8943-75 61 Ductile iron and steel fittings with parallel thread for pipelines. Nomenclature 23.040.60 1977-01-01 14.11.75 N 2901 01.01.77 , ( 2-93) . 2010 .1. , , - ( ) , , (, , .), 175 : 1. 6 (16 ) 40 1 (10 ) 50-100 .2. .