ASTM A320 L7M STUD BOLT C/W 2 A194 7M HEAVY HEX NUTS
ASTM A320 L7M is manufactured from AISI 4140 round bar and is supplied in a quenched and tempered condition.The maximum hardness of Grade L7M shall be 235 HBW or 99 HRB (conversion in accordance with Table Number 2B of Test Methods and Definitions A370). Minimum hardness shall not be less than 200 HBW or 93 HRB. Conformance to this hardness shall be ensured by testing each bolt or stud by Brinell or Rockwell B methods in accordance with 6.3.1
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