BBI Carriage Bolt, Fully Threaded, Measurement System: Imperial, #10-24 Thread, 1 in Length Under Head, Low Carbon Steel, A Grade, Zinc CR+3, 0.436 in Diameter Head, 1/8 in Neck, Square Neck, 60000 psi Tensile Strength, 0.199 in Drive, UNC Thread, Square Drive, B70 to B100 Hardness, Material Specification: ASTM A307, Round Head