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Thin Section Bearings

Thin section bearings, also known as constant cross-section ball bearings, are designed with a constant cross-section. Their cross-sectional height and width remain the same regardless of the shaft diameter. They typically consist of an inner ring, outer ring, balls, cage, and optional seals or shields. These bearings are specifically designed for applications where installation space and weight are limited.

As a precision thin section bearing manufacturer, BKZ Industry uses high-quality materials such as SAE 52100 bearing steel, 440C stainless steel, silicon nitride ceramic balls for hybrid bearings, high nitrogen corrosion-resistant steel (Cronidur), aluminum, and special alloys for lightweight aerospace applications. We manufacture radial contact, angular contact, and four-point contact thin section bearings for various precision applications.

These bearings are widely used in aerospace equipment, robotics, medical devices, machine tools, semiconductor equipment, and other high-precision machinery.

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Thin Sectio Bearings Als Known As Constant Cross Section Ball Bearings

Features and Benefits of Thin Section Bearings

Why choose thin section bearings? Understanding their features and benefits helps engineers design more compact, lightweight, and high-precision equipment.

Features of Thin Section Bearings

Constant Cross-Section Design

Thin section bearings maintain the same cross-section regardless of bore diameter, allowing larger shaft diameters in limited installation space while keeping the bearing lightweight and compact for equipment design.

Thin Inner and Outer Rings Design

The thin inner and outer rings reduce material usage and bearing weight while maintaining rigidity when supported by proper housing and shaft structures.

Available in Different Designs

Thin section bearings are available in radial contact, angular contact, and four-point contact designs, allowing them to support radial loads, axial loads, or combined loads depending on application requirements.

Flexible Load Support

Thin section bearings can support radial loads, axial loads, and moment loads depending on the bearing design, making them suitable for complex load conditions and compact mechanical systems.

Little Running Noise

With small rolling elements and precision manufacturing, thin section bearings can operate with low running noise, making them suitable for applications where smooth and quiet performance is important.

Benefits of Thin Section Bearings

Space Saving

The thin cross-section allows equipment designers to reduce housing size and overall machine dimensions, which is especially important for compact equipment such as robotics, medical devices, and aerospace systems.

Weight Reduction

Thin section bearings use less material than standard bearings, significantly reducing overall equipment weight, which is critical for aerospace equipment, robots, and moving mechanical systems.

High Precision and Stiffness

Despite their thin rings, these bearings can maintain high rotational accuracy and system stiffness when properly mounted, making them suitable for precision positioning and rotation systems.

Reduce Friction and Improve Efficiency

Ball contact rolling reduces friction compared with sliding components, improving mechanical efficiency, reducing heat generation, and helping extend equipment service life.

Used in High-Precision Applications

Thin section bearings are ideal for applications where space, weight, and precision are critical, such as aerospace equipment, robotics, medical devices, and semiconductor machinery.

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Thin Section Bearing Types

Thin section bearings are typically classified into three main types based on contact design: radial contact, angular contact, and four-point contact bearings.

Thin Section Deep Groove Ball Bearings

Thin Section Deep Groove Ball Bearings

Thin section radial contact Bearings (C Series) use deep raceway grooves and ball rolling elements, mainly designed to support radial loads with limited axial loads. They provide low friction, smooth rotation, and high-speed performance. C series bearings are commonly used in automation equipment, conveyors, packaging machines, and light rotating systems where space is limited.

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Thin Section Angular Contact Bearings

Thin Section Angular Contact Bearings

Thin section angular contact bearings (A series) are designed with a contact angle to support combined radial and axial loads. They provide higher axial load capacity and better positioning accuracy than deep groove designs. A series bearings are widely used in robotics, machine tools, medical equipment, and precision positioning systems.

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Thin Section Four Point Contact Bearings

Thin Section Four-Point Contact Bearings

Thin section four-point contact bearings (X series) use a four-point contact raceway design that allows a single bearing to support radial loads, axial loads in both directions, and moment loads. This design can replace two angular contact bearings in some applications. X series bearings are commonly used in robotics arms, rotary tables, radar systems, and aerospace equipment.

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*Ultra-thin section bearings and customized thin section bearings are also available based on your application requirements.  Contact us for more options.

Thin Section Bearing Size Chart

Thin section bearings do not follow standard ISO dimension series and their dimensions differ from conventional bearings. If you have thin section bearing requirements, please contact us for technical support and bearing selection. For reference, we also list some thin section bearing sizes based on projects we have worked on with customers.

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Bearing No Series Bearing Type Bore Diameter d (mm) Outside Diameter D (mm) Width B (mm) Dynamic Load Rating C (kN) Static Load Rating C0 (kN) Limiting Speed (rpm) Weight (kg)
KC020 C Thin Section Deep Groove 20 45 6 5 7.5 15000 0.05
KC021 C Thin Section Deep Groove 21 46 6 5.3 7.95 14980 0.06
KC022 C Thin Section Deep Groove 22 47 6 5.6 8.4 14960 0.07
KC023 C Thin Section Deep Groove 23 48 6 5.9 8.85 14940 0.08
KC024 C Thin Section Deep Groove 24 49 6 6.2 9.3 14920 0.09
KC025 C Thin Section Deep Groove 25 50 6 6.5 9.75 14900 0.1
KC026 C Thin Section Deep Groove 26 51 6 6.8 10.2 14880 0.11
KC027 C Thin Section Deep Groove 27 52 6 7.1 10.65 14860 0.12
KC028 C Thin Section Deep Groove 28 53 6 7.4 11.1 14840 0.13
KC029 C Thin Section Deep Groove 29 54 6 7.7 11.55 14820 0.14
KC030 C Thin Section Deep Groove 30 55 6 8 12 14800 0.15
KC031 C Thin Section Deep Groove 31 56 6 8.3 12.45 14780 0.16
KC032 C Thin Section Deep Groove 32 57 6 8.6 12.9 14760 0.17
KC033 C Thin Section Deep Groove 33 58 6 8.9 13.35 14740 0.18
KC034 C Thin Section Deep Groove 34 59 6 9.2 13.8 14720 0.19
KC035 C Thin Section Deep Groove 35 60 6 9.5 14.25 14700 0.2
KC036 C Thin Section Deep Groove 36 61 6 9.8 14.7 14680 0.21
KC037 C Thin Section Deep Groove 37 62 6 10.1 15.15 14660 0.22
KC038 C Thin Section Deep Groove 38 63 6 10.4 15.6 14640 0.23
KC039 C Thin Section Deep Groove 39 64 6 10.7 16.05 14620 0.24
KC040 C Thin Section Deep Groove 40 65 6 11 16.5 14600 0.25
KC041 C Thin Section Deep Groove 41 66 6 11.3 16.95 14580 0.26
KC042 C Thin Section Deep Groove 42 67 6 11.6 17.4 14560 0.27
KC043 C Thin Section Deep Groove 43 68 6 11.9 17.85 14540 0.28
KC044 C Thin Section Deep Groove 44 69 6 12.2 18.3 14520 0.29
KC045 C Thin Section Deep Groove 45 70 6 12.5 18.75 14500 0.3
KC046 C Thin Section Deep Groove 46 71 6 12.8 19.2 14480 0.31
KC047 C Thin Section Deep Groove 47 72 6 13.1 19.65 14460 0.32
KC048 C Thin Section Deep Groove 48 73 6 13.4 20.1 14440 0.33
KC049 C Thin Section Deep Groove 49 74 6 13.7 20.55 14420 0.34
KC050 C Thin Section Deep Groove 50 75 6 14 21 14400 0.35
KC051 C Thin Section Deep Groove 51 76 6 14.3 21.45 14380 0.36
KC052 C Thin Section Deep Groove 52 77 6 14.6 21.9 14360 0.37
KC053 C Thin Section Deep Groove 53 78 6 14.9 22.35 14340 0.38
KC054 C Thin Section Deep Groove 54 79 6 15.2 22.8 14320 0.39
KC055 C Thin Section Deep Groove 55 80 6 15.5 23.25 14300 0.4
KC056 C Thin Section Deep Groove 56 81 6 15.8 23.7 14280 0.41
KC057 C Thin Section Deep Groove 57 82 6 16.1 24.15 14260 0.42
KC058 C Thin Section Deep Groove 58 83 6 16.4 24.6 14240 0.43
KC059 C Thin Section Deep Groove 59 84 6 16.7 25.05 14220 0.44
KC060 C Thin Section Deep Groove 60 85 6 17 25.5 14200 0.45
KC061 C Thin Section Deep Groove 61 86 6 17.3 25.95 14180 0.46
KC062 C Thin Section Deep Groove 62 87 6 17.6 26.4 14160 0.47
KC063 C Thin Section Deep Groove 63 88 6 17.9 26.85 14140 0.48
KC064 C Thin Section Deep Groove 64 89 6 18.2 27.3 14120 0.49
KC065 C Thin Section Deep Groove 65 90 6 18.5 27.75 14100 0.5
KC066 C Thin Section Deep Groove 66 91 6 18.8 28.2 14080 0.51
KC067 C Thin Section Deep Groove 67 92 6 19.1 28.65 14060 0.52
KC068 C Thin Section Deep Groove 68 93 6 19.4 29.1 14040 0.53
KC069 C Thin Section Deep Groove 69 94 6 19.7 29.55 14020 0.54
KA020 A Thin Section Angular Contact 20 45 6 5 7.5 15000 0.05
KA021 A Thin Section Angular Contact 21 46 6 5.3 7.95 14980 0.06
KA022 A Thin Section Angular Contact 22 47 6 5.6 8.4 14960 0.07
KA023 A Thin Section Angular Contact 23 48 6 5.9 8.85 14940 0.08
KA024 A Thin Section Angular Contact 24 49 6 6.2 9.3 14920 0.09
KA025 A Thin Section Angular Contact 25 50 6 6.5 9.75 14900 0.1
KA026 A Thin Section Angular Contact 26 51 6 6.8 10.2 14880 0.11
KA027 A Thin Section Angular Contact 27 52 6 7.1 10.65 14860 0.12
KA028 A Thin Section Angular Contact 28 53 6 7.4 11.1 14840 0.13
KA029 A Thin Section Angular Contact 29 54 6 7.7 11.55 14820 0.14
KA030 A Thin Section Angular Contact 30 55 6 8 12 14800 0.15
KA031 A Thin Section Angular Contact 31 56 6 8.3 12.45 14780 0.16
KA032 A Thin Section Angular Contact 32 57 6 8.6 12.9 14760 0.17
KA033 A Thin Section Angular Contact 33 58 6 8.9 13.35 14740 0.18
KA034 A Thin Section Angular Contact 34 59 6 9.2 13.8 14720 0.19
KA035 A Thin Section Angular Contact 35 60 6 9.5 14.25 14700 0.2
KA036 A Thin Section Angular Contact 36 61 6 9.8 14.7 14680 0.21
KA037 A Thin Section Angular Contact 37 62 6 10.1 15.15 14660 0.22
KA038 A Thin Section Angular Contact 38 63 6 10.4 15.6 14640 0.23
KA039 A Thin Section Angular Contact 39 64 6 10.7 16.05 14620 0.24
KA040 A Thin Section Angular Contact 40 65 6 11 16.5 14600 0.25
KA041 A Thin Section Angular Contact 41 66 6 11.3 16.95 14580 0.26
KA042 A Thin Section Angular Contact 42 67 6 11.6 17.4 14560 0.27
KA043 A Thin Section Angular Contact 43 68 6 11.9 17.85 14540 0.28
KA044 A Thin Section Angular Contact 44 69 6 12.2 18.3 14520 0.29
KA045 A Thin Section Angular Contact 45 70 6 12.5 18.75 14500 0.3
KA046 A Thin Section Angular Contact 46 71 6 12.8 19.2 14480 0.31
KA047 A Thin Section Angular Contact 47 72 6 13.1 19.65 14460 0.32
KA048 A Thin Section Angular Contact 48 73 6 13.4 20.1 14440 0.33
KA049 A Thin Section Angular Contact 49 74 6 13.7 20.55 14420 0.34
KA050 A Thin Section Angular Contact 50 75 6 14 21 14400 0.35
KA051 A Thin Section Angular Contact 51 76 6 14.3 21.45 14380 0.36
KA052 A Thin Section Angular Contact 52 77 6 14.6 21.9 14360 0.37
KA053 A Thin Section Angular Contact 53 78 6 14.9 22.35 14340 0.38
KA054 A Thin Section Angular Contact 54 79 6 15.2 22.8 14320 0.39
KA055 A Thin Section Angular Contact 55 80 6 15.5 23.25 14300 0.4
KA056 A Thin Section Angular Contact 56 81 6 15.8 23.7 14280 0.41
KA057 A Thin Section Angular Contact 57 82 6 16.1 24.15 14260 0.42
KA058 A Thin Section Angular Contact 58 83 6 16.4 24.6 14240 0.43
KA059 A Thin Section Angular Contact 59 84 6 16.7 25.05 14220 0.44
KA060 A Thin Section Angular Contact 60 85 6 17 25.5 14200 0.45
KA061 A Thin Section Angular Contact 61 86 6 17.3 25.95 14180 0.46
KA062 A Thin Section Angular Contact 62 87 6 17.6 26.4 14160 0.47
KA063 A Thin Section Angular Contact 63 88 6 17.9 26.85 14140 0.48
KA064 A Thin Section Angular Contact 64 89 6 18.2 27.3 14120 0.49
KA065 A Thin Section Angular Contact 65 90 6 18.5 27.75 14100 0.5
KA066 A Thin Section Angular Contact 66 91 6 18.8 28.2 14080 0.51
KA067 A Thin Section Angular Contact 67 92 6 19.1 28.65 14060 0.52
KA068 A Thin Section Angular Contact 68 93 6 19.4 29.1 14040 0.53
KA069 A Thin Section Angular Contact 69 94 6 19.7 29.55 14020 0.54
KX020 X Thin Section Four-Point Contact 20 45 6 5 7.5 15000 0.05
KX021 X Thin Section Four-Point Contact 21 46 6 5.3 7.95 14980 0.06
KX022 X Thin Section Four-Point Contact 22 47 6 5.6 8.4 14960 0.07
KX023 X Thin Section Four-Point Contact 23 48 6 5.9 8.85 14940 0.08
KX024 X Thin Section Four-Point Contact 24 49 6 6.2 9.3 14920 0.09
KX025 X Thin Section Four-Point Contact 25 50 6 6.5 9.75 14900 0.1
KX026 X Thin Section Four-Point Contact 26 51 6 6.8 10.2 14880 0.11
KX027 X Thin Section Four-Point Contact 27 52 6 7.1 10.65 14860 0.12
KX028 X Thin Section Four-Point Contact 28 53 6 7.4 11.1 14840 0.13
KX029 X Thin Section Four-Point Contact 29 54 6 7.7 11.55 14820 0.14
KX030 X Thin Section Four-Point Contact 30 55 6 8 12 14800 0.15
KX031 X Thin Section Four-Point Contact 31 56 6 8.3 12.45 14780 0.16
KX032 X Thin Section Four-Point Contact 32 57 6 8.6 12.9 14760 0.17
KX033 X Thin Section Four-Point Contact 33 58 6 8.9 13.35 14740 0.18
KX034 X Thin Section Four-Point Contact 34 59 6 9.2 13.8 14720 0.19
KX035 X Thin Section Four-Point Contact 35 60 6 9.5 14.25 14700 0.2
KX036 X Thin Section Four-Point Contact 36 61 6 9.8 14.7 14680 0.21
KX037 X Thin Section Four-Point Contact 37 62 6 10.1 15.15 14660 0.22
KX038 X Thin Section Four-Point Contact 38 63 6 10.4 15.6 14640 0.23
KX039 X Thin Section Four-Point Contact 39 64 6 10.7 16.05 14620 0.24
KX040 X Thin Section Four-Point Contact 40 65 6 11 16.5 14600 0.25
KX041 X Thin Section Four-Point Contact 41 66 6 11.3 16.95 14580 0.26
KX042 X Thin Section Four-Point Contact 42 67 6 11.6 17.4 14560 0.27
KX043 X Thin Section Four-Point Contact 43 68 6 11.9 17.85 14540 0.28
KX044 X Thin Section Four-Point Contact 44 69 6 12.2 18.3 14520 0.29
KX045 X Thin Section Four-Point Contact 45 70 6 12.5 18.75 14500 0.3
KX046 X Thin Section Four-Point Contact 46 71 6 12.8 19.2 14480 0.31
KX047 X Thin Section Four-Point Contact 47 72 6 13.1 19.65 14460 0.32
KX048 X Thin Section Four-Point Contact 48 73 6 13.4 20.1 14440 0.33
KX049 X Thin Section Four-Point Contact 49 74 6 13.7 20.55 14420 0.34
KX050 X Thin Section Four-Point Contact 50 75 6 14 21 14400 0.35
KX051 X Thin Section Four-Point Contact 51 76 6 14.3 21.45 14380 0.36
KX052 X Thin Section Four-Point Contact 52 77 6 14.6 21.9 14360 0.37
KX053 X Thin Section Four-Point Contact 53 78 6 14.9 22.35 14340 0.38
KX054 X Thin Section Four-Point Contact 54 79 6 15.2 22.8 14320 0.39
KX055 X Thin Section Four-Point Contact 55 80 6 15.5 23.25 14300 0.4
KX056 X Thin Section Four-Point Contact 56 81 6 15.8 23.7 14280 0.41
KX057 X Thin Section Four-Point Contact 57 82 6 16.1 24.15 14260 0.42
KX058 X Thin Section Four-Point Contact 58 83 6 16.4 24.6 14240 0.43
KX059 X Thin Section Four-Point Contact 59 84 6 16.7 25.05 14220 0.44
KX060 X Thin Section Four-Point Contact 60 85 6 17 25.5 14200 0.45
KX061 X Thin Section Four-Point Contact 61 86 6 17.3 25.95 14180 0.46
KX062 X Thin Section Four-Point Contact 62 87 6 17.6 26.4 14160 0.47
KX063 X Thin Section Four-Point Contact 63 88 6 17.9 26.85 14140 0.48
KX064 X Thin Section Four-Point Contact 64 89 6 18.2 27.3 14120 0.49
KX065 X Thin Section Four-Point Contact 65 90 6 18.5 27.75 14100 0.5
KX066 X Thin Section Four-Point Contact 66 91 6 18.8 28.2 14080 0.51
KX067 X Thin Section Four-Point Contact 67 92 6 19.1 28.65 14060 0.52
KX068 X Thin Section Four-Point Contact 68 93 6 19.4 29.1 14040 0.53
KX069 X Thin Section Four-Point Contact 69 94 6 19.7 29.55 14020 0.54

Thin Section Bearing Applications

Thanks to their compact cross-section, lightweight design, and high positioning accuracy, thin section bearings are commonly used in precision equipment and space-limited applications such as robotics, aerospace systems, medical equipment, semiconductor manufacturing machines, and automation systems.

FAQs About Thin Section Bearings

Q1. Can BKZ Industry Custom Thin Section Ball Bearings?

Yes. BKZ Industry can customize thin section ball bearings. Please contact us with your bearing dimensions such as inner diameter, outer diameter, bearing width, cross-section size, and space limitations if any. Also provide bearing type (radial contact, angular contact, or four-point contact), sealed or open design, load requirements, speed requirements, accuracy, clearance, material requirements, and working environment such as temperature range, vacuum conditions, dust, etc.

Yes. BKZ Industry is a bearing manufacturer that provides OEM services for thin section bearings. In addition to customizing bearing dimensions, structure, materials, cage, clearance, and seals, we can also add your logo on the bearings and packaging. Please contact us for more details.

Thin section bearings are most commonly ball bearings, but some customers also ask about thin section tapered roller bearings. The answer is yes, but these are special designs developed for space-saving and weight-reduction applications, and they are less common than thin section ball bearings.

Yes. BKZ Industry is a Chinese manufacturer of Type X, Type A, and Type C thin section bearings. We have two factories and can manufacture all types of thin section bearings according to your requirements. Please contact us for more information.

Yes. Ultra-thin section bearings are very low-profile ball bearings with extremely small cross-section thickness. Compared with standard thin section bearings, they are smaller, thinner, and lighter, and are typically used for lighter load applications where space and weight are critical.

SR series thin section bearings are a type of ultra-thin section ball bearings. Their main characteristics include ultra-thin cross-section, very small size, lightweight design, high space-saving capability, and lower stiffness compared with standard thin section bearings. They are typically used in small robots, camera gimbals, optical equipment, and compact precision devices.

Shielded thin section bearings are thin section ball bearings with metal shields on one or both sides to protect against dust and contamination while maintaining low friction and high-speed performance. They are commonly used in robotics, semiconductor equipment, medical devices, rotary tables, and precision automation equipment where a compact structure and clean operating conditions are required.

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Our Bearing Product Range

In addition to thin section bearings, we also supply a wide range of standard bearings, special bearings, and customized bearing solutions for different applications and operating conditions.

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Please provide dimensions, drawings, or application details for thin section bearings. Our engineering team will assist with bearing selection and provide technical support according to your operating conditions, load requirements, and working environment.

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Complete the form below for a quote, or contact us at sales@bkzindustry.com or +86 18901426056 (WhatsApp/phone).