- n° 100 Stud bolts 2”1/4 lg 1510 mm in ASTM F 1554 grade 36 or 55 zinc plated - n° 400 heavy nuts 2” 1/4 in ASTM A 194 2H zinc plated - n° 100 flat washers 2”1/4 R40 zinc plated Please enclose 3.1 certifications