... hexagon head,small countersunk head 3)Material:mild steel Rivet nuts 1.Material:stainless steel, carbon steel, aluminum 2.Size: ... Thread: UNC6-32~1/2-133..Finished: Zince, Nickel,etc.4.Flat head, flat hexagon head, small countersunk head5.. ... ASTM, ISO, JIS, BS and non-standard products2.Materialscarbon, low, mild, high strength, alloy and stainless steel3.Headdome and countersunk heads, large flange, ...