° Since July 21, 2021, the exceptions of the EU Directive 2011/65/EU (RoHS II) regarding the use of lead as an alloying element in steel (Exception 6a in Annex III) and in copper alloys (Exception 6c in Annex III) expire . In order to give our customers legal certainty with regard to the requirements of the RoHS directive, we have decided to gradually convert our standard worm gear sets to alloys with a lead content of ≤ 0.1% by weight (worm: 11SMn30 / worm wheel: CuZn37Mn3Al2Si). You can recognize the worm gear sets that have already been converted by the new item numbers without spaces (e.g. new: R17U80B / e.g. old: R 17U 80B).
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.
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.
