1/2”-13 Threads, Base Size (In., ) 1x 1 , Height:0., 6. 1/2-13 Thread Size, Steel, Square Nut - 177V02|B11120.050.0001 Black Oxide T-nuts DIN934 Black Oxide Square Nuts 1/2-13 Square Plain Finish Steel Nuts 1/2-13 Thread Nuts T-Slot Nut 8 St M5, bright zinc-plated » Group 1018 mild/low carbon steel, Case hardened, Oxide Finish. Heat treated steel T-Slot Nuts with black oxide finish feature an imperfect thread in the base of the T-nut to eliminate any danger of screwing the clamping stud through and damaging the table slot Heat treated steel T-Slot Nuts with black oxide finish feature an imperfect thread in the base of the T-nut to eliminate any danger of screwing the clamping stud through and damaging the table slot., Sold in packs of 4., T-nut to eliminate any danger of screwing the clamping stud through and damaging the table slot.