Thin section bearings (also called slim or thin wall bearings) feature an ultra-thin cross-section relative to their bore diameter. They deliver exceptional performance where space and weight are critical — saving up to 60% in weight and space compared to standard bearings while maintaining high precision, low friction, and multi-load capacity (radial, axial, and moment loads).
These bearings power mission-critical applications in:
- Aerospace & defense (satellites, gimbal systems).
- Robotics & automation.
- Medical devices (surgical robots, CT scanners).
- Semiconductor equipment.
- Machine tools & optical instruments.
The global thin section bearing market continues to grow rapidly thanks to miniaturization trends and Industry 4.0. Choosing the right supplier matters — you need precision (often ABEC 5–9), customization options, reliable lead times, and certifications like ISO 9001 or AS9100.
Before this post, we want to introduce us ZMS is a professional thin section bearings supplier in China. If you want to buy alternative thin section bearings, please contact us.
Here are the Top 10 Thin Section Bearing Suppliers ranked by specialization and real-world industry standing:
Kaydon Bearings (SKF Group) – The Global Leader
Founded in 1941 and acquired by SKF in 2013, Kaydon Bearings is headquartered in Muskegon, Michigan, USA. It literally invented the modern thin-section standard with its famous Reali-Slim® (inch & metric) and Ultra-Slim® series. Bore sizes range from ¾” to 40″ (19 mm to over 1 m), with constant cross-sections as thin as 3/16″. You get hundreds of configurations: stainless steel, hybrids, Endurakote® corrosion-resistant plating, seals, and custom coatings.
Strengths: Largest catalog on the planet, unmatched design flexibility, and proven in the harshest environments (including Mars rovers).
Certifications: AS9100D, ISO 9001, cleanroom assembly.
Best for: Aerospace, defense, robotics, medical devices, semiconductor equipment, and optics.
Website: kaydonbearings.com or skf.com/thin-section-bearings
Silverthin Bearings (Mechatronics Corporation)
Based in Preston, Washington, USA, Silverthin is 100% American-made and part of the privately held Mechatronics Corp. It offers full inch and metric thin-section lines (A, C, X types) plus slewing rings, with bores up to 37″+.
Strengths: DFARS-compliant, ISO 9001:2015 certified, and incredibly flexible manufacturing — perfect lead times for prototypes to high-volume runs. Many engineers call it the best “Made in USA” alternative to Kaydon at competitive pricing. Best for: Robotics, aerospace, defense, and industrial machinery where domestic sourcing matters.
Website: silverthin.com
RBC Bearings Incorporated
Headquartered in Oxford, Connecticut, USA, RBC is a true aerospace/defense powerhouse. Its thin-section lineup covers Type A (angular contact), Type C (radial), and Type X (4-point contact) bearings, plus sealed and custom-engineered versions. After acquiring Industrial Tectonics Bearings (ITB), it dominates high-stiffness and vacuum-rated designs.
Strengths: Exceptional combined-load capability and full custom engineering support.
Certifications: AS9100 and major OEM approvals.
Best for: Defense, aerospace, semiconductor manufacturing, and high-reliability robotics.
Website: rbcbearings.com
Schaeffler Group (INA / FAG)
Headquartered in Herzogenaurach, Germany, Schaeffler is one of the world’s largest bearing groups. Its INA-brand thin-section ball bearings come in deep-groove, angular-contact, and four-point contact designs.
Strengths: Superior load capacity, extremely low noise/vibration, and a massive global manufacturing & distribution network.
Best for: Robotics, medical equipment, automotive automation, and precision machinery (especially strong in Europe and Asia).
Website: schaeffler.com (search “INA thin section bearings”)
NSK Ltd.
Founded in 1916 and headquartered in Tokyo, Japan, NSK is the precision king with its N Series and NB7 ultra-thin metric ball bearings.
Strengths: Ultra-low frictional torque, smooth rotation, and Japanese-level running accuracy — ideal for high-speed and miniaturization.
Best for: Semiconductor equipment, industrial robots, medical imaging, machine tools, and office automation.
Website: nsk.com
The Timken Company
Headquartered in North Canton, Ohio, USA (founded 1899), Timken offers precision thin-section deep-groove and angular-contact bearings in stainless or chrome steel, with superfinished raceways.
Strengths: ABEC 5/7 precision, ultra-low friction/vibration, and one of the strongest global supply chains in the industry.
Best for: Medical devices, aerospace, industrial machinery, and robotics.
Website: timken.com
New Hampshire Ball Bearings (NHBB – MinebeaMitsumi)
Based in Peterborough, New Hampshire, USA (subsidiary of Japanese MinebeaMitsumi), NHBB specializes in flight-critical thin-section and torque-tube bearings up to 10″ bore.
Strengths: Hybrid ceramic options, exotic materials (Inconel, Stellite), and extreme-environment expertise.
Certifications: AS9100.
Best for: Aerospace, defense, space applications, and high-end medical devices.
Website: nhbb.com
NTN Corporation
Headquartered in Osaka, Japan, NTN’s Ultra-Thin Section ball bearings (radial, 4-point, angular contact) come with optional seals and focus on extreme compactness.
Strengths: Rock-solid Japanese quality control and excellent cost-performance balance.
Best for: Robotics, automation, medical devices, and general precision machinery.
Website: ntnamericas.com or ntnglobal.com
Koyo Bearings (JTEKT Corporation)
Headquarters: Osaka, Japan (JTEKT global HQ) Koyo, under JTEKT, offers the dedicated K-series super thin section ball bearings in three main types: deep groove (C), angular contact (A), and four-point contact (X). These are open or sealed designs with constant cross-sections starting from very thin (e.g., 4.762 mm / 3/16″) up to larger sections (e.g., 25.4 mm). Bore sizes range widely — from small (around 25 mm) to large (over 300 mm / 12″+), with examples like KTC010, KCA120, KAX035, KUC045 2RD (sealed), and bigger ones like KFX180.
Strengths: High Japanese precision engineering, low torque/smooth rotation, reliable load ratings, and good availability in automation/robotics markets.
They provide excellent cost-performance compared to ultra-premium US brands, plus options for special environments (e.g., cleanroom-compatible). Catalogs confirm full technical support, tolerances (up to high classes like K4/K6), and mounting details.
Certifications: ISO standards, aerospace-capable in some lines (JTEKT has aerospace qualifications).
Best for: Industrial robots, automation equipment, precision machinery, semiconductor tools, and general high-accuracy applications where Japanese quality and competitive pricing matter. Strong in Asia-Pacific and global OEM supply chains.
Website: koyo.jtekt.co.jp (search “K-series super thin section ball bearings”) or jtekt-na.com for North America.
LYC Bearing Corporation
Headquarters: Luoyang, Henan Province, China LYC Bearing Corporation, established in 1954, is one of China’s premier comprehensive bearing manufacturers with over 70 years of experience. Their thin section bearings (also called thin-wall or slim bearings) feature thin rings and small constant cross-sections, delivering lightweight construction, low friction, high rigidity, and excellent rotational accuracy. Available types include:
- Open thin section bearings.
- Deep groove, four-point contact, and angular contact configurations.
They emphasize compact, lightweight designs suitable for high-rigidity/large-aperture needs, with applications in aircraft, aerospace, medical equipment, radar communications, astronomical instruments, textile printers, industrial robotics, and more. LYC’s overall capabilities are impressive: precision up to P2, sizes from tiny (8 mm ID) to enormous (OD up to 13.5 meters), and production across 25 factories with annual output exceeding 120 million units. While their thin-section line isn’t as catalog-dominant as Kaydon’s Reali-Slim, it’s a legitimate, high-quality offering backed by strong engineering (1000+ engineers) and certifications (ISO 9001, AS9100 in relevant lines, etc.).
Strengths: Exceptional value for money, massive scale for custom/large-volume orders, proven in demanding Chinese domestic sectors (e.g., aerospace, rail, energy), and growing international presence. Ideal for cost-sensitive projects without sacrificing precision.
Certifications: ISO 9001, IATF 16949, AS9100 (aerospace-capable), and others.
Best for: Aerospace, medical devices, robotics, industrial automation, radar/astronomy, and OEMs seeking reliable Chinese-sourced thin section bearings with customization potential.
Website: lyc-bearing.com (see Products → Thin Section Bearings) or lycbearing.com for North America details.
Want to know thin section manufacturers in China with price competitive while also keep high quality? There are normal thin section ball bearings 67&68&69 series and also ultra thin section bearings manufacturers. Still if you want to buy ceramic or stainless thin section bearings used for fitness or bikes, please feel free to contact ZMS.
