ASTM A453 covers specifications for high temperature bolted joints with coefficients of expansion comparable to austenitic stainless steels. We manufacture A453 Grade 660 Grade D stud bolts, hex bolts, expansion bolts, threaded rods and more for special engineering applications. Meanwhile, ASTM A453 Grade 660 Grade D specification provides the yield strength, i.e. 95 ksi 655 MPa for high temperature service, respectively, for bolted components such as studs, screws, nuts, hex bolts, and pressure vessel and valve flanges Various other fasteners.