Wogulitsa katundu komanso wogulitsa ASTM A249 Tubing

ASTM A249/A249M – 16a

Nambala yodziwika ya ASTM imazindikiritsa mtundu wapadera wa ASTM.

A249/A249M – 16a

A = zitsulo zachitsulo;

249 = kupatsidwa nambala yotsatizana

M = SI mayunitsi

16 = chaka cha kukhazikitsidwa koyambirira (kapena, ngati kukonzanso, chaka chosinthidwa komaliza)

a = ikuwonetsa kukonzanso kotsatira mchaka chomwecho