... -bolt, T head bolts, hammer head bolts thread bolt, T-bolt, T head bolts, hammer head bolts 1. Standard of T head Bolts: DIN,ANSI,BS,AS,etc.2. Material of T head Bolts: Carbon ... M20 or 1/4" to 3/4". Length can be from 10mm to 500mm.5. Surafce Finish of T head Bolts: plain, black, zinc plated, H ...