Square flat washer is square plate with center hole. Compared with round washers, it provides larger contact area and better pressure distribution to avoid surface deformation of workpieces.
Materials: Carbon steel, A2(304)/A4(316) stainless steel.
Surface finish: black oxide, blue-white zinc, yellow zinc, hot-dip galvanized.
Widely used for steel brackets, solar supports, guardrails, curtain walls and embedded connections, suitable for square mounting holes.