DIN 2986 SOCKETS STANDARD
   
ND inch 1/8" 1/4" 3/8" 1/2" 3/4" 1" 1.1/4" 1.1/2" 2"
mm 6 8 10 15 20 25 32 40 50
OUTSIDE DIAMETER(min) mm 14 18.5 21.3 26.4 31.8 39.5 48.3 54.5 66.3
LENGTH(min) mm 17 25 26 34 36 43 48 48 56