Thread Tags Tagging Format:
Code thread code thread--tolerance band (diameter, diameter)-screwing length
L) tolerance zone code consists of numbers and letters (internal thread with a capital letter, external thread using lowercase letters), such as 7H, 6g, and so on, in particular, 7H,6g as well as tolerances, and H7,g6 represents the cylinder code of tolerance.
2) screwing length provided for short (s), (n) and long (l) three. Under normal circumstances, no mark thread length, the thread tolerance zone according to the secondary screwing length (n). If necessary, raise screwing length code number s or l, such as "M20-5g6g-L". Special needs can indicate screwing length values, such as "M20-5g6g-30".