Plain Coating Metal Threaded Rod Stud Bar DIN975 976 Metric Size L7 L7M L43

Grade B7M—The maximum hardness of the grade shall be 235 HBW or 99 HRB. The
minimum hardness shall not be less than 200 HBW or 93 HRB. Conformance to this
hardness shall be ensured by testing the hardness of each stud or bolt by Brinell
or Rockwell B methods in accordance with 9.2.1. The use of 100 % electromagnetic
testing for hardness as an alternative to 100 % indentation hardness testing is
permis-sible when qualified by sampling using indentation hardness testing. Each
lot tested for hardness electromagnetically shall be 100 % examined in accordance
with Practice E566. Follow-ing electromagnetic testing for hardness, a random
sample of a minimum of 100 pieces of each heat of steel in each lot (as defined in
12.1.1) shall be tested by indentation hardness methods. All samples must meet
hardness requirements to permit acceptance of the lot. If any one sample is
outside of the specified maximum or minimum hardness, the lot shall be rejected
and either reprocessed and resampled or tested 100 % by indentation hardness
methods.



Bolts, screws, studs, and stud bolts shall be pointed and shall have a workmanlike
finish. Points shall be flat and chamfered or rounded at option of the
manufacturer. Length of point on studs and stud bolts shall be not less than one
nor more than two complete threads as measured from the extreme end parallel to
the axis. Length of studs and stud bolts shall be measured from first thread to
first thread.