111443 - Miller Strain Relief Bushing .875 Mount (Pack of 2)

Technical Overview of the Miller 111443 Strain Relief Bushing

The Miller 111443 is a specialized strain relief bushing designed to secure power cables entering the chassis of welding equipment. In industrial electrical design, the integrity of the connection between the external power source and the internal machine components is critical. This bushing serves a dual purpose: it mechanically anchors the cord to the machine housing to prevent tension from being transferred to the delicate internal terminal connections, and it provides a protective barrier against the sharp edges of the metal chassis knockout, thereby preventing insulation abrasion and potential short circuits.

This specific component is engineered to fit a mounting hole diameter of 0.875 inches, which corresponds to a standard 7/8-inch knockout often found on Miller power sources and auxiliary equipment. The inner dimensions of the bushing are specified at .240 inches by .510 inches. This rectangular or oval profile suggests it is optimized for flat cabling or specific cord types often used in lower amperage or auxiliary power applications. Proper sizing is essential; a loose bushing will not provide adequate strain relief, while an overly tight one may damage the cable jacket during installation.

Manufactured from high-durability industrial thermoplastics, the Miller 111443 is resistant to the thermal cycling and mechanical vibration common in welding environments. The material is non-conductive, adding an extra layer of electrical safety at the cable entry point. Failure to maintain these bushings can lead to catastrophic failure of the power cord assembly, posing significant safety risks to operators and potential damage to the welding machine's internal circuitry. This product is supplied as a package of two, allowing for immediate replacement and the maintenance of a spare for future preventative maintenance schedules.

When integrating this part, technicians should verify the cable profile matches the .240/.510 ID specification to ensure the bushing clamps effectively around the jacket without crushing the conductors. It is a direct OEM replacement part, ensuring strict adherence to Miller Electric's original manufacturing tolerances and safety standards.