Grade B7M Bolts or Studs
Grade B7M Bolts or Studs
(OP)
This is just out of curiosity, in Section IIA, specification for SA-193/SA-193M para. 10.2.2 for grade B7M requires 100% testing the hardness of each stud or bolt. My question is this: If 100% testing is mandatory, why it is also a supplementary requirement?
(This requirement is repeated under the Supplementary Requirements - S3. 100% Hardness Testing of Grade B7M)
(This requirement is repeated under the Supplementary Requirements - S3. 100% Hardness Testing of Grade B7M)





RE: Grade B7M Bolts or Studs
What is mentioned under mandatory requirements in SA-193 is that each stud shall be tested to assure that the hardness range is within 200-235 BHN or 93-99 HRB. If the hardness is acceptable, the stud shall only be marked with a line under the grade symbol.
RE: Grade B7M Bolts or Studs
RE: Grade B7M Bolts or Studs