M12-1.75 x 50 Button Socket Cap Screw 12.9 Alloy ISO 7380 Black Oxide - Metric

M12-1.75 x 50 Button Socket Cap Screw 12.9 Alloy ISO 7380 Black Oxide - Metric . Alloy Button Socket Head Cap Screws from Brighton Best. Hardness of RC 38-43, meets or exceeds ISO 7380. Manufactured from heat treated alloy steel, 1960 series.