ISO 7312:1984 PDF

Specifies the essential dimensional characteristics of air filter connections used in road vehicles. Two types are specified: type A - flexible tube connector which include nominal diameters from 20 up to 200 mm (figure 1 and table 1); type B - thread connector which include threads from M8 x 1 up to M33 x 1,5 (figure 2 and table 2).