Crossed Roller Bearings

Home

Products

Crossed Roller Bearings

Slim Cross Roller Bearings

Name: Slim Cross Roller Bearings
Rating: 0 (0 reviews)

BOM manufactures slim and super slim cross roller bearings for collaborative robots, medical robotics, direct-drive rotary stages, and precision instruments. Ultra-compact cross-section delivers full radial, axial, and moment load capability with minimum weight and envelope. Full-specification custom manufacturing and integrated bearing-joint assemblies are available.

Key Features

Ultra-Compact Cross-Section for Weight-Critical Applications
Combined Radial, Axial, and Moment Load Support
Integrated Bearing-Joint Module Assemblies
Standard and High-Precision Grades
Full-Specification Custom Manufacturing Available

Product Inquiry

Product Category

Speak To One of Our Experts

Name can't be empty

Email error!

Message can't be empty

Send message

*We respect your confidentiality and all information are protected.

Description

Reviews

Slim Cross Roller Bearings CRBS CRBT - BOM Bearing

Slim & Super Slim Cross Roller Bearings

Compact Robotics & Medical Ultra-Compact Design

Slim and super slim cross roller bearings deliver full radial, axial, and overturning moment load support in an ultra-compact cross-section. The slim type achieves an exceptional outside-diameter-to-bore ratio for joints and rotating modules where radial space is limited. The super slim type pushes further with a minimal section height and width, purpose-built for lightweight collaborative robots, medical devices, and precision instruments where every gram matters.

Slim Type: Very small OD-to-bore ratio with thin radial cross-section; ideal for compact rotary joints, indexing tables, and direct-drive stages
Super Slim Type: Minimal section height and width; spacer-guided rollers for smooth low-friction rotation; the lightest cross roller bearing available
Load Capability: Full combined radial, bidirectional axial, and overturning moment load support using the proven cross-roller principle in a fraction of the envelope
Weight Reduction: Ultra-thin section enables significant weight savings at every robot joint, directly improving payload-to-weight ratio in collaborative arms and exoskeletons
Sealing Options: Open (standard) and sealed versions available for dust- and contamination-sensitive environments

Slim Cross Roller Bearings: Dimensions & Load Ratings

CRBS/RAU, CRBT, CRBH, RU series | Boundary dimensions per manufacturer standard | Contact us for sizes not shown

CRBS / RAU Series: Equal-Section Slim Type

Equal cross-section profile; IKO designation CRBS, THK designation RAU/RA; identical boundary dimensions

Designation	d mm	D mm	D_pw mm	B / B₁ mm	r_min mm	d_s mm	D_h mm	C_r kN	C_0r kN	Weight kg
RAU/RA5008	50	66	57	8	0.5	53.5	60.5	5.1	7.19	0.08
RAU/RA6008	60	76	67	8	0.5	63.5	70.5	5.68	8.68	0.09
RAU/RA7008	70	86	77	8	0.5	73.5	80.5	5.98	9.8	0.1
RAU/RA8008	80	96	87	8	0.5	83.5	90.5	6.37	11.3	0.11
RAU/RA9008	90	106	97	8	0.5	93.5	100.5	6.76	12.4	0.12
RAU/RA10008	100	116	107	8	0.5	103.5	110.5	7.15	13.9	0.14
RAU/RA11008	110	126	117	8	0.5	113.5	120.5	7.45	15	0.15
RAU/RA12008	120	136	127	8	0.5	123.5	130.5	7.84	16.5	0.17
RAU/RA13008	130	146	137	8	0.5	133.5	140.5	7.94	17.6	0.18
RAU/RA14008	140	156	147	8	0.5	143.5	150.5	8.33	19.1	0.19
RAU/RA15008	150	166	157	8	0.5	153.5	160.5	8.82	20.6	0.2
RAU/RA16013	160	186	172	13	0.8	165	179	23.3	44.9	0.59
RAU/RA17013	170	196	182	13	0.8	175	189	23.5	46.5	0.64
RAU/RA18013	180	206	192	13	0.8	185	199	24.5	49.8	0.68
RAU/RA19013	190	216	202	13	0.8	195	209	24.9	51.5	0.69
RAU/RA20013	200	226	212	13	0.8	205	219	25.8	54.7	0.71

CRBT Series: Miniature Super Slim Type

Compact bore sizes from 10 mm; spacer-guided rollers for weight-critical applications

Designation	d mm	D mm	D_pw mm	B / B₁ mm	r_min mm	d_s mm	D_h mm	C_r kN	C_0r kN	Weight kg
CRBT105	10	21	14.7	5	0.15	12.5	17	1.12	0.8	0.009
CRBT155	15	26	19.7	5	0.15	17.5	22	1.32	1.1	0.012
CRBT205	20	31	24.7	5	0.15	22.5	27	1.49	1.4	0.015
CRBT255	25	36	29.7	5	0.15	27.5	32	1.65	1.77	0.018
CRBT305	30	41	34.7	5	0.15	32.5	37	1.89	2.14	0.021
CRBT355	35	46	39.7	5	0.15	37.5	42	2.05	2.42	0.024
CRBT405	40	51	44.7	5	0.15	42.5	47	2.14	2.74	0.027
CRBT455	45	56	49.7	5	0.15	47.5	52	2.3	3.09	0.029
CRBT505	50	61	54.7	5	0.15	52.5	57	2.43	3.49	0.032
CRBT605	60	71	64.7	5	0.15	62.5	67	2.63	4.09	0.038
CRBT705	70	81	74.7	5	0.15	72.5	77	2.81	4.68	0.044
CRBT805	80	91	84.7	5	0.15	82.5	87	3.05	5.43	0.05
CRBT905	90	101	94.7	5	0.15	92.5	97	3.19	6.03	0.056
CRBT1005	100	111	104.7	5	0.15	102.5	107	3.37	6.63	0.061

CRBH Series: High Rigidity Integrated-Ring Slim Type

Integrated inner and outer ring construction; both rings rotatable; IKO CRBH catalog dimensions with additional BOM sizes

Designation	d mm	D mm	B mm	r_min mm	d_a mm	D_a mm	C_r kN	C_0r kN	Weight kg
CRBH208	20	36	8	0.3	24	31	2.91	2.43	0.04
CRBH258	25	41	8	0.3	29	36	3.12	2.81	0.05
CRBH3010	30	55	10	0.3	36.5	48.5	7.60	8.37	0.12
CRBH3510	35	60	10	0.3	41.5	53.5	7.90	9.13	0.13
CRBH4010	40	65	10	0.3	46.5	58.5	8.61	10.6	0.15
CRBH4510	45	70	10	0.3	51.5	63.5	8.86	11.3	0.16
CRBH5013	50	80	13	0.6	56	74	17.3	20.9	0.29
CRBH6013	60	90	13	0.6	66	84	18.8	24.3	0.33
CRBH7013	70	100	13	0.6	76	94	20.1	27.7	0.38
CRBH8016	80	120	16	0.6	88	112	32.1	43.4	0.74
CRBH9016	90	130	16	0.6	98	122	33.1	46.8	0.81
CRBH10016	100	140	16	1	109	129	31.7	48.6	0.83
CRBH10020	100	150	20	0.6	110	140	50.9	72.2	1.45
CRBH11012	110	135	12	0.6	117	127	12.5	24.1	0.4
CRBH11015	110	145	15	0.6	122	136	23.7	41.5	0.75
CRBH11020	110	160	20	0.6	120	150	52.4	77.4	1.56
CRBH12016	120	150	16	0.6	127	141	24.2	43.2	0.72
CRBH12025	120	180	25	1	132	168	73.4	108	2.62
CRBH13015	130	160	15	0.6	137	152	25	46.7	0.72

RU Series: Integrated Inner/Outer Ring Slim Type

Monolithic ring construction; (G) denotes standard grade, X denotes high-precision grade

Designation	d mm	D mm	D_pw mm	B / B₁ mm	r_min mm	d_s mm	D_h mm	C_r kN	C_0r kN	Weight kg
RU28	10	52	28	8	0.3	24	29.5	2.9	2.4	0.12
RU42	20	70	41.5	12	0.6	37	47	7.35	8.35	0.29
RU52	25	80	52.5	12	0.6	46.5	58.5	8.61	10.6	0.4
RU66	35	95	66	15	0.6	59	74	17.5	22.3	0.62
RU85	55	120	85	15	0.6	79	93	20.3	29.5	1
RU124(G)	80	165	124	22	1	114	134	33.1	50.9	2.6
RU124X	80	165	124	22	1	114	134	33.1	50.9	2.6
RU148(G)	90	210	147.5	25	1.5	133	162	49.1	76.8	4.9
RU148X	90	210	147.5	25	1.5	133	162	49.1	76.8	4.9
RU178(G)	115	240	178	28	1.5	161	195	80.3	135	6.8
RU178X	115	240	178	28	1.5	161	195	80.3	135	6.8
RU228(G)	160	295	227.5	35	2	208	246	104	173	11.4
RU228X	160	295	227.5	35	2	208	246	104	173	11.4
RU297(G)	210	380	297.3	40	2.5	272	320	156	281	21.3
RU297X	210	380	297.3	40	2.5	272	320	156	281	21.3
RU445(G)	350	540	445.4	45	2.5	417	473	222	473	35.4
RU445X	350	540	445.4	45	2.5	417	473	222	473	35.4

Custom Slim Cross Roller Bearing Manufacturing

Integrated Assemblies Robot Joint Modules

Beyond standard catalog sizes, BOM Bearing engineers slim cross roller bearings combined with robot joint housings, output flanges, or encoder mounting features as a single precision-machined unit, eliminating assembly errors and producing a lighter, more compact joint module with higher positioning accuracy.

Integrated Assemblies: Slim bearing combined with robot joint housing, output link, or actuator flange as one unit; more compact structure, smaller envelope, higher moment load capacity than separately assembled components
Precision Advantage: One-piece machining eliminates stack-up errors between bearing rings and mating joint structure, delivering the combined accuracy that separately assembled components cannot match, essential in collaborative robot joints where positioning error accumulates across every axis
Miniature Custom Sizes: Ultra-thin section bearings for miniature medical instruments and exoskeleton finger joints
Weight-Optimized Design: Material selection and section geometry optimized to minimize rotating mass in high-axis-count robot arms without reducing load or precision ratings
Sealing & Environment: Integrated seal solutions for food-grade, cleanroom, and outdoor collaborative robot applications; corrosion-resistant materials for medical use
Customization: Full-specification custom manufacturing available, covering dimensions, materials, coatings, and bearing structure

Custom Slim Cross Roller Bearing Robot Joint Assembly - BOM Bearing

Applications

Collaborative & Service Robots

CRBT super slim bearings reduce joint cross-section and weight in every axis of collaborative robot arms and service robots, improving payload-to-weight ratio and enabling a thinner, more human-friendly arm profile without sacrificing rigidity or positioning accuracy.

Medical Robotics & Surgical Instruments

Minimally invasive surgical robots, robotic endoscopes, and exoskeleton joints use CRBT bearings where compact diameter and light weight are essential, all while carrying the multi-directional loads that a single conventional bearing cannot handle alone.

Direct-Drive Rotary Stages

CRBS slim type bearings support the output of direct-drive torque motors in compact rotary stages. The thin section height keeps the overall stage height minimal while the high moment stiffness maintains angular accuracy under cutting or inspection loads.

Humanoid Robots

CRBS and CRBT bearings are essential for humanoid robot joints, from spine and limb articulation to hand and finger actuation. The ultra-slim section enables a natural human-proportioned arm profile while supporting the precise multi-axis coordination that humanoid motion demands.

About BOM Bearing

BOM Bearing is a professional manufacturer of slim and super slim cross roller bearings, delivering compact, high-rigidity rotary solutions for collaborative robots, medical devices, precision instruments, and direct-drive motion systems worldwide.

Quality Assurance: ISO 9001, IATF 16949, and ISO 14001 certified; quality and environmental standards validated at every production stage
Wide Size Range: Slim and super slim types across the full spectrum; custom sizes outside catalog range available
Custom Manufacturing: Full-specification customization from non-standard dimensions and alternative materials to specialized coatings and complete bearing architecture redesign, engineered to your exact requirement
Technical Support: Engineering team for type selection, application optimization, weight reduction, and integrated robot joint module design
Fast Delivery: Efficient production lines and global logistics network ensuring timely delivery worldwide

Frequently Asked Questions (FAQ)

What is the difference between the slim type and the super slim type?

The slim type (CRBS) has a notably smaller outside diameter relative to the bore; the radial cross-section is thin but still moderate, suitable for compact rotary stages, indexing tables, and direct-drive motors. The super slim type (CRBT) achieves the absolute minimum section height and width; this is the lightest and most compact cross roller bearing available, designed specifically for small robot joints, harmonic drive actuators, and miniature medical instruments. Choose slim type for a thin radial envelope; choose super slim when absolute minimum size and weight are the priority.

How do slim cross roller bearings compare to standard cross roller bearings?

Slim and super slim series handle radial, axial, and moment loads simultaneously using the proven crossed roller principle. The defining difference is the section proportions: slim series prioritize a minimal cross-section and lightweight design, ideal for compact collaborative robot joints, medical instruments, and direct-drive stages where space and weight are critical constraints. For applications requiring maximum stiffness and load capacity in a larger package, the CRBC or CRBH standard series is better suited.

Are slim cross roller bearings suitable for harmonic drive (strain wave) gearbox output?

Yes. CRBS and CRBT bearings are widely used as the output cross roller bearing in harmonic drive (strain wave gear) actuators for robot joints. The slim section height is compatible with the compact actuator envelope, while the high moment stiffness maintains joint positional accuracy under external loads. CRBT bearings are particularly common in smaller harmonic drive actuators used in collaborative robot wrist and elbow joints.

What is an integrated slim bearing assembly for robot joints?

An integrated slim bearing assembly combines the CRBS or CRBT bearing with the robot joint housing, output link, or actuator flange as a single precision-machined component. This eliminates the dimensional clearances and angular errors introduced by bolting separately made parts together. These errors accumulate across every axis of a multi-joint robot arm and reduce end-effector accuracy. The integrated assembly also reduces joint weight and simplifies the robot's mechanical structure.

Can BOM supply bearings smaller than 20 mm bore or in non-standard sizes?

Yes. BOM Bearing manufactures ultra-slim cross roller bearings for miniature medical instruments, exoskeleton finger joints, and precision optical instruments. Custom sizes, custom precision specifications, and integrated assemblies combining the bearing with application-specific joint structures are all available. Contact our engineering team with your bore diameter, section height constraint, load requirements, and application description.

0 Comments

Share your thoughts Showing 6 of 0 reviews

Your rating

Your review *

Your Name *

Enter your Name

Your Email *

Enter your Email

Submit

Get in Touch with Us

Name can't be empty

Email error!

Message can't be empty

error

Send Your Message