Indications approximatives en mm:1/4 pouce = 12,5mm3/8 pouce = 16mm1/2 pouce = 19mm3/4 pouce = 26mm1 pouce = 32mm1 1/4 pouce = 40mm1 1/2 pouce = 48mm2 pouces = 59mmIG= filetage intérieurAG= filetage extérieur