Hirobo HI2506046 3 x 20 x 1T Plastic Flat Washer for Helicopter Parts  [HI2506046]

Low-profile plastic spacer for helicopter parts

The Hirobo HI2506046 flat washer is a plastic RC washer sized 3 x 20 x 1T with KDC-B marking, designed for general helicopter component use. It performs as a low-profile spacer and distributes load across mating surfaces in compact assemblies.

Used between tightened components, the washer prevents direct plastic-on-plastic contact, aids in centering shafts or screws, and helps keep alignment during routine checks. While the plastic body reduces metal-on-metal wear, it can compress if clamped excessively, so it is recommended for light fastening applications.

Fitting notes: place the washer over the shaft or screw until it sits flush, and do not overtighten to avoid deformation. Use multiple washers when precise stack-up thickness is required and verify clearance with any rotating parts before finishing the build. Periodic inspection will reveal any wear or flattening that signals replacement is needed.