Material: Special brass CuZn37Mn3Al2PbSi/So. Pressure angle 15°. The gear wheels can only be used with worms having the same centre distance and the same transmission. Can be built into gear systems, no reworking required, thus short assembly times. * Worm only polished - worm gear with helical gearing. ** The figures stated for the efficiency are only reference values, since - besides the lead angle - also mounting, lubrication, speed and assembly have an influence on the efficiency.