This approved grade B7 threaded stud has a temperature range of -50 to 900ƒx? for liquid and -40 to 900ƒx? for air with a PSI of 1,25,000. Made of 4140 alloy steel. This stud is size 8 1/4 x 1 1/4 inches, has a thread size of 1 1/4". Each is sold separat