287136 - Miller 287136 Heavy Duty Flat Washer .406 ID x 1.50 OD x .250 Thick

Miller 287136 Heavy-Duty Flat Washer: Specifications and Applications

The Miller 287136 is a specialized, heavy-duty flat washer designed for specific assembly requirements within Miller welding power sources and generators. When repairing or refurbishing your welding equipment, precision matters. This washer is manufactured to exact tolerances to ensure it performs exactly as the original engineering team intended. It is not a generic hardware store item; it is a purpose-built component for high-stress applications.

Technical Specifications

This washer is characterized by its heavy-gauge profile. The key dimensions are:

• Inner Diameter (ID): 0.406 inches (approx. 13/32"), designed to fit 3/8-inch bolts comfortably with appropriate clearance.
• Outer Diameter (OD): 1.500 inches (1-1/2"), providing a large bearing surface.
• Thickness (T): 0.250 inches (1/4"), offering extreme rigidity and resistance to cupping or bending.

Material and Finish

Constructed from high-grade steel, the Miller 287136 is built to withstand significant clamping loads. The "PLD" designation indicates a plated finish, typically zinc, which provides a sacrificial layer to prevent oxidation and corrosion. This is particularly important for welding machines that may be exposed to flux, fumes, moisture, or varying temperatures. The plating ensures the washer does not seize to the bolt or the base material, facilitating easier future maintenance.

Application and Fitment

Thick washers like the 287136 are often utilized in mounting applications where standard washers would fail. They act as spacers or heavy-duty load spreaders, often found on engine mounts, generator stators, or main chassis connection points. The 1/4-inch thickness allows it to bridge larger holes or slots without collapsing, making it an essential spare part for technicians servicing Miller Bobcats, Trailblazers, or Big Blue series machines (check your specific parts manual for verification). Ensure your repairs meet factory standards by using the correct, heavy-duty hardware.