High Quality Four-point Contact Ball Bearing QJ 304 N2PHAS QJ 304 MA QJ 304 N2MA 20*52*15mm for Rock Drill
V1, V2, V3
OEM customized services
P0, P6,P5,P4 P2
1. Industrial packaging: plastic bag/plastic tube + craft paper + carton + plywood pallets
2. 2. Commercial packing: 1pc/plastic bag + color box + carton + plywood pallets
3. 3. As the clients' requirement
Shipped in 2 days after payment
Angular contact ball bearing uses axially asymmetric races. An axial load passes in a straight line through the bearing, whereas a radial load takes an oblique path that tends to want to separate the races axially. So the angle of contact on the inner race is the same as that on the outer race.
Angular contact bearings better support "combined loads" (loading in both the radial and axial directions) and the contact angle of the bearing should be matched to the relative proportions of each. The larger the contact angle (typically in the range 10 to 45 degrees), the higher the axial load supported, but the lower the radial load. In high speed applications, such as turbines, jet engines, and dentistry equipment, the centrifugal forces generated by the balls changes the contact angle at the inner and outer race. Ceramics such assilicon nitride are now regularly used in such applications due to their low density (40% of steel). These materials significantly reduce centrifugal force and function well in high temperature environments. They also tend to wear in a similar way to bearing steel—rather than cracking or shattering like glass or porcelain.
Most bicycles use angular-contact bearings in the headsets because the forces on these bearings are in both the radial and axial direction.
Angular contact ball bearing type:
Single row angular contact ball bearing: only carry a direction of the axial load, when in bear radial load, can cause additional axial force must be applied to the corresponding reverse load, therefore, the bearings are generally used in pairs.
Double row angular contact ball bearing: At the same time can bear radial and axial load joint load, limit shaft on both sides of the axial displacement.
Angular contact ball bearing main technical indicators:
(1) Bearing precision index: More than GB / 307.1-94 P4 level accuracy
(2) High-speed performance index: 1.3~1.8x 106 /min
(3)Service life:more than 1500h
1) Load capacities are higher than deep groove ball bearings of same dimensions
2) Used for bearing radial-axial combined loads or pure thrust loads
3) Low operating friction and high limiting speed
1). Single row angular contact ball bearings
2). Double row angular contact ball bearings
3). Four-point contact ball bearings
/DB: Mount in duplex, back to back
/DF: Mount in duplex, face to face
/DT: Mount in duplex, tandem
Tolerance & Precision.
Accuracy from low to high is expressed as P0 ( general ), P6 (P6X), P5, P4, P2
The main application:
Single row angular contact ball bearings:
machine tool spindles, high frequency motors, gas turbines , centrifuges, small car front wheel , differential pinion shaft , booster pumps, drilling platforms, food machinery, dividing head, fill welding , low-noise cooling tower , electrical and mechanical equipment, painting equipment , machine slot board , arc welding machine
Double row angular contact ball bearings:
pump, blower , air compressor , various types of transmission , fuel injection pump , printing machinery , planetary reducer, extraction equipment , cycloid reducer , food packaging machinery , welding machines, electric irons, square box , gravity gun , wire strippers , axle, test analysis equipment , chemical machinery.
If you are interested in our products, you can click on the "send my inquiry" to us for help, we will provide help for you in 1 hour.
Jinan JiaRuiDa Mechanical&Electrical Equipment Co., Ltd. teamed up with strong bearing production enterprises, can produce deep groove ball bearings, self-aligning ball bearings, angular contact ball bearings, cylindrical roller bearing, tapered roller bearing, spherical roller bearing, needle bearing, insert ball bearing unit, and other type bearing with different levels of precision products.
Our products are widely used in metallurgy, mining, chemical industry, petroleum, machinery and other industries, with the domestic each big enterprise cooperation for many times, in the international market, products have been sold to the United States, Germany, Austria, Brazil, Russia, Ukraine, South Korea, India, and other countries and southeast Asia, the Middle East.
Our company through the ISO14001:2004 international quality management system certification, ISO9001:2000 international quality management system certification, complete testing means for the production of quality products provides a reliable guarantee.Measurement center, testing center and laboratory are adopted at home and abroad the most advanced testing instruments, meters and bearing test device, ensure the accuracy of all tests, complete processing equipment provides a strong guarantee for improving production ability.Forging mainly used grinding ring, machining is given priority to with numerical control lathe automatic or semi-automatic, heat treatment used the well type annealing furnace, pit type carburizing furnace, push rod annealed wire and a protective gas quenching line at home and abroad advanced equipment, guarantees the quality of bearing.
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Our sales process
Our related services
We accept OEM
Why choose cooperation with us?
1,Excellent and high quality control
2,Customers' drawing or samples accepted
5,Small order accepted
7,we accept a variety of payment
8,our service time is 7 * 24
9, we are specializing in the production of bearing more than 10 years
Q: Are you trading company or manufacturer ?
A: We are factory.
Q: How long is your delivery time?
A: Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.
Q: Do you provide samples ? is it free or extra ?
A: Yes, we could offer the sample for free charge but do not pay the cost of freight.
Q: What is your terms of payment ?
A: Payment<=5000USD, 100% in advance. Payment>=5000USD, 30% T/T in advance ,balance before shippment.
Q:Can you give me discount?
A:Yes,of course.And we will quote you lowest price at the beginning.
Q:What should I do if the bearings has something wrong?
A:oh!We will try our best to help you and set up long time cooperation.
Working time,working environment,usage way will influence the life of bearings.
Q:Do you like to serve clients with small orders only?
A:We would like to serve clients with all kinds of orders,big or small.
I believe that you will be larger clients for us.
Address:#206 Lu fu business center, jing si road and wei shi er road crossing, Huai yin distric, Jinan city, Shandong province.