Square nuts to GB/T 39-1988 and DIN 557 have a square outer profile that fits into square grooves to prevent rotation during tightening, simplifying assembly. The shape provides positive engagement in applications where the nut must remain fixed while the bolt is turned.

Materials offered include Grade 4.8 and 8.8 carbon steel, with A2 (304) or A4 (316) stainless steel optional. Surface finishes: black oxide, blue-white zinc, yellow zinc and hot-dip galvanized. Typical uses include solar brackets, guardrails, agricultural machinery, steel structures, tunnel supports and general construction machinery. Please confirm required size, thread and finish when ordering.