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KH Series Slewing Ring Bearings KAYDON Part No.

KH series slewing bearings have a rectangular cross-section, range in size from 16–37 inches OD (400–950 mm), and are generally available from stock.

gear Outline dimensions & weight Max gear
tooth load Fz
KH-125E External gear 16.500 8.625 12.750 12.250 75 5,480
KH-125P No gear 16.500 8.625 12.750 12.250 80 -
KH-166E External gear 20.500 12.750 16.875 16.375 100 5,570
KH-166P No gear 20.500 12.750 16.875 16.375 105 -
KH-225E External gear 26.667 18.500 22.750 22.250 140 5,670
KH-225P No gear 26.700 18.500 22.750 22.250 150 -
KH-275E External gear 31.667 23.500 27.750 27.250 175 5,700
KH-275P No gear 31.700 23.500 27.750 27.750 185 -
KH-325E External gear 36.667 28.500 32.750 32.250 205 5,730
KH-325P No gear 36.700 28.500 32.750 32.250 220 -

Design Features

The internal configuration is a deep groove gothic arch raceway, which provides four points of contact with the balls, enabling it to carry radial, moment, and thrust loads individually or simultaneously. The use of internal diametral preload provides for greater stiffness, which combined with tightly controlled radial and axial runouts, delivers accurate repeatability. The axial runouts are 0.001 inches TIR and the radial runouts for locating diameters are 0.002 inches TIR. A separator is used to maintain consistent ball spacing interval, keep friction to a minimum, and minimize noise. Integral face riding seals are provided to assist in the exclusion of contaminants.

KH series precision bearings are offered in nongeared and externally geared configurations. The gears have full depth involute teeth and are manufactured to an AGMA Class Q8 quality, allowing for decreased backlash, more accurate positioning, and less noise while operating.


    KH series slewing ring bearings have been used successfully in applications demanding higher precision, including:

  • Precision rotary index tables
  • Radar antennas
  • Satellite antennas
  • Robots
  • Medical systems and medical devices
  • Machine tool tables
  • Any design where the KH bearing will interface with other precision components



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