6903 2RS, 2rz, 2z 17*30*7 mm High Quality, Long Life, High Precision, Deep Groove Ball Bearing

• Motor Parts: Motor Bearing
• Water Pump Parts: Water Pump Bearing
• Air Compressor Parts: Air Compressor Bearing
• Shipping Cost: Estimated freight per unit.: about shipping cost and estimated delivery time.
• Currency: US$
• Return&refunds: You can apply for a refund up to 30 days after receipt of the products.
• Model NO.: 6903
• Auto Parts: Automotive Alternator Bearing
• Automotive Gearbox Parts: Automotive Gearbox Bearing
• Power Tools Parts: Power Tool Bearing
• Robot Parts: Thin Wall Bearing
• Nevs Motor: Nevs Motor Bearing
• Aligning: Non-Aligning Bearing
• Separated: Unseparated
• Rows Number: Single
• Load Direction: Radial Bearing
• Material: Bearing Steel
• Contact Angle: 0°
• Transport Package: as Customer Required
• Specification: 17 30 7 mm
• Trademark: DARM
• Origin: Zhejiang China
• HS Code: 8482102000
• Production Capacity: 30, 000, 000 Pieces/Year
• Package Size: 13.00cm * 8.00cm * 9.00cm
• Package Gross Weight: 1.000kg

Product Description

Product Description

6900 series deep groove ball bearings

 

Bearing NO	(mm)Boundary Dimensions			(Kn)	(Kn)	(r/min) Limit Rotational Speed
	d	D	B	Dynamic Load Rating Cr	Static Load Rating Cor	Grease Lubrication	Oil Lubrication	(Kg) Weight
6900	10	22	6	2.7	1.27	32000	38000	0.01
6901	12	24	6	2.91	1.46	30000	36000	0.011
6902	15	28	7	4.35	2.26	26000	30000	0.016
6903	17	30	7	4.6	2.55	24000	28000	0.016
6904	20	37	9	6.4	3.7	19000	22000	0.0358
6905	25	42	9	7.05	4.55	16000	19000	0.0409
6906	30	47	9	7.25	5.0	14000	17000	0.0513
6907	35	55	10	10.6	7.25	12000	15000	0.078
6908	40	62	12	13.7	10.0	11000	13000	0.112
6909	45	68	12	14.1	10.9	9500	12000	0.14
6910	50	72	12	14.5	11.7	9000	11000	0.14
6911	55	80	13	16.0	13.3	8000	9500	0.179
6912	60	85	13	16.5	14.3	7500	9000	0.193
6913	65	90	13	17.4	16.1	7100	8500	0.206
6914	70	100	16	23.7	21.2	6300	7500	0.341
6915	75	105	16	24.4	22.6	6000	7100	0.362
6916	80	110	16	25.0	24.0	5600	6700	0.381
6917	85	120	18	32.0	29.6	5300	6300	0.527
6918	90	125	18	33.0	31.5	5000	6000	0.559
6919	95	130	18	33.5	33.5	4800	5600	0.586
6920	100	140	20	43.0	42	4500	5300	0.83
Note:Above-mentioned products include its modification series,such as Z,2Z,RS,and 2RS etc.

DARM deep groove ball bearings for motors
In order to meet the vibration, noise and energy consumption requirements of the motor industry in China, the new deep groove ball bearings designed by DARM reduce the vibration, noise and energy consumption levels of the motor in any application, while also extending the service life of the motor.
Advantages: 
Low vibration and noise to ensure smooth operation of the motor; 
Less bearing friction, improve motor efficiency and reduce motor energy consumption; 
Capped bearing with special grease for extended service life; 
Improve reliability and reduce end-customer costs.

DARM deep groove ball bearings for water pump
In order to meet the noise, lift and energy consumption requirements of the water pump industry in China, the new deep groove ball bearing designed by DARM for water pump improves the axial load of the bearing by changing the internal structure design of the bearing, reduces the noise and energy consumption level of the water pump in any application, and also extends the service life.
Advantages: 
Low vibration and noise ensure smooth operation of the pump; 
Lower bearing friction, improve efficiency and reduce energy consumption; 
Capped bearing with special grease, worry-free starting at -40ºC; 
Large axial load, improve reliability, extend service life.

DARM special roller bearings for mining machinery
In order to solve the problems of poor waterproof and dustproof performance and short service life of roller bearings in China's mining machinery industry, the new type of roller bearings designed by DARM improve the waterproof and dustproof performance of bearings by changing the bearing seal structure, and also extend the service life.
Advantages: 
High water and dust resistance and low torque ensure smooth operation of the equipment; 
Capped bearing with special grease for extended service life; 
Easy to use and install, improve customer installation efficiency; 
Reduce the cost of use for end users.

DARM special bearings for high speed servo motor
In order to meet the requirements of Chinese servo motor industry for low noise and long life of high speed servo motor, the new high-speed servo motor special bearings designed by DARM reduce the noise of bearings and greatly improve the service life by using silicon nitride ceramic ball as the rolling body and polymer nylon retainer.
advantage
The use of silicon nitride ceramic ball as the rolling body greatly improves the service life
The use of special grease to meet the stable operation of more than 12000 RPM
Use polymer nylon retainer to reduce friction and noise
Improve reliability and reduce operating costs

DARM special bearings for oil-free air compressors
In order to meet the special requirements for bearings in the emerging industry of oil-free air compressors in China, DARM has designed a new type of oil-free special bearings, and the large-sized anti-wear bearings can easily bear all the loads to ensure the normal operation of the main engine.
advantage
Anti-wear heat treatment process, greatly improve the service life
Special inner and outer diameter design, can easily bear all the load
Special grease is used to ensure smooth operation of the equipment
High sealing performance, low noise

DARM special bearings for gasoline engine
Gasoline engine is a kind of machine widely used in people's lives, and it has higher requirements for bearings. The special engine bearings designed by DARM greatly enhance the ability to resist foreign body rolling and fully meet the special working environment of the engine.
advantage
The use of carbonitriding heat treatment technology greatly enhances the ability of resisting foreign body rolling and prolonging the service life
Low vibration and noise to ensure smooth operation
Suitable for any type of oil lubrication


DARM special bearings for automotive generators
In order to meet the requirements of high temperature resistance, low noise and high sealing performance of bearings for automotive generators, DARM designed a new type of special bearings for automotive generators, using a special heat treatment process and high temperature resistant rubber seals, so that the bearings can still operate easily in the working environment of -40ºC -180ºC to ensure the smooth operation of automotive generators.
advantage
Low vibration, low noise
Special heat treatment process, improve the service life
High temperature rubber seals are used to improve sealing performance and prevent aging
The use of special grease, so that the bearing in the working environment of -40ºC -180ºC can still easily run


DARM special bearings for robot
With the rapid development of modern industry, industrial robots have quietly risen, and the new thin wall robot special bearings designed by DARM can withstand comprehensive loads in axial, radial, overturning and other directions to ensure more flexible and accurate robot operation.
Advantages: 
Low friction torque, high rigidity, good rotation accuracy; 
High precision, strong bearing capacity; 
Miniaturization, lightweight; 
Noiseless.

DARM special bearings for the automotive tension pulley
In order to meet the requirements of the Chinese automotive industry for the vibration, noise and life of the automotive tension pulley, the new special bearings designed by DARM reduce the vibration and noise level of the tension wheel in any application, while also extending the service life.
advantage
Low vibration and noise to ensure smooth operation
Use special greases to ensure proper lubrication at high rotational speeds
Use high temperature rubber seals to ensure sealing performance, prevent aging and extend life


DARM special bearings for air compressor
For the air compressor, the bearing is a very important part, the bearing is good or bad, directly affect the life of the air compressor. The new air compressor bearings designed by DARM ensure the smooth operation of air compressors in any application.
Advantages: 
Low vibration and noise to ensure smooth operation; 
Suitable for any type of oil lubrication; 
Anti-wear heat treatment process, greatly improve the service life.

DARM 62200 series bearings
Mainly used in storage tank, wire peeling machine, stir-frying machine, gear, impact testing machine, horizontal sawing machine, trap, packaging machinery, magnetic element, strength testing machine, thread processing machine, high purity water production equipment, mechanic equipment, vehicle lights and other equipment.
advantage
It has superior axial carrying capacity
Low vibration and noise to ensure smooth operation
Use special greases to ensure proper lubrication at high rotational speeds
Use high temperature rubber seals to ensure sealing performance, prevent aging and extend life

  DARM high-speed heavy-duty 6400 series bearings
Mainly used in high-speed heavy-duty fans, construction machinery, agricultural machinery, machine tools, heavy-duty motors, metal cutting machinery, lifting machinery and so on.
advantage
With high speed, ultra-high radial and axial bearing capacity
Low vibration and noise to ensure smooth operation
Use special greases to ensure proper lubrication at high rotational speeds
Use high temperature rubber seals to ensure sealing performance, prevent aging and extend life


DARM special bearings for power tools
Power tools have brought great convenience to people's lives, but a good power tool cannot be separated from a good bearing. DARM designed special bearings for power tools, with the advantages of high speed, ultra-low noise, ultra-long life. The rotating speed can be as high as 30,000 revolutions, and the noise can reach ZV4 level or above.
Advantages: 
High speed, the speed reaches 30000 RPM or more; 
Low vibration and noise, bring good customer experience; 
The use of special materials and new processes to extend the service life
Improve reliability and reduce end-customer costs.

DARM special bearings for NEVs motor
In order to meet the requirements of China's new energy vehicle motor industry for motor speed, life, vibration, noise, energy consumption, the special deep groove ball bearings designed by DARM for new energy vehicle motor , can meet the motor in the working condition of 15,000 RPM without noise, while the use of special materials and new processes to ensure the service life of the product.
Advantages: 
High rotating speed, to ensure that the NEVs motor 15,000 rotation worry-free operation; 
Low vibration and noise to ensure smooth operation of the motor
Less bearing friction, improve motor efficiency and reduce motor energy consumption
The use of special materials and new processes to extend the service life
Improve reliability and reduce end-customer costs


DARM special bearings for automotive transmission
DARM designed the special bearings for automotive transmission, using high purity bearing steel, through carbonitriding heat treatment and ultra-low temperature freezing processing manufacturing, with high speed, low noise, long life advantages.
advantage
Low vibration and noise, bring good customer experience
The use of special materials and new processes to extend the service life
Improve reliability and reduce end-customer costs


DARM special bearings for automotive steering system
The special bearings for automotive steering system designed by DARM are manufactured by special process according to the requirements of human control comfort and safety, and have the advantages of high precision, no sound and ultra-long life.
advantage
Low friction torque, high rigidity, good rotation accuracy
High precision, strong bearing capacity
Miniaturization, lightweight
noiseless

 

Detailed Photos

 

Black chamfer with rubber seal

Black chamfer with white dust cover


open UG


white chamfer with yellow dust cover


ceramic ball bearing


THE USE OF THE BEARING
Some tips on use
Rolling bearing is a precise part. Therefore it should be used carefully. No matter how high performance the bearing has, it can be obtained by improper use, the followings are the points for attention to use bearings.
(1) Keep clean the bearing and its surrounding areas
It is harmful to the bearing even by tiny dust which can not be seen by human eyes. Therefore it should always keep clean the surrounding environments in order to prevent the bearing from dust corrosion.
(2) Use bearing carefully
Scar and indentation can essily be produced out of strong impact to the bearing in use and become the cause of accidents. Therefore special caution should be given to its use.
(3) Use the appropriate operating tool
Avoid using a hammer or heavy direct tap on a bearing or sleeve, must use appropriate tools such as press or heating.
(4) Be careful to the rust corrosion of the bearings
The sweat in the hands will cause rust in operating the bearings. Therefore your hands should be cleanly washed and dried before operation. You'd better wear gloves in doing the work. 
(5) Handler should familiar with bearing
(6) Establish bearing handling criteri
·Bearing storage
.Bearing and surrounding cleaning
.Dimension of mounting parts and inspection
.Machining quality
.Mounting handing
.After mounting inspection
·Disassembly handing
·Keep maintain
·Adding lubricant

 

Installation Instructions

 Bearing mounting
 Precautions for proper mounting of bearing
1) Bearing preparation
Bearing should not be unpacked until before mounting due to spray anti-corrosion oil and pack anti-corrosion paper. In addition, spray anti-corrosion oil on bearing have good lubricate function. For general purpose, just directly using bearing fill-in grease bearings, without cleaning. However, bearing for instrument or high speed rotating must be cleaned with clean filtered oil in order to remove the anti-corrosion oil. At that time, the bearings are easy to corrosion could not storage long term.
2) Inspection of shafts and housings
Cleaning shaft and housing, confirming no scratched or machine burrs, no abrasive and cutting piece in housing. Secondly comppare with drawing, the shaft and housing of dimension, form and machining quality should be inspected.
chart 1 Measure location for shaft diameter                                                                         chart 2  Measure location for housing bore diameter                       

As chart 1 and chart 2 showing, divided several locations to be measure on shaft and housing bore diameters, It should be careful inspected perpendicular between shaft, housing fillet dimension and shoulder.
Before mounting bearing, it should be sprayed mechanical oil on fitting surface after check out the shaft and housing.


Bearing storage
Before leaving the factory, the bearing is sprayed proper rust-inhibiting oil and packed rust-inhibiting paper. The quality of bearing is guaranteed, if the packing is not broken.
For long-term storage, if the humidity less than 65% and the temperature about 20, it should storage on shelf which is higher 30cm than ground.
In addition, storage occasion should avoid sunshine and contact with cold wall.

Pictures about packaging

 

Company Profile

Our Advantages

1. World-Class Bearing: We provide our customers with all types of indigenous bearing with world-class quality.
2. OEM or Non-Stand Bearings: Any requirement for Nonstandard bearings is Easily Fulfilled by us due to its vast knowledge and links in the industry.
3. Genuine products With Excellent Quality: The company has always proved the 100% quality products it provides with genuine intent.
4. After Sales Service and Technical Assistance: The company provides after-sales service and technical assistance as per the customer's requirements and needs.
5. Quick Delivery: The company provides just-in-time delivery with its streamlined supply chain. 
SAMPLES
1. Samples quantity: 1-10 PCS are available. 
2. Free samples: It depends on the Model No., material and quantity. Some of the bearings samples need client to
    pay samples charge and shipping cost. 
3. It's better to start your order with Trade Assurance to get full protection for your samples order. 

CUSTOMIZED
The customized LOGO or drawing is acceptable for us. 

MOQ
1. MOQ: 10 PCS standard bearings. 
2. MOQ: 1000 PCS customized your brand bearings. 

OEM POLICY
1. We can printing your brand (logo, artwork)on the shield or laser engraving your brand on the shield. 
2. We can custom your packaging according to your design
3. All copyright own by clients and we promised don't disclose any info.