VSF series
Worm gear reducers and combined units

Worm gear reducers and combined units


The SW reducer, which complements the Motovario NMRV gear reducer, has a shaft height between 30 and 110 mm (Baugrößen 030 bis 105) and a compact round smooth body casing design that reduces the space as much as possible.

For better reliability and compatibility/effectiveness of supply, the gearing, the bearings, the motor flange and the accessories are those of the NMRV series.

Warranty: Two years from date of delivery. 





  • Sizes: 030-040-050-063-075-090-105  
  • Available versions: SW - fitted for motor coupling, ISW - with input shaft, SWL - with torque limiter  
  • Power up to 7,5 kW  
  • Aluminuium units are supplied complete with synthetic oil which allows universal position mounting, with no need to modify lubricant quantity. Moreover units without plugs reduce the risk of oil oxidation and contamination.  
  • Reduction ratios between 5 and 100  
  • Max torque 630 Nm and admissible radial loads max 12.000 N  
  • Cases in die-cast aluminium alloy
  • Worm wheel: bronze Cu Sn12 Ni2 (UNI7013-10)  
  • Ground worm profile ZI (UNI4760)  
  • Excellent mechanical strength while being especially lightweight  
  • Load capacity calculated to BS721-83 and verified according to Niemann  
  • Painted with RAL 5010 blue epoxy-polyester powder
  • Worm gear reducers are available with diffferent combinations: SW+SW and SW+ISW
  • Options: torque arm, feet mounting, output flange, output shaft kit, cover, double extention high speed shaft
  • Downloads
  • Product check list

    To enable us to identify the correct product for your requirements please complete the below form.

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    Motor Type

    Motor Information
    Required field
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    Protection degree

    Gearbox speed (rpm)

    Speed range (rpm)

    Required torque (max/average)

    Description of the application

    Stop-Starts/Hr (Qty) - Duty


    Casing version

    Gearbox mounting

    Mounting position (see catalogue)

    Loading (Please refer to the “Service Factor” paragraph on the catalogue)

    Fr/Fa radial/axial load

    Connection(direct, coupling, belt drive, chain...)

    Minimum Service Factor required

    Certifications/ Regulations required

    Presence of external heat sources ((from sun, environment and/or machines)

    Installation environment
    Type of atmosphere
    The following information is useful and necessary to identify the correct product according to the European ATEX Directive 94/9/CE. Please, fill the blank spaces of this document. Important note: Motovario cannot supply products for Atex 1D/1G or Zone 0

    Type of zone

    Permitted surface temperature
    GAS (Temperature class)


    Motovario, if above information is provided, can confirm harmonization to EN1127-1 and from EN13463-1 to EN13483-8 for: H/HA Series - Helical gear reducers, B/BA Series - Helical bevel gear reducers, S Series - Shaft mounted gear reducers, NMRV/NMRV-P Series - Worm gear reducers.
    In case of order, the information above must be provided to enable the supply of the product necessary certification, file number and data for the nameplate.

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