ASTM A453 Grade 660 Class A specification provides a yield strength viz. 85 ksi [585 MPa] respectively for use in high temperature service for bolting components such as Stud bolts, screws, nuts, hex bolts & various other fasteners for pressure vessel and valve flanges. A453 Grade 660 Class A is equivalent to class D when manufactured in single age hardened condition.. A453 Grade 660 Cl A Studs and nuts are capable of meeting impact test requirements of 40 joules minimum at - 196 Degrees Centigrade. ASTM A453 Grade 660 Class A is produced in various other forms like wire rods, round bars, shafts, castings, forgings, threaded bars, threaded rods, wires, tubings, sheets, plates, welding rods, hex bars, Rivets & Springs. Class A Bolting can be certified under nace provided the hardness is controlled and not over 35HRC.
ASTM A453 660 Class A Fasteners are availvbe in different size
Size Ranging from :
Diameter : M6-M100 ; 1/4"-4"
Length : 20mm-1000mm ; 3/4"-40"