The A53 equivalent, an 8 inch standard pipe, has an OD tolerance of +/-1% and a wall tolerance of -12.5%. Hence, an A500 round has better/tighter OD and wall tolerances. Another word to the wise:A53 pipe is available only in lengths of 21 and 42. A500 rounds can be produced in lengths from 20 to 75. ASTM A53 Carbon Steel Seamless Pipe SpecificationsSep 14, 2020 · ASTM A53 (ASME SA53) carbon steel pipe is a specification that covers seamless and welded black and hot-dipped galvanized steel pipe in NPS 1/8 to NPS 26. A53 is intended for pressure and mechanical applications and is also acceptable for ordinary uses in steam, water, gas, and air lines.
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