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, creating a secure fit. The standard Channel Nut conforms to ASTM A576GR 1015 modified and A1011 SS GR 45. Unistrut P1006 Series Channel Nuts with Springs can be used with P1000, P1100, P2000 and P3000 Unistrut Channels.