The Bolt,close Tolerance, cataloged under National Stock Number 5306-01-624-9374, 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 17 specifications, cited from the U.S. Government catalog. The record lists 9 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 5306-01-624-9374 |
| Primary Part Number | ST3M453-4D50 |
| Item Name | Bolt,close Tolerance |
| FSC / FSG | 5306 / 53 — Bolts |
| Manufacturer | The Boeing Company Div Defense |
| Status | ACTIVE |
| Head Height | 0.164 INCHES NOMINAL IN |
| Fastener Length | 3.522 INCHES NOMINAL IN |
| Thread Length | 0.397 INCHES NOMINAL IN |
| Shank Unthreaded Hole Diameter | 0.076 INCHES MINIMUM AND 0.081 INCHES MAXIMUM FIRST HOLE IN |
| Nominal Thread Diameter | 0.2500 INCHES IN |
| Head Style | DOUBLE HEXAGON |
| Thread Direction | RIGHT-HAND |
| Grip Length | 3.125 INCHES NOMINAL IN |
| Width Between Flats | 0.439 INCHES MAXIMUM IN |
| Grip Diameter | 0.2490 INCHES MINIMUM AND 0.2495 INCHES MAXIMUM IN |
| Surface Treatment | PASSIVATE OVERALL |
| Minimum Tensile Strength | 125000 POUNDS PER SQUARE INCH LBS |
| 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 | 3.401 INCHES MINIMUM AND 3.411 INCHES MAXIMUM FIRST HOLE IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| WC453-4D50 | West Coast Aerospace, Inc. (USA) |
| AIC753-4D50 | Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company (USA) |
| PBF1253-4D50 | Sps Technologies Llc Dba PB Fasteners Div PB Fasteners (USA) |
| 109453-4D50 | Sps Technologies, Llc Dba PB Fasteners (USA) |
| VS3204-4D50 | Howmet Global Fastening Systems Inc (USA) |
| VAL23029-4D50 | Valley-Todeco, Inc. Dba Arconic Fastening Systems (USA) |
| MB61-4D50 | Hi-Shear Corporation (USA) |
| SLB252-4D50 | Space-Lok, Inc. Dba Space-Lok Inc Div Space-Lok (USA) |
| ST3M453-4D50 PRIMARY | The Boeing Company Div Defense (USA) |
| Reference | Meaning |
|---|---|
| 109453-4D50 | 5/2 Secondary reference U.S. Government activity |
NSN 5306-01-624-9374 is a Bolt,close Tolerance, manufactured by The Boeing Company Div Defense, classified under FSC 5306, Bolts. Status: active.
NSN 5306-01-624-9374 has 9 manufacturer part numbers on file: WC453-4D50 (West Coast Aerospace, Inc.), AIC753-4D50 (Sps Technologies, Llc Dba Air Industries Company Div Air Industries Company), PBF1253-4D50 (Sps Technologies Llc Dba PB Fasteners Div PB Fasteners), 109453-4D50 (Sps Technologies, Llc Dba PB Fasteners), VS3204-4D50 (Howmet Global Fastening Systems Inc) and 4 more.
Key specifications for ST3M453-4D50: Head Height: 0.164 INCHES NOMINAL IN; Fastener Length: 3.522 INCHES NOMINAL IN; Thread Length: 0.397 INCHES NOMINAL IN; Shank Unthreaded Hole Diameter: 0.076 INCHES MINIMUM AND 0.081 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.
NSN 5306-01-624-9374 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
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.