SIG Slew rings

SIG Slew rings

SIG Slew rings

The SEG series represents a sophisticated class of dual-row ball slewing rings engineered for medium- to heavy-duty rotational applications requiring compact design and high load-bearing capacity. Distinguished by its internal gear configuration, this series is specifically developed for equipment where space optimization and precise torque transmission are critical.



Typical Areas of Application

  • Construction and lifting machinery, including tower cranes, mobile cranes, and crawler cranes

  • Earthmoving equipment such as excavators and backhoe loaders

  • Material handling systems, including stackers, reclaimers, and conveyor transfer points

  • Renewable energy installations, particularly wind turbine yaw systems

  • Industrial rotary tables and heavy-duty positioning equipment

  • Special-purpose vehicles and mobile platforms



  • SIG Slew rings
  • SIG Slew rings
InquiryTypeBrandOutline DimensionOuter HolesInner HolesGear InformationWeight
Da [mm]Di [mm]H [mm]La [mm]naLi [mm]niP [mm]MZFzMaxKG

The SEG series covers professional double-row ball slewing bearings equipped with internal gear structures, purposely built for high-stability rotary equipment in confined installation spaces. Different from externally geared models, this series adopts an inner-tooth transmission design paired with a dual-row steel ball arrangement, combining compact structural integration, excellent load-bearing performance and protected gear transmission characteristics. It is widely favored for medium-heavy duty machinery that demands high precision, neat assembly layout and long-term operational reliability.

The dual-row ball raceway layout serves as the fundamental guarantee for the bearing’s superior mechanical performance. Two layers of precision steel balls are arranged in a scientifically optimized track spacing, cooperating with thermally hardened raceway surfaces to undertake compound loads in multiple directions simultaneously. This structural design effectively disperses axial pressure, radial force and dynamic overturning torque, avoiding local stress accumulation during equipment operation. It greatly improves overall structural rigidity, effectively suppressing rotational shake and running friction, and maintains stable rotary accuracy even under long-duration continuous operation and frequent load fluctuations.


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