The Bolt,close Tolerance, cataloged under National Stock Number 5306-00-357-1903, 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 17 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-00-357-1903 |
| Primary Part Number | ST3M453-8D45 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Head Height | 0.271 INCHES MINIMUM AND 0.291 INCHES MAXIMUM IN |
| Fastener Length | 3.445 INCHES MINIMUM AND 3.492 INCHES MAXIMUM IN |
| Thread Length | 0.623 INCHES MINIMUM AND 0.690 INCHES MAXIMUM IN |
| Shank Unthreaded Hole Diameter | 0.106 INCHES MINIMUM AND 0.111 INCHES MAXIMUM FIRST HOLE IN |
| Nominal Thread Diameter | 0.500 INCHES IN |
| Head Style | DOUBLE HEXAGON |
| Thread Direction | RIGHT-HAND |
| Specification/standard Data | 08524-B-17019 MANUFACTURERS STANDARD |
| Grip Length | 2.802 INCHES MINIMUM AND 2.822 INCHES MAXIMUM IN |
| Width Between Flats | 0.741 INCHES MINIMUM AND 0.752 INCHES MAXIMUM IN |
| Grip Diameter | 0.4990 INCHES MINIMUM AND 0.4995 INCHES MAXIMUM IN |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 20 |
| Material | STEEL CORROSION RESISTING OVERALL |
| Thread Series Designator | UNF |
| Distance From Head Largest Bearing Surface to Shank Hole Center | 3.317 INCHES MINIMUM AND 3.374 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 |
|---|---|
| S11-1060-8D45 | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| ST3M453-8D45 PRIMARY | The Boeing Company Div Defense (USA) |
| MB61-8D45 | Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc (CAN) |
| FIT7047-8D45 | Fastener Innovation Technology, Inc. Dba F I T (USA) |
| AIC753-8D45 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| 109453-8D45 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| GS1016-8D45 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| HP5453-8D45 | Heartland Precision Fasteners Inc (USA) |
| SLB252-8D45 | Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok (USA) |
| WC453-8D45 | West Coast Aerospace, Inc. (USA) |
| ST3M453-8D45 | Houston Precision Fasteners I Lp (USA) |
| 11825-8D45 | Reid Products Inc. Dba Reid Products Inc (USA) |
| PBF1253-8D45 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| VS3204-8D45 | Howmet Global Fastening Systems Inc (USA) |
| MB61-8D45 | Hi-Shear Corporation (USA) |
| BM17019-8D45 | Huck International, Inc (USA) |
| VAL23029-8D45 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| Reference | Meaning |
|---|---|
| 109453-8D45 | 5/9 Secondary reference Sps Technologies Inc |
| US3204-8D45 | 5/2 Secondary reference U.S. Government activity |
| BM17019-8D45 | 5/9 Secondary reference U.S. Government activity |
NSN 5306-00-357-1903 is a Bolt,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-357-1903 has 17 manufacturer part numbers on file: S11-1060-8D45 (Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries), ST3M453-8D45 (The Boeing Company Div Defense), MB61-8D45 (Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc), FIT7047-8D45 (Fastener Innovation Technology, Inc. Dba F I T), AIC753-8D45 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company) and 12 more.
1 possible match (shared part number, not a government interchangeability claim): 5310-00-811-6892. Verify interchangeability with system specifications before substitution.
Key specifications for ST3M453-8D45: Head Height: 0.271 INCHES MINIMUM AND 0.291 INCHES MAXIMUM IN; Fastener Length: 3.445 INCHES MINIMUM AND 3.492 INCHES MAXIMUM IN; Thread Length: 0.623 INCHES MINIMUM AND 0.690 INCHES MAXIMUM IN; Shank Unthreaded Hole Diameter: 0.106 INCHES MINIMUM AND 0.111 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.