The Bolt,close Tolerance, cataloged under National Stock Number 5306-00-291-5245, 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 14 specifications, cited from the U.S. Government catalog. The record lists 16 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-00-291-5245 |
| Primary Part Number | ST3M453-5-8 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Head Height | 0.177 INCHES MINIMUM AND 0.197 INCHES MAXIMUM IN |
| Fastener Length | 0.951 INCHES MINIMUM AND 0.998 INCHES MAXIMUM IN |
| Thread Length | 0.441 INCHES MINIMUM AND 0.508 INCHES MAXIMUM IN |
| Nominal Thread Diameter | 0.312 INCHES IN |
| Head Style | DOUBLE HEXAGON |
| Thread Direction | RIGHT-HAND |
| Grip Length | 0.490 INCHES MINIMUM AND 0.510 INCHES MAXIMUM IN |
| Width Between Flats | 0.492 INCHES MINIMUM AND 0.502 INCHES MAXIMUM IN |
| Grip Diameter | 0.3115 INCHES MINIMUM AND 0.3120 INCHES MAXIMUM IN |
| Minimum Tensile Strength | 125000 POUNDS PER SQUARE INCH LBS |
| Thread Class | 3A A |
| Thread Quantity Per Inch | 24 |
| 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 |
|---|---|
| ST3M453-5-8 | Howmet Global Fastening Systems Inc (USA) |
| ST3M453-5-8 | Heartland Precision Fasteners Inc (USA) |
| ST3M453-5-8 | Saturn Fasteners Inc (USA) |
| ST3M453-5-8 | West Coast Aerospace, Inc. (USA) |
| 11825-5-8 | Reid Products Inc. Dba Reid Products Inc (USA) |
| GS1016-5-8 | B & B Specialties Inc Dba Gs Aerospace Div Gs Aerospace (USA) |
| ST3M453-5-8 | Sonic Industries, Inc. Dba Sonic Industries Inc Div Sonic Industries (USA) |
| ST3M453-5-8 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| ST3M453-5-8 | Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok (USA) |
| ST3M453-5-8 PRIMARY | The Boeing Company Div Defense (USA) |
| ST3M453-5-8 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| ST3M453-5-8 | Houston Precision Fasteners I Lp (USA) |
| ST3M453-5-8 | Huck International, Inc (USA) |
| ST3M453-5-8 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| ST3M453-5-8 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| ST3M453-5-8 | Hi-Shear Corporation (USA) |
| Reference | Meaning |
|---|---|
| ST3M453-5-8 | 5/9 Secondary reference M.s. Aerospace Inc. Dba Ms Aerospace Inc |
| BM17019-5-8 | C/1 Advisory reference — outside the item-of-supply concept Huck International, Inc |
| ST3M453-5-8 | 5/9 Secondary reference Abounding Security Inc Div of Maa Corp |
| ST3M453-5-8 | 5/9 Secondary reference Lisi Aerospace Canada Corp Div Hi Shear Holdings Inc |
| ST3M453-5-8 | 5/2 Secondary reference U.S. Government activity |
| BM17019-5-8 | 5/9 Secondary reference U.S. Government activity |
| ST3M453-5-8 | 5/9 Secondary reference Kenaloy Products Inc Sub Masco Corp |
NSN 5306-00-291-5245 is a Bolt,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5306, Bolts. Status: active.
NSN 5306-00-291-5245 has 16 manufacturer part numbers on file: ST3M453-5-8 (Howmet Global Fastening Systems Inc), ST3M453-5-8 (Heartland Precision Fasteners Inc), ST3M453-5-8 (Saturn Fasteners Inc), ST3M453-5-8 (West Coast Aerospace, Inc.), 11825-5-8 (Reid Products Inc. Dba Reid Products Inc) and 11 more.
Key specifications for ST3M453-5-8: Head Height: 0.177 INCHES MINIMUM AND 0.197 INCHES MAXIMUM IN; Fastener Length: 0.951 INCHES MINIMUM AND 0.998 INCHES MAXIMUM IN; Thread Length: 0.441 INCHES MINIMUM AND 0.508 INCHES MAXIMUM IN; Nominal Thread Diameter: 0.312 INCHES IN. 14 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.