High Rigidity Cylindrical Ra9008 Crossed Roller Bearings for Heavy Loads

Product Description

Product Description

RA Crossed Roller Bearings Product Description

RAcrossed roller bearings are split outer ring type and integrated inner ring design. This structure can minimize the size of inner and outer rings while ensuring the strength of the bearing, and achieve miniaturization. It is suitable for equipment with high space requirements. Generally, there are open type and double end seal type. For example, the RA series has RA (open type) and RA...UU (double end seal), which can be selected according to different use environments and working conditions.

Specification

Model	Static load	Dynamic load	Inner ringrunout P5	Inner ringrunout P4	Preload	Positive clearance	Weight
	Cor(KN)	Cr(KN)	Kia/Sia (mm)	Kia/Sia (mm)	CCo(mm)	co(mm)	m(Kg)
RA5008	7.19	5.1	0.013	0.010	0/-0.008	0/0.015	0.08
RA6008	8.68	5.68	0.013	0.010	0/-0.008	0/0.015	0.09
RA7008	9.8	5.98	0.015	0.012	0/-0.008	0/0.015	0.1
RA8008	11.3	6.37	0.015	0.012	0/-0.008	0/0.015	0.11
RA9008	12.4	6.76	0.015	0.012	0/-0.008	0/0.015	0.12
RA10008	13.9	7.15	0.015	0.012	0/-0.008	0/0.015	0.14
RA11008	15	7.45	0.020	0.015	0/-0.008	0/0.015	0.15
RA12008	16.5	7.84	0.020	0.015	0/-0.008	0/0.015	0.17
RA13008	17.6	7.94	0.025	0.020	0/-0.008	0/0.015	0.18
RA14008	19.1	8.33	0.025	0.020	0/-0.008	0/0.015	0.19
RA15008	20.6	8.82	0.025	0.020	0/-0.008	0/0.015	0.2
RA16013	44.9	23.3	0.025	0.020	0/-0.010	0/0.020	0.59
RA17013	46.5	23.5	0.025	0.020	0/-0.010	0/0.020	0.64
RA18013	49.8	24.5	0.030	0.025	0/-0.010	0/0.020	0.68
RA19013	51.5	24.9	0.030	0.025	0/-0.010	0/0.020	0.69
RA20013	54.7	25.8	0.030	0.025	0/-0.010	0/0.020	0.71

FAQ

Labyrinth Water Barrier – Physical Barrier

Rubber Seal – Precision Interception

Flange O-ring – Static Sealing Eliminates the Risk of Water Leakage.

Utilizing a non-contact labyrinth design, the intruding water flow undergoes multiple deflections, slowing, and depressurization, physically blocking the vast majority of external water sources and particles, forming the first and outermost line of defense

A double-lip seal made of nitrile rubber (NBR) is installed inside the labyrinth, tightly fitting the rotating shaft to provide secondary interception of residual moisture and micron-sized dust, ensuring absolute cleanliness inside the bearing.

A high-temperature resistant silicone O-ring is installed at the mating surface between the bearing mounting flange and the equipment base, completely eliminating the risk of static water leakage at the mating surface, perfectly adapting to harsh industrial environments such as high-pressure cleaning and spraying.

Common Questions

Q1:MOQ & leatd time? 
A: Standard stock items MOQ 1pc, lead time 1-7 days. Custom / P4 high precision order: 15-30 working days.
Q2:Common failure of RA thin wall cross roller bearing? 
A: Abnormal noise: insufficient grease or improper mounting. Sticky rotation: over preload or bad flatness of mounting base. Increased clearance: shock overload. RA thin wall bearing requires rigid mounting seat. Thin aluminum plate base is not suggested.
Q3:Typical applications of RA cross roller bearing? 
A: Robot joints, optical inspection turntable, CCD vision equipment, small CNC index table, semiconductor equipment, medical device, automated rotary fixture.
Q4:Can you offer drawing, 3D STEP file and inspection report? 
A: 2D drawing for standard models, partial items with 3D STEP file. Inspection report can be supplied together with shipment.
Q5: Any requirement for mounting housing? 
A: RA thin wall bearing is sensitive to housing deformation. Good flatness and high rigidity of mounting base are mandatory. Poor housing rigidity will destroy rotary accuracy even if bearing itself is qualified.

Application

Application Areas	Specific applications
Industrial Robots	It is commonly used in the joints of robots, such as elbows and wrists, to ensure the robot's repeated positioning accuracy and smooth operation.
Medical Devices	It is used in some precision medical instruments, such as surgical robots, medical testing equipment, etc., to provide high-precision rotational motion for the instruments.
Measuring instruments	Used in various measuring instruments to help achieve precise measurement and positioning, and ensure the accuracy of measurement results.
Machining	It can be used for rotary tables in machining centers and precision rotary tables. It can withstand radial, axial loads and overturning moments to ensure machining accuracy.

Quality Detecion

Strict Testing Process

The cleaned RB crossed roller bearing is firmly clamped on the workbench of the three-dimensional coordinate measuring machine to ensure that the clamping is firm and does not affect the measurement. Using the manual or automatic measurement function of the three-dimensional coordinate measuring machine, according to the pre-planned measurement path, the probe slowly contacts the bearing measurement point to collect coordinate data. After the measurement is completed, the measurement software automatically processes and analyzes the data and generates a test report. The report covers detailed information such as the measurement value, tolerance range, deviation value, etc. of each test item, and intuitively displays the quality status of the bearing.

Equipment

Our factory is equipped with multiple high-precision CNC lathes, fully automatic grinding machines, precision raceway grinding equipment, intelligent heat treatment production lines, precision flaw detection equipment, and coordinate measuring machines. We can reliably handle orders of both large and small batches, mass-producing general-purpose bearings while also precisely tackling various complex customized products. Leveraging our complete production equipment and mature processes, we can strictly control the precision, hardness, sealing, flatness, load-bearing stability, and service life of bearings, effectively avoiding common industry problems such as processing errors, deformation, excessive clearance, and insufficient wear resistance. We also support customized processing of all types of bearings, covering crossed roller bearings, slewing bearings, SE series slewing drives, precision rotary table bearings, miniature precision bearings, and heavy-duty engineering machinery bearings. We can customize products according to customer drawings, dimensions, load requirements, speed conditions, operating environment, accuracy level, and corrosion protection and sealing needs. We support non-standard size modification, special material replacement, special surface treatment, special pre-tightening structure, zero back gap structure, and customization of multiple sealing solutions. We are perfectly suited to complex working conditions in various industries such as photovoltaic tracking, automation equipment, robots, precision machine tools, construction machinery, medical equipment, testing instruments, and intelligent gimbals.