-21 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| ST3M453-9-21 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| ST3M453-9-21 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| ST3M453-9-21 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| ST3M453-9-21 PRIMARY | The Boeing Company Div Defense (USA) |
| GS1016-9-21 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| ST3M453-9-21 | Hi-Shear Corporation (USA) |
| ST3M453-9-21 | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| Reference | Meaning |
|---|---|
| ST3M453-9-21 | 5/9 Secondary reference Kenaloy Products Inc Sub Masco Corp |
| ST3M453-9-21 | 5/2 Secondary reference U.S. Government activity |
NSN 5306-01-379-9652 is a Bolt,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-379-9652 has 13 manufacturer part numbers on file: ST3M453-9-21 (Heartland Precision Fasteners Inc), ST3M453-9-21 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), ST3M453-9-21 (Fastener Innovation Technology, Inc. Dba F I T), BM17019-9-21 (Deutsch Co the), 11825-9-21 (Reid Products Inc. Dba Reid Products Inc) and 8 more.
Key specifications for ST3M453-9-21: Extended Washer Thickness: 0.016 INCHES NOMINAL IN; Head Height: 0.318 INCHES MINIMUM AND 0.338 INCHES MAXIMUM IN; Fastener Length: 2.022 INCHES MINIMUM AND 2.069 INCHES MAXIMUM IN; Extended Washer Diameter: 0.851 INCHES MINIMUM AND 0.891 INCHES MAXIMUM 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.