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Metric X-type Thin Wall Four Point Contact Ball Bearings

Metric X-type Thin Wall Four Point Contact Ball Bearings,integrating crossed contact structure, metric precision manufacturing, and thin-wall enhancement technology, achieve a 35% increase in axial stiffness and 80% higher rotational speed while being 40% lighter, ideal for high-precision, lightweight applications in robotics, aerospace, and other advanced industries.

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	Type	Main dimensions			Rated load		Rated speed
					Dynamics	Static	Speed limit
Mail		d[mm]	D[mm]	B[mm]	C[kN]	C₀[kN]	[r/min]
	LKJU075XPO	190	209	12	42090.0	14540.0	-
	LKJU075XPO 2RS	190	209	12	42090.0	14540.0	-
	LKJU070XPO	177	196	12	39430.0	13910.0	-
	LKJU070XPO 2RS	177	196	12	39430.0	13910.0	-
	LKJU065XPO	165	184	12	36760.0	13290.0	-
	LKJBO65XPO	165	180	7	30720.0	10400.0	-
	LKJA065XPO	165	177	6	22760.0	7330.0	-
	LKJU065XPO 2RS	165	184	12	36760.0	13290.0	-
	LKJBO65XPO 2RS	165	180	7	30720.0	10400.0	-
	LKJA065XPO 2RS	165	177	6	22760.0	7330.0	-
	LKJU060XPO	152	171	12	34050.0	12620.0	-
	LKJBO60XPO	152	168	7	28450.0	9870.0	-
	LKJA060XPO	152	165	6	21070.0	6980.0	-
	LKJU060XPO 2RS	152	171	12	34050.0	12620.0	-
	LKJBO60XPO 2RS	152	168	7	28450.0	9870.0	-
	LKJA060XPO 2RS	152	165	6	21070.0	6980.0	-
	LKJUO55XPO	139	158	12	31380.0	11960.0	-
	LKJBO55XPO	139	155	7	26180.0	9340.0	-
	LKJAO55XPO	139	152	6	19380.0	6580.0	-
	LKJUO55XPO 2RS	139	158	12	31380.0	11960.0	-

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Innovative X-Contact Geometry

Crossed four-point contact design (combined contact angles α=35°/55°) increases axial stiffness by 18% over conventional four-point bearings
Optimized stress distribution ensures maximum contact stress <1,800MPa under radial load P_r=8.5kN

Metric Precision Manufacturing

Full compliance with ISO 492:2018 metric standards (bore d=10-100mm, OD D=26-150mm)
Raceway roundness error ≤1.2μm, rotational accuracy meeting P4 class (GB/T 307.1)

Thin-wall Enhancement Technology

0.8-1.5mm ultra-thin rings (wall thickness/diameter ratio <0.03) treated with vacuum quenching + ion nitriding
Dynamic stiffness K_r=1,200N/μm at rotational speed n=12,000rpm

Application

The bearings can be used in the following industries

Industrial Robotics: SCARA robot wrist joints (repeatability ±0.02mm)
Aerospace: Satellite solar panel drives (15-year service life / 5×10^5 cycles)
Precision Metrology: CMM rotary tables (runout ≤3μm)
Medical: Da Vinci surgical robot arms (10^6 fatigue cycles under alternating loads)