EZO Japanese Precision Bearing Range — Quick Reference
EZO is the trusted Japanese miniature + small-size precision ball bearing brand — manufactured by Sapporo Precision Co Ltd (also known as Kitanihon Seiki). Used in instruments + electronics + small motors + medical equipment + precision machinery where bearing accuracy + small size matter.
| EZO Bearing Type | Best For | Common Sizes |
|---|---|---|
| Miniature Ball Bearings (3-10mm Bore) | Instruments + electronics + small motors | 3 / 4 / 5 / 6 / 8 / 10 mm bore |
| Small Series Ball Bearings (10-30mm) | Small machinery + precision drives | 10 / 15 / 20 / 25 / 30 mm bore |
| Stainless Steel (S Series) | Marine + food + medical + corrosive | 440C stainless |
| Open (No Seal) | Where external lubrication accessible | — |
| 2ZZ (Metal Shielded) | General contamination protection | — |
| 2RS (Rubber Sealed) | Better contamination + moisture exclusion | — |
| ABEC Precision Class | ABEC-1 standard / ABEC-3 precision / ABEC-5 high precision | Higher = tighter tolerance |
| Chrome Steel Standard | 52100 bearing steel — workshop standard | Most common — economical |
Why EZO: Japanese precision manufacturing at consistent quality. Where small + precise + reliable matter (instruments + medical + electronics + scientific), EZO competes with NMB + NSK miniature bearings. Smaller volume than big bearing brands (SKF/NSK/NACHI) but stronger in miniature/precision niche. Brand: EZO. Companion: all bearings, ball bearings, deep groove bearings, deep groove guide.
EZO Bearings – Japanese Precision Ball Bearings | AIMS Industrial
EZO Bearings is a trusted Japanese brand of high-precision miniature and small-size ball bearings, manufactured by Sapporo Precision Co., Ltd. (also known as Kitanihon Seiki), founded in 1969.
Product Range
EZO offers a comprehensive range of precision bearings in both metric and inch sizes, with bore diameters from 0.06 mm to 90 mm, available in:
Deep-groove, flanged, ultra-thin-section, and large-format styles
Chrome steel and stainless-steel variants
Multiple seal types and lubrication options
Market Applications
EZO precision ball bearings are widely used across demanding industries where compact size, low noise, and high rotational accuracy are essential, including:
AC/DC motors and power tools
Robotics and encoders
Flow meters and pumps
Medical equipment and measuring devices
Office automation and electronics
Authorized Supplier
AIMS Industrial is an authorized supplier of EZO precision ball bearings, rubber seals, and metal seals — providing access to the full EZO product range for industrial and specialty applications.
Browse EZO ball bearings at AIMS Industrial alongside our Bearings, Power Transmission, and FYH Bearings collections.
Order online, Contact our team or request a quote.
People Also Ask — EZO
Q: What makes EZO bearings different from a big brand like SKF or NSK?
EZO is a Japanese precision manufacturer competing in a specific niche — miniature and small-size precision ball bearings for instruments, medical equipment, electronics and scientific applications — rather than the full general-industrial range SKF or NSK cover. EZO runs at smaller volume than the major bearing brands but is genuinely stronger in that miniature/precision segment, competing directly with NMB and NSK's own miniature ranges.
Q: What size range do EZO bearings cover?
EZO bearings span bore diameters from 0.06mm right up to 90mm in both metric and inch sizes. Within that, the miniature series covers 3-10mm bore for instruments, electronics and small motors, while the small series covers 10-30mm bore for small machinery and precision drives.
Q: What does the ABEC precision class actually mean for EZO bearings?
ABEC is the tolerance grading system — ABEC-1 is the standard grade, ABEC-3 is precision, and ABEC-5 is high precision. The higher the number, the tighter the manufacturing tolerance, so choose based on how much rotational accuracy and low noise your application actually needs.
Q: Where are EZO precision bearings actually used?
EZO bearings turn up wherever compact size, low noise and high rotational accuracy matter more than raw load capacity — AC/DC motors and power tools, robotics and encoders, flow meters and pumps, medical equipment and measuring devices, and office automation and electronics.
Q: Does AIMS stock EZO seals as well as EZO bearings?
Yes — AIMS is an authorised supplier of EZO precision ball bearings, rubber seals, and metal seals, giving access to the full EZO product range rather than just the bearings themselves.