Specification notation:

1. According to the marking method of domestically produced wire thread inserts:
(1) ST (ordinary type) STd (diameter) p (pitch) -nd
(2) ZST (locking type) ZSTd (diameter) p (pitch) -nd
(3) ZGST (high temperature locking type) ZGSTd (diameter) p (pitch) -nd

2. According to the marking method of wire thread inserts produced abroad:
(1) FR (ordinary type) MD (diameter) ×P (pitch)-nD (diameter)
(2) SL (locking type) MD (diameter) ×P (pitch)-nD (diameter)

Standard notation:

D (diameter) × P (pitch) × N or W (number of wire screw turns in free state)

Note: various domestic standards for wire thread inserts have specific regulations on the marking method of wire thread inserts. Please refer to each standard for details.