The ship's bells covered by this specification are intended for use on the following:

Bellmouth dia. Mass weight Usage 150 and 200 1.4 and 2.2 Small crafts less than 12 meters in length. 200 4.5 Boats 12 meters and over in length but less than 20 meters, and ships watch and fire bell. 250 9.0 Navy and marine craft 12 meters and over in length but less than 20 meters in length. Submarines less than 100 meters in length. 300 14.0 Ships and boats 20 meters and over in length but less than 50 meters. Submarines over 100 meters in length. 360 27.0 Ships 50 meters or over in length but less than 75 meters. 400 34.0 Ships 75 meters or over in length but less than 150 meters. 550 90.0 Ships 150 meters or over in length.