ISO 7380 muaj cov ntu hauv qab no, hauv cov kab hluav taws xob Cov Npe khawm taub hau screws:
Qhov 1: Hexagon ntsawb khawm taub hau ntswj ntswj
Qhov 2: Hexagon ntsawb khawm taub hau screws nrog dab tshos
Qhov no ISO 7380-2 Txheem Thoob Ntiaj Teb hais txog cov yam ntxwv ntawm hexagon ntsawb khawm lub taub hau screws nrog dab tshos nrog xov los ntawm M3 mus txog thiab suav nrog M16, nrog cov khoom qib A thiab nrog txo loadabilit
