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2021BS ISO 965-2:1998+A1:2021 ISO general purpose metric screw threads. Tolerances - Limits of sizes for general purpose external and internal screw threads. Medium quality
1999BS ISO 965-2:1999 ISO general purpose metric screw threads. Tolerances. Limits of sizes for general purpose external and internal screw threads. Medium quality
1999BS ISO 965-2:1998 ISO general purpose metric screw threads - Tolerances - Limits of sizes for general purpose external and internal screw threads - Medium quality