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    • Shaft Mounted Gearboxes (SMSR)

    Shaft-mounted speed reducers ideal for conveyors, crushers, and bulk material handling.

    Shaft-mounted speed reducers (SMSR) are parallel-shaft helical gear units that slide directly onto the driven shaft and are restrained against rotation by a torque arm rather than bolted to a separate foundation. This mounting approach eliminates the base frame, coupling and alignment work of a foot-mounted drive, which is why SMSRs dominate bulk-material conveyor heads, screw conveyors, mixers and similar continuous-duty machinery. Torque reaches the output hollow bore through two or three helical reduction stages, and the unit's own weight is carried by the shaft it drives.

    Most SMSR ranges offer nominal ratios from roughly 5:1 to 25:1 in two stages, extending to about 40:1 in three-stage builds, with output speeds commonly in the 15-400 rpm band and torque ratings that climb into the tens of thousands of Nm on larger frames. Mechanical efficiency typically sits near 96-98% per gear pass. Gears are generally rated to AGMA 2001/ISO 6336 and cut to ISO 1328 / AGMA 2015 quality grades, with enclosed-drive rating practice following AGMA 6013. Frame sizes are usually catalogued against an AGMA service factor so the buyer can match duty.

    Gears are normally case-hardened alloy steel (20MnCr5 or 18CrNiMo7-6) with ground or lapped profiles running in cast-iron housings on SKF/FAG-equivalent bearings; lip or labyrinth seals and a backstop (anti-run-back) option suit inclined conveyors. The hollow output bore is keyed or fitted with a shrink (taper-bush) disc for quick mounting, and a torque arm with a damping bush absorbs reaction and shock.

    Configuration covers IEC motor adapters or free input shaft, V-belt or direct drive, mounting in horizontal, vertical and tie-rod arrangements, and mineral or synthetic PAO ISO VG 220/320 lubrication selected for ambient and orientation. Correct AGMA service-factor selection against shock load and run hours is the central sizing decision.

    Himalay's MSME partners manufacture shaft-mounted reducers with gear-rating to AGMA/ISO 6336, ISO 9001 quality systems, load and efficiency test reports and traceability; CE (Machinery Directive), ATEX/IECEx for hazardous areas, and SABER (Saudi Arabia) coordinated as part of the standard order flow.

    Horizontal SMSR
    Horizontal SMSR
    Vertical SMSR
    Vertical SMSR
    Tie-Rod SMSR
    Tie-Rod SMSR

    Frequently Asked Questions

    When does a shaft-mounted reducer beat a foot-mounted gearbox?
    An SMSR is generally the better choice when the drive sits on a conveyor or screw shaft and you want to avoid a separate base, coupling and alignment: it mounts on the shaft, reacts torque through an arm, and tolerates the misalignment and start-up shock of bulk handling. Size it on AGMA service factor, not just steady torque — uniform load may need SF 1.0, but moderate or heavy shock and long daily run hours typically push selection to SF 1.4-2.0. High ambient or dusty environments also nudge the frame and lubrication choice upward. A foot-mounted unit tends to win where the load is independently supported or where higher ratios and precise output positioning matter more than mounting simplicity.
    What is the typical MOQ for shaft-mounted reducers?
    It depends on frame size and ratio. For small and mid catalogue frames, typical MOQ starts around 20-50 units per size/ratio; for larger conveyor-duty frames it can fall to 5-10 units, and engineered builds are quotable in low single digits. Mixed-size orders consolidated under one spec package usually accept smaller quantities per line.
    Which certifications and test reports can be supplied?
    Where specified, partner manufacturers supply CE marking under the Machinery Directive, ATEX/IECEx documentation for hazardous-area duty, ISO 9001 quality coverage, and gear load and efficiency test reports referencing AGMA/ISO 6336. Material and heat-treatment traceability on the gear set can be arranged on request.
    What ratios, mounting positions and lubrication are available?
    Ratios typically run about 5:1 to 25:1 in two stages and up to roughly 40:1 in three stages, in horizontal, vertical and tie-rod mounting. Input can be an IEC motor adapter, V-belt drive or free input shaft; output is a keyed hollow bore or shrink disc. A backstop suits inclined conveyors. Lubrication is mineral or synthetic PAO, ISO VG 220/320, with the grade and the AGMA service factor matched to ambient temperature, run hours and shock load.
    Do your partners customise to OEM specifications and approvals?
    A subset of Himalay's partner network supplies SMSR drives to OEMs in material handling, mining, cement and bulk processing. Share your spec, duty class or drawing at inquiry stage and we match a qualified partner; end-client approvals and supplier audits can be arranged on a supplier-development track.
    What is the lead time to a European or GCC port?
    Catalogue frames usually take 4-7 weeks to manufacture, test and pack; engineered or large units run 10-14 weeks. Full CIF to Rotterdam, Antwerp, Jebel Ali or Dammam is typically 8-12 weeks door-to-door for standard units and 14-20 weeks for engineered specials.
    Request a Quote for Shaft Mounted Gearboxes (SMSR)
    Padamade Private Limited
    IndiaHiranandani Estate, Patlipada, Off G.B Road, Thane West, Maharashtra, India, 400607
    NetherlandsBreitnerstraat, 3015 XG Rotterdam
    UAE804, KM Trading Building, Najda Street, Abu Dhabi City, Abu Dhabi
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