thread bolt, T-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 steel, Stainless steel3. Grade of T head Bolts: Metric size from Grade4.8 to Grade 12.9, Inch size from Grade2 to Grade10.4. Size of T head Bolts: diameter from M6to M20 or 1/4" to 3/4". Length can be from ...