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The Miller 223040 is a precision-engineered hex head screw utilized across a variety of Miller Electric welding machines and auxiliary equipment. This fastener is defined by its specific dimensions: a 0.250-inch diameter with 28 threads per inch (TPI), and a length of 0.87 inches. The 1/4-28 UNF thread profile is a critical specification; fine threads are stronger in tension than coarse threads of the same diameter because they have a larger stress area. Furthermore, their smaller helix angle allows for finer adjustment and provides greater resistance to loosening from vibration, a common occurrence in heavy-duty welding environments involving fans, transformers, and engines.
Material composition is paramount in equipment repair. This screw is manufactured from Grade 5 steel, identified by the three radial lines on the head (though markings may vary by size, the spec confirms Grade 5). Grade 5 fasteners are the workhorses of the automotive and industrial machinery worlds, offering a minimum tensile strength of 120,000 psi. This strength allows technicians to apply the necessary torque to ensure a secure seal or bond between components without the risk of stripping or snapping the head, provided proper torque specs are followed. The hex head design enables the use of standard sockets and wrenches, facilitating easy installation in tight spaces where other drive types might slip.
The "Plated Zinc Clr" specification refers to a clear chromate conversion coating over zinc plating. This finish provides excellent corrosion resistance by forming a barrier against moisture and oxidation. In a welding shop environment, where equipment is exposed to sparks, grinding dust, and atmospheric changes, unplated steel would rust quickly, potentially seizing in the hole and making future removal difficult or impossible. The zinc plating ensures the threads remain clean and functional over the lifespan of the part.
This item is distributed as a package of 10 units. For MRO (Maintenance, Repair, and Operations) managers and welding technicians, stocking OEM hardware like the Miller 223040 is a proactive measure. It eliminates the downtime associated with sourcing specific fine-thread bolts from general hardware suppliers who often only stock coarse thread (1/4-20) options. Ensure your Miller equipment—whether it's a TIG runner, a diesel engine drive, or a wire feeder—is reassembled with the exact hardware intended by the engineering team.
Technical Summary:
| Additional Information |
|---|
| Brand:Miller |
| Packaging Description:10-per-ea |
| Thread Size:1/4-28 UNF |
| Length:0.87 in |
| Head Type:Hex Head |
| Material Grade:Grade 5 Steel |
| Finish:Zinc Plated Clear |
$350 Rebate
$350 Rebate
