Gives limit dimensions of thread for metal or plastic and ceramic lampholders with shade holder rings made of metal or plastic. Dimensions for 'Go' and 'Not go' gauges for shade holder rings and for lampholders are also included. THIS CONSOLIDATED VERSION CONSISTS OF THE SECOND EDITION (2004) AND ITS AMENDMENT 1 (2008). THEREFORE, NO NEED TO ORDER AMENDMENT IN ADDITION TO THIS PUBLICATION.