How do you read a stud size?

The Steel Stud Manufacturer’s Associates (SSMA) has adopted a sizing standard that moves away from ‘gauges’ and directly specifies the material thickness in mils (100ths of an inch). A 600S162-54 is a 6-inch (600) Stud (S) with a 1-5/8” flange (162) with a thickness of 0.054 in (54). The designation of 600T125-54 is similar except that the ‘T’ represents a Track section.