Atkore Unistrut P3006 channel nut for 1-5/8" strut channel, 1/4"-20 thread, without spring, electrogalvanized. The case-hardened nut has serrations that bite into the inturned edges of the strut channel to lock fasteners in place; the body shape helps orient the nut in the channel during torquing. Works with P1000, P1100, P3000, P3300, P4100, P5000, and P5500 channels. Dimensions 3/4" x 1/4" x 1-23/64". Available in EG, Defender, hot-dip galvanized, and stainless finishes.