AS 1897-1976

Specifies coating thickness, gauging after coating and other requirements for coatings on ISO metric triangular form threaded items specified in various Australian Standards. It covers tolerance classes 6H with G deviation, and 6G for nuts, and 6g, 6e and 8g for screws and bolts. Details of preplating thread dimensions for standard coating thicknesses and procedures for the modification and extent of modification to cater for thicker coatings are included. Surface areas of threaded items, statistical treatment for probability of acceptance by 'GO' gauge and recommended sampling procedures are dealt with in appendices.