Certification: ISO9001:2000  Stainless Steel Hexagonal Nut Hex nuts, hex domed cup nuts, prevailing torque type hex nuts, hex flange nuts Property classes: A2, A4, A2-70, A2-80, A4-80, A4-70, F594, B8, B8M Sizes: M4-M100, 1 / 4"-4"