Technical

According to ASME B18.2.1, bolt length shall be the distance measured parallel to the axis of the bolt from the bearing surface of the head to the extreme end of the bolt, including the point if the bolt is pointed. The length tolerances for bolts are listed in below tables. Length Tolerances for Nominal Sizes 1/4″ to 3/4″ *All values …

NPS is the abbreviation for nominal pipe size while DN is short for nominal diameter. The two designations have simple correlation between each other. *The correlation between NPS and DN. For NPS ≥ 4, the related DN = 25 multiplied by the NPS number.