an externally threaded fastener, with a trimmed, square shaped external wrenching head. used in applications where the use of power tools is impractical or undesirable. Offers greater bearing area for more positive gripping with a hand wrench.Â
grade: ss 304
grade ss 316
high tensile gr. 8.8 / gr. 10.9
mild steel gr. 4.6 / gr.