Plastic worm gears
Owing to their poor thermal conductivity, plastic worm gears are only suitable for low sliding speeds of < 1.5 m/s and medium tooth flank loading. The worm must be hardened and must have ground flanks.
Plastic worm gears have around 60% of the torque capacity of comparable bronze worm gears (this applies for use with mineral grease).
Bronze worm gears
Cu Sn 12 DIN 1705
Relatively soft material with good wear resistance: suitable for high sliding speeds.
Cu Sn 12 Ni DIN 1705
Relatively soft material with very high wear resistance: suitable for very high sliding speeds.
CuAl10Fe3 Mn2 DIN 17665 / 17672
Relatively hard anti-friction materials for high loads and relatively low rotational speeds.
Please find more details at our Worm gear set catalog.