Threads meet the Unified Screw Thread standard, ANSI B1.1, coarse series (UNC) class 2. Channel Nuts are also available in many standard metric sizes. Unistrut Channel Nuts are manufactured from mild steel cold rolled coil, and after stamping and machining operations are completed, they are case hardened, assuring positive biting action into the inturned edge of the Unistrut Channel.