Buy Small Parts 1018 Steel T-Slot Nut, Black Oxide Finish, Tapped Through, 1/2"-13 in USA, United States, for US $104. Small Parts 1018 Steel T-Slot Nut, Black Oxide Finish, Tapped Through, 1/2"-13 Threads, 5/8" Height, 9/16" Slot Depth, Made in US (Pack of 5 T-slot Nut Small Parts 1018 Steel , Black Oxide Finish, Grade 5/8 Slot Depth T-nut The 1/2-13 threads are perfect for most standard bolts, and they're designed to fit 9/16-inch table slots with a 5/8-inch height and 7/8-inch width. The through... Material is case hardened 1018 steel with black oxide finish., 1/2-13 Thread., 5/8 Table slot., 1-1/8 Base size. Te-Co 41428 Black Oxide 1018 Steel T-Slot Nut, 1-8 TPI (Incomplete Material is case hardened 1018 steel with black oxide finish , 1/2-13 Thread , 5/8 Table slot , 1-1/8 Base size