Precision Angular Contact Bearings

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Angular Contact Ball Bearings

An angular contact ball bearing is a type of rolling bearing designed to handle both radial and axial loads. People call forces in combination loads. The key point about an angular contact bearing is the inner and outer raceways are angled in relation to the axis of the bearing so the rolling elements(typically balls) make contact at an angle.

High-speed precision angular contact ball bearings are mainly used on high-speed rotating occasions with light loads that need high precision bearings with high speed, low temperature rise, low vibration, and a certain service life. Often used as a pair of high-speed motorized spindle support, is the internal surface grinder high-speed motorized spindle key accessories. The high limit speed of contact ball bearing can receive both radial and axial loads at the same time, and can also bear pure axial load. The axial load capacity is determined by the contact Angle, and it increases as the contact Angle increases.

Angular contact ball bearings have several types: 7000C type (∞=15°), 7000AC type (∞=25°) and 7000B(∞=40°). The lock of this kind of bearing is on the outer ring, generally the inner and outer rings can’t be separated, and can withstand the radial and axial joint load and the axial load in one direction. The ability to bear the axial load depends on the contact Angle, the larger the contact Angle, the greater the ability to bear the axial load. You can also use bearings to control the axial weight of the shaft or housing in one direction.

Advantages of Angular Contact Ball Bearings

Advantages

Angular contact ball bearings are a variant of deep groove ball bearings, and they offer several significant advantages:

Simple structure.
Higher limit speed.
Lower friction torque.
Can simultaneously bear both radial and axial loads.
For the same outer dimensions, they have a higher dynamic load capacity and static load capacity than deep groove ball bearings.
High rotational precision and low noise.

Therefore, they are the preferred bearings for high-speed, high-precision, and low-noise precision shaft systems.

Types

Since angular contact ball bearings are a variant of deep groove ball bearings, any series derived from deep groove ball bearings can be transformed into angular contact ball bearings. Common deep groove ball bearing series include 6000, 6200, 6300, 6400, 61800, 61900, etc., with corresponding angular contact ball bearing series being 7000, 7200, 7300, 7400, 71800, 71900, and so on.

Technical specifications and parameters

For more specifications, please contact us for consultation.

To understand the meaning of bearing model letters, please click

Model	Size				RATED LOAD
Model	d(mm)	D(mm)	B(mm)	r(min.)	Static C(N)	Dynamic C(N)
7305 B	25	62	17	1.1	24 400	14 600
7906 A5	30	47	9	0.3	7 850	5 950
7907 A5	35	55	10	0.6	11 400	8 700
7008 A	40	68	15	1	19 500	15 400
7000 C	10	26	8	0.3	5 300	2 490
7201 A	12	32	10	0.6	8 000	4 050
7214 A	70	125	24	1.5	76 500	63 500
7016 C	80	125	22	1.1	58 500	55 500
7234 A	170	310	52	4	295 500	36 600

Angular Contact Ball Bearing Assembly Form

There are three types of bearing assemblies for two sets: DB type, DF type, and DT type. DB type is called “O” type, and DF type is called “X” type.

There are three types of bearing assemblies: TBT type, TFT type, and TT type.

The four types of bearing assemblies include QFC type, QBC type, QT type, QBT type, and QFT type.

The five types of bearing assemblies include PBC type, PFC type, and PT type PBT type, PFT type.

Bearing Applications

Deep groove ball bearings, as well as the advantages of simple structure, low-cost manufacturing, convenient maintenance, it is also suitable for high-speed running, no noise or low noise, high precision mechanical operation, it is one of the more commonly used bearings. It is used in various industrial fields such as household appliances, automobiles and industrial equipment.

Combine Harvester

Crane

Bulldozer

Loader

Graders

Automobile

Truck

Tractor

Dump Truck

Excavator

Technical Support & After-Sales Service

Technical Support

We provide extensive technical support to make sure you never have any problems using our products and everything is done in a timely fashion.

Help With Your Choice: Don’t know which one to pick? Our technical guys can help you get the bearing you need based on the requirements you give us (load, speed, temperatures, etc.).
How to Install: We provide you with excellent installation documents and video instructions on how to install your bearings.
Troubleshooting: If you’ve got a problem like noise, vibration, or something overheating, I share with you what’s causing the issue and how to fix it like a pro.
Support: Again, any kind of technical questions, you can reach out to us through Live Chat, email, or by phone and we’ll make sure that we get you the help quickly.

After-Sales Service

We’re super committed to after-sale support big-time, so you don’t have to worry about what’s going to happen after you give us your money.

Quality Warranty: Our products come with a 6-month quality warranty. If any of the product has quality problems unartificially, we will replace it for you. We will guarantee the quality of the products we sell to you for 6 months use.
Return & Exchange Policy: If you receive a product with a quality issue, please contact our customer service within seven days, and we will arrange a return or exchange.
Repair Services: We offer global repair support. Please send the item to us, and if it’s broken, we will process the repair and get it back to you as quickly as possible.
Fast Response: MYWAY guarantees we will acknowledge your request within 24 hours of you making an after-sale service request. And we will do our best to have your issue resolved within 48 hours.

Selection of Angular Contact Ball Bearings

How to choose angular contact ball bearings

Which angular contact bearing do we select? The selection of the angular contact bearing will be determined by the operating condition and the available space for the bearing. Generally, the operating condition consists of the speed, the load conditions (how much axial and radial load) which angular contact bearings you should try to use, the lubrication method, etc. address the dominate issue first. If the main issue is speed, then you want a light series bearing with a fifteen-degree contact angle with a higher speed limit. If the main issue is taking high axial loads, then you want a heavy series bearing with a forty-degree contact angle. If you need a bearing to run at a high speed and take a heavy axial load, you want to use the bearings with the twenty-five-degree contact angle. And then you look at the space you have available to mount the bearing. Look in the catalog for the model and check the dynamic load, static load, and speed limit of the angular contact bearing you selected to verify the bearing meets your required speed and length of service life independent of the limiting factor.

Selection of Angular Contact Ball Bearing Precision

In China, there are bearing precision standards. There are different grades of these standards called P0, P6, P5, P4, and P2. P0 is the general grade, produced by a regular cost-effective manufacturing method suitable for mass production. Meaning this is good for you and your company’s budget! Precision gets better as you move from P0 to P2 and all grades relate to the dimensional and rotational precision. They mainly refer to dimensional accuracy and rotational accuracy (radial runout, axial runout, etc.). Dimensional accuracy is inner diameter, outer diameter, and width, which we’ve discussed. Rotational accuracy includes radial runout, axial runout, face-to-bore concentricity, and outer diameter perpendicularity.

From a bearing standpoint, your shaft system has to keep doing its job. You need to pick the right precision. Generally, for systems that need to be super-fast and super-accurate spinning electric motor spindles and computer hard disk drives, you’ll use a 15° contact angle and precision grades P2 or P4.

For systems that need to be medium-fast, much stiffer, and more accurate, you’ll use a 25° angle and P4 or P5. For systems that run slower, are stiffer, can hold more of a load, and last forever but need to be cheaper, you’ll use a 25°, 30°, or 40° angle and grade P0 or P6.

Selection of Retaining Frame for Contact Ball Bearings

Retainers are made with iron, copper, aluminum alloys, and various plastics. These plastics include nylon, polyimide, polytetrafluoroethylene (PTFE), polyether, and phenolic resin fabric (a woven material). In principle, non-metallic retainers are used for high-speed and lighter load applications, while metallic retainers are used for low-speed or heavy loads. Metallic retainers are used for high temperatures. Plastic retainers are used in normal temperatures. Nylon should not exceed 120°C, while PTFE works in very low-temperature environments like liquid ammonia. Phenolic resin fabric works from room temperature up to 150°C, and polyimide after foaming can be used as a self-lubricating cage.

Structurally, there are what we call a stamped steel cage type, an injection molded cage type, a solid metal, a solid plastic, a machined solid metal, a machined phenolic resin fabric. We use cage types in 40⁰ contact angle bearings. We use solid types in 15⁰ and 25⁰ contact angle bearings.

Types of Lubrication Methods for Angular Contact Ball Bearings and How to Choose

Angular contact ball bearings typically have four lubrication methods: oil-air lubrication, oil mist lubrication, oil spray lubrication, and grease lubrication.

– The first is oil-air lubrication which is an intermittent oil drip.

– The second is oil mist lubrication in which oil is broken up or atomized in to the air and sprayed into the bearing.

– The third is oil spray lubrication which is the continuous injection of oil into the bearing.

– The fourth is simply to pack the bearing with grease.

Oil-air lubrication and oil mist lubrication are suitable for ultra-high-speed applications. By using oil-air lubrication, you can increase bearing speed and extend the life of the bearing. The only negative with using oil mist lubrication is that it requires you to use more oil and air compared to oil-air lubrication, and you get oil mist everywhere.

For super high-speed bearings you’ll want to mist oil, or use oil air. For high speed, as well as general speed in most cases you’ll want to spray oil or use grease. Depending on your individual parts and your needs, you can pick one or the other and your best option.

How to Choose Lubricating Grease for Angular Contact Ball Bearings and Control the Grease Filling Amount

Companies that produce grease number in the thousands, and between them, they manufacture hundreds of different greases. You need to consider the operating conditions to which the bearing is subjected when you select the right grease. Those conditions include the speed of the bearing, the load on the bearing, as well as the operating temperature of the bearing. By looking at these conditions and a grease technical parameter chart, you can select the right grease for the job.

The amount of fill is also determined by things like speed, load, and operating temperature. With high-speed, light load applications, the amount of grease in the cavity is typically 20% to 25%. If you put more grease in these bearings, they will churn, make heat, and will probably overheat and fail. On the other hand, with a low-speed, heavy-load application you can fill the bearing with more grease.

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