Crossed Cylindrical Roller Bearings for Robots

PMK Crossed Cylindrical Roller Bearings for Robots are high-precision, compact bearings designed to support combined radial, axial, and moment loads in robotic joints and precision rotary mechanisms.

The crossed roller arrangement provides high rigidity, minimal friction, and accurate rotation — ideal for applications requiring high positional repeatability and smooth multi-axis motion.

Key benefits

Compact design supporting loads in all directions.
High rigidity and low rotational torque for smooth robotic movement.
Excellent repeatability and accuracy under multi-axis operation.
Long life with precision-ground raceways and roller alignment.
Suitable for both lightweight and industrial robotic systems.

Applications

Robotic arms and automation joints.
Precision rotary tables and indexing heads.
CNC machine heads and aerospace actuators.
Optical instruments and assembly robots.

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Specifications

Boundary dimensions (mm)				Basic load ratings (kN)		Designations	Mass (kg)
d	D	B	r_min	C_a	C_oa	Designations	Mass (kg)
30	55	10	0.5	9.25	6	CRB3010	0.13
40	65	10	0.5	10.41	8	CRB4010	0.16
50	80	15	0.5	21.08	15	CRB5015	0.25
60	90	15	1	22.85	18	CRB6015	0.4
70	100	15	1	24.48	20	CRB7015	0.45
80	130	20	1	39.39	34	CRB8020	1.25
90	140	20	1.5	41	37	CRB9020	1.37
100	150	20	1.5	43	39	CRB10020	1.48
110	160	20	1.5	45	43	CRB11020	1.61
120	180	25	2	91	75	CRB12025	2.68
130	190	25	2	95	79	CRB13025	2.86
140	200	25	2	98	85	CRB14025	2.86
150	210	25	2	101	89	CRB15025	3.22
150	230	30	1.1	108	95	CRB15030	4.11
200	260	25	2.5	115	116	CRB20025	4.11
250	310	25	3	128	141	CRB25025	5
300	395	35	3	226	263	CRB30035	13.75
400	510	40	3.5	314	390	CRB40040	23.8
500	600	40	3.5	348	472	CRB50040	26.19
500	625	50	3	405	536	CRB50050	41.7
600	700	40	3	410	550	CRB60040	29