Heavy Nut 1)Standard:DIN,ANSI,ISO, 2)Materials:carbonsteel. Stainless steel . ... steel . 3)Grade:class 4.8 6.8 8. Heavy Nut Size 1/2"-3" Specification ASTM A193 B7/B16/B8M ... . UNC, 2A, grade 2, grade 5, ASTM A193 B73. Size: M16 to M100 or 1/2 "to 3"4. Length: 50mm ... customers require,according to customers' Drawings and/or samples Heavy Nut