Umthengisi kanye nomhlinzeki we-ASTM A249 Tubing

I-ASTM A249 / A249M – 16a

Inombolo yokuqokwa kwe-ASTM ikhomba inguqulo eyingqayizivele yendinganiso ye-ASTM.

A249 / A249M – 16a

A = izinsimbi zensimbi;

249 = inombolo elandelanayo enikeziwe

M = amayunithi e-SI

16 = unyaka wokwamukelwa kokuqala (noma, esimweni sokubuyekezwa, unyaka wokubuyekezwa kokugcina)

a = kubonisa ukubuyekezwa okulandelayo ngonyaka ofanayo