Views: 0 Author: Site Editor Publish Time: 2025-03-03 Origin: Site
Angular contact ball bearings are a kind of bearings widely used in the high-speed operation and high-precision industry conditions, and their unique structure allows them to operate satisfactorily under the bearing axial and radial load. Angular contact ball bearings differ from the ordinary deep groove ball bearings in that they are produced with a specific contact angle (usually 15°, 25°, 40°）, which can greatly improve the load-carrying capacity and bearing lifespan and is also very well adapted to high-speed and high-load application conditions.
Selecting the right angular contact ball bearings is crucial to the accuracy operation of mechanical equipment, and it has a direct effect on the working accuracy, stability, and reliability of the equipment. For a deeper understanding and use of angular contact ball bearings, LNB Bearing will introduce the angular contact bearing definition, types, and applications in detail for reference and selection of users.
Angular contact ball bearings are rolling bearings with a specific contact angle (usually 15°-40°) between the inner and
outer raceways and the rolling element (balls), the core feature of which is that the contact angle gives the bearings the ability to withstand combined radial and axial loads simultaneously. The contact angle is determined by the asymmetric design of the inner and outer raceways: the shoulder height of the outer raceway is reduced unilaterally, and the curvature of the inner raceway matches the diameter of the steel ball, forming a stable load transfer path. The larger the contact angle, the higher the proportion of axial load bearing, and vice versa, the radial load bearing is mainly.
Angular contact ball bearings require directional mounting, and common combination configurations (such as back-to-back or tandem) can optimize multidirectional load adaptability, and their point contact characteristics support high rotational speeds, but they need to be matched to the load and speed limits.
Angular contact ball bearings can be classified into many types according to their contact angle, materials, row numbers, and so on. Each bearing type has its own unique design and characteristic and application field.
The following are common classifications of angular contact ball bearings:
Angular contact ball bearings can be generally categorized into 15°, 25° and 40° according to the different contact angles. Contact angle refers to the rolling body (i.e. ball) and the inner and outer ring contact line between the angle, it has an important impact on the bearing capacity, stiffness and running performance. The size of the contact angle is directly related to the bearing's ability to withstand the axial load, the larger the contact angle, the bearing can withstand the axial load is also the larger, but at the same time, the radial load bearing capacity will be reduced. Choosing the right contact angle can ensure the efficient operation of the equipment under specific working conditions.
15° angular contact ball bearings are designated with the suffix “C”, such as 7008C, 7206C, etc. They have a small contact angle and are suitable for low to medium axial load applications. With a small contact angle, the bearings are able to provide high-speed performance and are suitable for low to medium axial load applications. It is characterized by the ability to withstand a certain axial load, while having good radial stiffness and accuracy, especially suitable for high-speed and low-load occasions, such as electric motors, precision instruments, dental drills, precision instruments, and so on.
15° Angular contact ball bearing performance:
Radial load ★★★★☆
Axial load bearing ★★★☆☆
Speed ★★★★★
25° angular contact ball bearing suffix code for “AC”, such as 7309AC, 7003AC, etc. Compared with 15° angular contact ball bearings, the 25 ° angular contact ball bearings' axial load capacity is stronger, and suitable for carrying larger axial load occasions. The increased contact angle increases the axial load capacity of the bearing, but its radial load capacity is slightly reduced. Usually, 25° angular contact ball bearings are widely used in machines with large axial force and medium speed, such as machine tool spindles, car gearboxes, washing machine drums, industrial pumps, compressors, etc.
25° Angular contact ball bearing performance:
Radial load ★★★☆☆
Axial load ★★★★☆
Speed ★★★☆☆
40° angular contact ball bearings are designated with the suffix “B”, e.g. 7205B, 7009B, etc. 40° angular contact ball bearings have the strongest axial load carrying capacity of the three angular contact bearing types. Due to the larger contact angle, these bearings are able to withstand higher axial forces and are therefore ideally suited for high axial load applications. Typically, 40° angular contact ball bearings are used in applications that carry heavy axial loads and low speeds, such as heavy machine turntables, heavy machine tool guide rails, wind turbine pitch systems, heavy industrial equipment, and so on.
25° Angular contact ball bearing performance:
Radial load ★★☆☆☆
Axial load ★★★★★
Speed ★★☆☆☆
Angular contact ball bearings can be divided into single-row angular contact ball bearings, double-row angular contact ball bearings, and multi-row angular contact ball bearings according to the difference of the number of rows of rolling elements, and different rows design corresponds to the differentiation of the load carrying capacity and application scenarios.
Single-row angular contact ball bearings are the most common type, usually used to carry one-way axial load. As the most basic form of structure, single-row angular contact ball bearing consists of a group of steel balls, inner and outer rings, and cage composition, which can withstand a certain amount of axial load and small radial load.
Single-row angular contact ball bearing core features: Simple structure, flexible installation. Can only withstand single-direction axial load, reverse force needs to be paired use. High-speed performance and friction loss is small.
Single-row angular contact ball bearings are widely used in high-speed operation and occasions requiring high precision, such as electric tools, precision instruments, automobile wheel hubs and so on.
Double-row angular contact ball bearings have two rows of rolling bodies, compared with single-row angular contact ball bearings, its structure is more complex, the installation space requirements are larger, and the load-carrying capacity is stronger.
Double-row angular contact ball bearings core features: Bidirectional bearing: the contact angle is symmetrically distributed, and can simultaneously withstand bidirectional axial loads Rigidity enhancement: radial rigidity compared to single-row increases by 40-60% Adjustable preload: the bearing performance can be optimized by adjusting the preload.
Double-row angular contact ball bearings are suitable for applications that require large axial loads and are widely used in machine tool spindles, automotive wheel hubs, aerospace equipment and other fields.
Four-point contact angular contact ball bearings are a type of split bearing, which can also be described as a set of single-row angular contact ball bearings that can withstand bi-directional axial loads. Its design allows each rolling body (ball) and the inner and outer rings have four contact points, can withstand up to axial load of one of the radial load, and compared with double row bearings, four-point contact angular contact ball bearings take up the axial space is significantly reduced.
Four-point contact angular contact ball bearings core features: Separable structure, a single bearing can replace the front combination or back combination of angular contact ball bearings; Can withstand radial load, bi-directional axial load, can limit the axial displacement in both directions; Compared with other ball bearings, when the radial clearance is the same, the axial clearance is smaller and the limiting speed is higher; Higher radial load carrying capacity, Ssmaller space occupation.
Four-point contact angular contact ball bearings have strong axial load bearing capacity and better radial load bearing capacity, and have smaller space requirement capacity, especially suitable for high speed, high precision and high load environment, such as industrial robots, aerospace generators, machine tool spindles and so on.
According to the matching method, angular contact ball bearings can be divided into back-to-back (DB type angular contact ball bearings), face-to-face (DF type angular contact ball bearings), tandem (DT type angular contact ball bearings), and other angular contact ball bearings such as parallel connection and so on.
Two single-row angular contact ball bearing outer ring wide end face (back) relative mounting, “O” type arrangement, its contact angle line will be along the direction of the rotary axis of diffusion, the two angular contact ball bearing outer circle direction is opposite, and the bearing inner circle direction is also opposite.
Can well withstand two-way axial load force and certain anti-tilting moment performance; The span is large, with high rigidity and strong anti-deformation ability
Commonly used in scenes requiring high rigidity and anti-moment, such as machine tool spindles, gearboxes, rotary tables, and metallurgical equipment.
Two single-row angular contact ball bearings with outer ring narrow end face (front) relative mounting, “X” type arrangement, the contact angle line will converge in the direction of the rotary axis, because of its smaller angular rigidity, so can effectively increase the preload.
Smaller span, slightly less rigid than back-to-back pairing; Better adaptation to thermal expansion of the shaft (axial displacement allowed).
Suitable for applications where smaller axial loads need to be carried, where space is compact, and where preload is adjusted or axial expansion is compensated for. Such as automobile wheels, pumps, industrial robots, power tools, and high temperature or long shaft environments.
Two single-row angular contact ball bearings two bearings wide end toward the same direction configuration (tandem), “T” type arrangement, its contact angle line is in a parallel state, from the radial and axial load force can be bearing uniform sharing. They are usually mounted opposite each other at both ends of the machine to balance and limit axial stability.
Mainly withstand single axial load forces, load carrying capacity increases exponentially. Cannot withstand tilting moments, need to be used with other bearings.
Mainly used in the need to withstand one-way large axial force occasions, such as centrifugal pumps, fan spindles, high-speed motors, marine machinery and so on.
Angular contact ball bearings have other pairing methods such as triple pairing, quadruple pairing and so on, to cope with the extreme load, high rigidity or complex working conditions of the special configuration, the combination of flexible and diverse, according to the actual needs of the design.
According to the original material, angular contact ball bearings can be divided into bearing steel angular contact ball bearings, stainless steel angular contact ball bearings, ceramic angular contact ball bearings and so on.
Steel angular contact ball bearings are usually manufactured from high-carbon chrome-bearing steel materials (such as GCr15 or AISI 52100 steel, etc.) and are suitable for most conventional industrial applications. High-carbon chrome-bearing steel is processed into bearings through a heat treatment process (quenching + low-temperature tempering), which has high hardness, wear resistance, and high load-carrying capacity.
Low cost, mature manufacturing process, excellent comprehensive mechanical properties.
Easy to rust, poor corrosion resistance, high-temperature performance limitations (in the high-temperature environment performance degradation), high density (affects the centrifugal force at high speeds)
Stainless steel angular contact ball bearings are usually made of stainless steel (such as martensitic stainless steel AISI 440C or austenitic stainless steel AISI 304, AISI316, etc.), which has excellent corrosion resistance and good oxidation resistance, suitable for applications that require long-term exposure to moisture and chemicals. Generally speaking for the heat treatment process of stainless steel materials, martensitic stainless steel needs quenching + low-temperature tempering, and high hardness; austenitic stainless steel is non-magnetic but has lower hardness.
Strong rust resistance, high-temperature stability, some types are non-magnetic, applicable to the general harsh environment.
Higher cost, slightly lower load capacity (especially austenitic stainless steel).
Ceramic angular contact ball bearings are made of ceramic materials, such as silicon nitride (Si₃N₄) or zirconium oxide (ZrO₂), etc. They are suitable for high-speed, high-precision, and extreme environments (e.g., high temperature, low temperature, and chemically corrosive environments, etc.) applications.
Lightweight, low friction, high limiting speed, corrosion resistance, high-temperature resistance, abrasion resistance, rust resistance, electrical insulation, long lifespan, lubrication-free, etc.
High cost, brittle (poor impact load resistance), complex manufacturing process.
As one of the common bearings, angular contact ball bearings are widely used in various fields by virtue of their advantages, but they also have certain limitations. Understanding the advantages and disadvantages of angular contact ball bearings can help users carefully weigh performance, cost and maintenance, and better choose the right bearing.
Angular contact ball bearings can withstand radial load and axial load at the same time, especially the axial load performance is outstanding. Contact angle design (usually 15 ° ~ 40 °) significantly enhances the axial load-carrying capacity.
Due to the contact surface is small, rolling body friction is small, so the angular contact ball bearing can adapt to the needs of high-speed operation but needs to pay attention to lubrication and heat dissipation.
Multiple angular contact ball bearings have a flexible arrangement, can realize the effective support of reverse load. Such as back-to-back (DB), face-to-face (DF), or tandem (DT) arrangements, to adapt to different load directions and rigidity requirements.
Through the preload adjustment (axial preload) can improve the bearing stiffness and rotational accuracy, can be used in high-precision mechanical equipment, such as machine tool spindle, robot joints, power tools, etc.
Relatively simple design is easy to maintain, in good lubrication conditions, long life, commonly used in pumps, compressors and other industrial equipment.
Compared with deep groove ball bearings, angular contact ball bearings require higher manufacturing processes and materials, and the cost increases further when used in pairs, which may limit their application in low-cost equipment.
In the case of single-row angular contact ball bearings, can only withstand unidirectional axial load, and need to be installed in pairs (increase cost and complexity) to realize the bidirectional bearing, such as automobile wheel hub in the application.
Angular contact ball bearing preload adjustment needs professional technology, improper installation is easy to lead to overheating or wear, affecting its service life and performance.
Although angular contact ball bearings can withstand a certain radial load, but compared with deep groove ball bearings, its radial load carrying capacity is weaker and does not apply to heavy machinery pure radial high load scene.
Slight deformation or misalignment of the shaft or seat hole is easy to triggers stress concentration, leading to early failure and needs to be strictly aligned, such as wind turbine gearbox in the stringent requirements.
Angular contact ball bearings are widely used in mechanical systems requiring precise control, high speed operation or bi-directional forces due to their high speed capability, high rigidity and ability to withstand combined loads (radial + axial). Typical application areas and specific scenarios are listed below:
Machine tool spindle bearings require high precision, high speed and large axial load, while angular contact ball bearings can withstand the radial and axial cutting force under high speed rotation by pairing, and at the same time improve the rigidity through preload to ensure machining accuracy, widely used in lathes, milling machines, grinding machines and other spindle units.
4.2 Automobile industry
In automobile wheel hubs, transmissions, engines and other components, angular contact ball bearings are usually used to withstand large axial loads, especially in applications requiring precision movements and high speeds.
(1) Wheel hub bearings: mounted in pairs back-to-back (DB) to withstand radial loads on the wheels and bi-directional axial forces during cornering.
(2) Gearboxes: support high-speed gear shafts and withstand the axial thrust generated by gear meshing.
(3) Automobile engine machine: high-speed motor rotor support, high temperature resistance and low friction design.
Angular contact ball bearings can sustain high-precision, high-load operation and are therefore widely applied to aerospace equipment such as turbine engines, gas turbines/centrifugal compressors, and guidance systems.
Angular contact ball bearings can be used in industrial robot joints to provide high stiffness and precise motion control by tandem (DT) or back-to-back (DB) mounting, e.g., six-axis robotic wrist joint, which can withstand multi-directional moments.
Angular contact ball bearings in electric tools (e.g., electric drill and electric screwdriver), can provide stable support at high speed and sustain axial loads with the guarantee of low friction.
In the energy and heavy industry, angular contact ball bearings are widely used in wind turbine gearboxes, pumps, compressors and so on due to their structural characteristics and various arrangements.
Angular contact ball bearings provide low-friction and high-precision support in equipment requiring high-precision rotation, such as optical equipment (precision rotary table, rotating mirrors in a laser cutter), laser scanners, precision measuring equipment, etc.
Single-row angular contact ball bearings are the most common type of angular contact ball bearings. They consist of a single row of steel balls and inner and outer rings. They have a contact angle design (commonly 15°, 25°, 40°, etc.) and can only bear axial loads in one direction. They are often used in machine tool spindles, pump shafts, automation equipment, precision instruments and other fields that have high requirements for accuracy and high speed.
It is worth noting that when using angular contact ball bearings alone, the load direction must be strictly limited; the axial preload must be ensured during installation to avoid excessive internal clearance.
As there are too many types of angular contact ball bearings, here we at LNB Bearing will first list the size chart of single row angular contact ball bearings, and other types of angular contact ball bearings size chart will be continuously updated in the following blogs.
Model | Type | Inner Dimension (mm) | Outer Dimension (mm) | Width |
7000 | 7000C; 7000AC; 7000B | 10 | 26 | 8 |
7001 | 7001C; 7001AC; 7001B | 12 | 28 | 8 |
7002 | 7002C; 7002AC; 7002B | 15 | 32 | 9 |
7003 | 7003C; 7003AC; 7003B | 17 | 35 | 10 |
7004 | 7004C; 7004AC; 7004B | 20 | 42 | 12 |
7005 | 7005C; 7005AC; 7005B | 25 | 47 | 12 |
7006 | 7006C; 7006AC; 7006B | 30 | 55 | 13 |
7007 | 7007C; 7007AC; 7007B | 35 | 62 | 14 |
7008 | 7008C; 7008AC; 7008B | 40 | 68 | 15 |
7009 | 7009C; 7009AC; 7009B | 45 | 75 | 16 |
7010 | 7010C; 7010AC; 7010B | 50 | 80 | 16 |
7011 | 7011C; 7011AC; 7011B | 55 | 90 | 18 |
7012 | 7012C; 7012AC; 7012B | 60 | 95 | 18 |
7013 | 7013C; 7013AC; 7013B | 65 | 100 | 18 |
7014 | 7014C; 7014AC; 7014B | 70 | 110 | 20 |
7015 | 7015C; 7015AC; 7015B | 75 | 115 | 20 |
7016 | 7016C; 7016AC; 7016B | 80 | 125 | 22 |
7017 | 7017C; 7017AC; 7017B | 85 | 130 | 22 |
7018 | 7018C; 7018AC; 7018B | 90 | 140 | 24 |
7019 | 7019C; 7019AC; 7019B | 95 | 145 | 24 |
7020 | 7020C; 7020AC; 7020B | 100 | 150 | 24 |
7021 | 7021C; 7021AC; 7021B | 105 | 160 | 26 |
7022 | 7022C; 7022AC; 7022B | 110 | 170 | 28 |
7024 | 7024C; 7024AC; 7024B | 120 | 180 | 28 |
7026 | 7026C; 7026AC; 7026B | 130 | 200 | 33 |
7028 | 7028C; 7028AC; 7028B | 140 | 210 | 33 |
7030 | 7030C; 7030AC; 7030B | 150 | 225 | 35 |
7032 | 7032C; 7032AC; 7032B | 160 | 240 | 38 |
7034 | 7034C; 7034AC; 7034B | 170 | 260 | 42 |
7036 | 7036C; 7036AC; 7036B | 180 | 280 | 46 |
7038 | 7038C; 7038AC; 7038B | 190 | 290 | 46 |
7040 | 7040C; 7040AC; 7040B | 200 | 310 | 51 |
7044 | 7044C; 7044AC; 7044B | 220 | 340 | 56 |
Model | Type | Inner Dimension (mm) | Outer Dimension (mm) | Width |
7200 | 7200C; 7200AC; 7200B | 10 | 30 | 9 |
7201 | 7201C; 7201AC; 7201B | 12 | 32 | 10 |
7202 | 7202C; 7202AC; 7202B | 15 | 35 | 11 |
7203 | 7203C; 7203AC; 7203B | 17 | 40 | 12 |
7204 | 7204C; 7204AC; 7204B | 20 | 47 | 14 |
7205 | 7205C; 7205AC; 7205B | 25 | 52 | 15 |
7206 | 7206C; 7206AC; 7206B | 30 | 62 | 16 |
7207 | 7207C; 7207AC; 7207B | 35 | 72 | 17 |
7208 | 7208C; 7208AC; 7208B | 40 | 80 | 18 |
7209 | 7209C; 7209AC; 7209B | 45 | 85 | 19 |
7210 | 7210C; 7210AC; 7210B | 50 | 90 | 20 |
7211 | 7211C; 7211AC; 7211B | 55 | 100 | 21 |
7212 | 7212C; 7212AC; 7212B | 60 | 110 | 22 |
7213 | 7213C; 7213AC; 7213B | 65 | 120 | 23 |
7214 | 7214C; 7214AC; 7214B | 70 | 125 | 24 |
7215 | 7215C; 7215AC; 7215B | 75 | 130 | 25 |
7216 | 7216C; 7216AC; 7216B | 80 | 140 | 26 |
7217 | 7217C; 7217AC; 7217B | 85 | 150 | 28 |
7218 | 7218C; 7218AC; 7218B | 90 | 160 | 30 |
7219 | 7219C; 7219AC; 7219B | 95 | 170 | 32 |
7220 | 7220C; 7220AC; 7220B | 100 | 180 | 34 |
7221 | 7221C; 7221AC; 7221B | 105 | 190 | 36 |
7222 | 7222C; 7222AC; 7222B | 110 | 200 | 38 |
7224 | 7224C; 7224AC; 7224B | 120 | 215 | 40 |
7226 | 7226C; 7226AC; 7226B | 130 | 230 | 40 |
7228 | 7228C; 7228AC; 7228B | 140 | 250 | 42 |
7230 | 7230C; 7230AC; 7230B | 150 | 270 | 45 |
7232 | 7232C; 7232AC; 7232B | 160 | 290 | 48 |
7234 | 7234C; 7234AC; 7234B | 170 | 310 | 52 |
7236 | 7236C; 7236AC; 7236B | 180 | 320 | 52 |
7238 | 7238C; 7238AC; 7238B | 190 | 340 | 55 |
7240 | 7240C; 7240AC; 7240B | 200 | 360 | 58 |
7244 | 7244C; 7244AC; 7244B | 220 | 400 | 65 |
Model | Type | Inner Dimension (mm) | Outer Dimension (mm) | Width |
7300 | 7300C; 7300AC; 7300B | 10 | 35 | 11 |
7301 | 7301C; 7301AC; 7301B | 12 | 37 | 12 |
7302 | 7302C; 7302AC; 7302B | 15 | 42 | 13 |
7303 | 7303C; 7303AC; 7303B | 17 | 47 | 14 |
7304 | 7304C; 7304AC; 7304B | 20 | 52 | 15 |
7305 | 7305C; 7305AC; 7305B | 25 | 62 | 17 |
7306 | 7306C; 7306AC; 7306B | 30 | 72 | 19 |
7307 | 7307C; 7307AC; 7307B | 35 | 80 | 21 |
7308 | 7308C; 7308AC; 7308B | 40 | 90 | 23 |
7309 | 7309C; 7309AC; 7309B | 45 | 100 | 25 |
7310 | 7310C; 7310AC; 7310B | 50 | 110 | 27 |
7311 | 7311C; 7311AC; 7311B | 55 | 120 | 29 |
7312 | 7312C; 7312AC; 7312B | 60 | 130 | 31 |
7313 | 7313C; 7313AC; 7313B | 65 | 140 | 33 |
7314 | 7314C; 7314AC; 7314B | 70 | 150 | 35 |
7315 | 7315C; 7315AC; 7315B | 75 | 160 | 37 |
7316 | 7316C; 7316AC; 7316B | 80 | 170 | 39 |
7317 | 7317C; 7317AC; 7317B | 85 | 180 | 41 |
7318 | 7318C; 7318AC; 7318B | 90 | 190 | 43 |
7319 | 7319C; 7319AC; 7319B | 95 | 200 | 45 |
7320 | 7320C; 7320AC; 7320B | 100 | 215 | 47 |
7321 | 7321C; 7321AC; 7321B | 105 | 225 | 49 |
7322 | 7322C; 7322AC; 7322B | 110 | 240 | 50 |
7324 | 7324C; 7324AC; 7324B | 120 | 260 | 55 |
7326 | 7326C; 7326AC; 7326B | 130 | 280 | 58 |
7328 | 7328C; 7328AC; 7328B | 140 | 300 | 62 |
7330 | 7330C; 7330AC; 7330B | 150 | 320 | 65 |
7332 | 7332C; 7332AC; 7332B | 160 | 340 | 68 |
7334 | 7334C; 7334AC; 7334B | 170 | 360 | 72 |
7336 | 7336C; 7336AC; 7336B | 180 | 380 | 75 |
7338 | 7338C; 7338AC; 7338B | 190 | 400 | 78 |
7340 | 7340C; 7340AC; 7340B | 200 | 420 | 80 |
LNB bearings provide full-model, high-quality angular contact ball bearings with different precisions (P0-P6), different ABEC tolerances (1-9 grades), different clearances (C2-C4), different materials (steel, ceramic, stainless steel, etc.), different cages (J type, M type, etc.), and different seals (open, metal shield-ZZ; rubber seal-2RS).
