Mai hannun jari kuma mai samar da bututun ASTM A249

ASTM A249 / A249M – 16a

Lambar tantancewa ta ASTM tana gano sigar musamman ta ma'aunin ASTM.

A249 / A249M – 16a

A = ƙarfe mai ƙarfe;

249 = lambar da aka sanya a jere

M = raka'o'in SI

16 = shekarar da aka fara ɗaukar nauyin (ko kuma, idan aka yi gyara, shekarar da aka yi gyara a baya)

a = yana nuna bita na gaba a cikin wannan shekarar