Slotted Hex Castle Nut Size M12-1.5 DIN937 Standard   Product Description Hex castle nut is a hex nut with opposed slots cut into the top of the nut through the centers of the flats. The slots are on the end opposite the bearing surface. The slots are for the insertion of a cotter pin to secure the nut when used with a drilled shank fastener. Please visit us at hexnuts.cn for more information! Material Options: Carbon Steel C1010, C1035, C1045 Grade: DIN935/DIN937 Class 8, Class 10 ANSI/ASTM/SAE Grade 5, 8, 10 Surface Treatment: Zinc Plated (white zinc or blue zinc) Yellow Zinc Plated Black Zinc Plated Nickel Plated Hot dipper galvanized Brass Coated  Dacromet   Packaging & Shipping             Company Information Material-Steel Wires   Wire Resizing-Pre-treatment   Cold Forging   Thread Cutting  Tempering & Quenching (if needed)-Surface Treatment (Galvanizing) Outside Contracted