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HT10-30E1Z Slewing Ring Bearing Turntable Bearing for Cranes

Part Number HT10-30E1Z
Maximum Allowable Gear Tooth Load (Fz) 18393lbs | 82.112KN
Moment Load Rating (Crm) 340000ft-lbs | 1517.857KN
Bearing Types Slewing Ring Bearing

HT10-30E1Z Slewing Ring Bearing Turntable Bearing for Cranes

HT Series slewing ring bearings are larger versions of the HS Series, with increased ball diameter and cross-sectional area providing substantially more capacity. They range in size from 36 – 66 inches OD (900 – 1700 mm) with a standard cross section.

Design Features

The internal configuration consists of deep groove gothic arch raceways and maximum ball complement. This results in a four-point contact design which provides exceptional moment, thrust, and radial load capacities. Integral seals are provided to assist in the exclusion of contaminants.

Geared rings have tapped holes, while non-geared rings have through holes.

HT Series bearings are available in internal geared, external geared, and nongeared configurations. The gears are Involute Stub designs with 20° pressure angles, manufactured to AGMA Class Q5 and .015 to .025 inches allowance for backlash.

All models feature two fittings for lubrication, spaced 180 degrees apart. On non-geared and internal geared models, the fittings are located on the outer diameter (Do). On the external-geared models, the fittings are located on the inner diameter (di).

ht internal gear.JPGht external gear.JPG


HT Series bearings are made to order and can require a longer lead time as forgings are not stocked.


HT Series bearings have been used successfully in a variety of medium to heavy duty applications including:

❚ Cranes❚ Aerial lifts❚ Digger derricks❚ Chute swivels❚ Lift truck rotators❚ Industrial turntable


Part NumberHT10-30E1Z
Maximum Allowable Gear Tooth Load (Fz)18393lbs | 82.112KN
Moment Load Rating (Crm)340000ft-lbs | 1517.857KN
Bearing TypesSlewing Ring Bearing
Outline Dimensions and Weight
Outside Diameter of Outer Ring (Do)35.84" | 910.34mm
Inside Diameter of Inner Ring (di)24" | 609.6mm
Internal Diameter on Outer Ring (Di)-
External Diameter on Inner Ring (do)-
Approximate Weight (lbs)398lbs | 180.529KG
Mounting Holes
Bolt Circle in Outer Ring (Lo)32.75" | 831.85mm
Number Holes in Outer Ring (no)24
Bolt Circle in Inner Ring (Li)26.75" | 679.45mm
Number Holes in Inner Ring (ni)30
Gear Data
Pressure Angle of Gear Teeth (α)20°
Pitch Diameter (D2)35.2"
Diametral Pitch (Pd)2.5
Number of Teeth (z2)88