Square flat washer (GB/T 96) is a square plate with a central hole. Compared with round washers, it provides a larger bearing surface and helps distribute pressure to reduce local surface deformation. Materials offered: carbon steel, A2 (304) and A4 (316) stainless steel. Surface finishes include black oxide, blue-white zinc, yellow zinc and hot-dip galvanizing.

These washers are intended for use with square mounting holes and are commonly applied on steel brackets, solar supports, guardrails, curtain walls and embedded connections. Please confirm required size, thickness and compatible finish for your application before ordering.