01
Deep groove ball bearings
The all-rounder for radial and moderate axial loads.
- Bore
- 10–150 mm
- Series
- 60 · 62 · 63 · 618
- Raceway roundness on P4 spindle bearings
- Of bearings noise and vibration tested before packing
- To your quote, from a named application engineer
- Countries supplied from our Ohio plant
01Product families
Six bearing families. One standard of precision.
Popular sizes ship from stock within 48 hours. Anything else, we make to your drawing.
02
Angular contact ball bearings
Combined loads, high rigidity and precise shaft location.
- Bore
- 10–120 mm
- Series
- 70 · 72 · 73
03
Miniature and instrument bearings
Precision under 10 mm bore, where space is measured in millimetres.
- Bore
- 1–9 mm
- Series
- 68 · 69 · 62 · MR
04
Thrust ball bearings
Pure axial loads, carried cleanly in one direction.
- Bore
- 10–100 mm
- Series
- 511 · 512
05
Hybrid ceramic bearings
Silicon nitride balls for speed, insulation and long life.
- Bore
- 8–80 mm
- Series
- HC 60 · HC 62 · HC 70
06
Stainless steel bearings
Corrosion resistance for washdown, marine and food lines.
- Bore
- 3–50 mm
- Series
- S60 · S62 · S6 miniature
02Industries
Built into machines that are not allowed to stop.
Our engineers work with OEMs in six core markets, so the bearing arrives already matched to its load, speed and environment.
Electric motors and EV
Hybrid ceramic bearings that block stray shaft currents in inverter-fed and traction motors, plus C3 deep groove bearings for hot-running housings.
Hybrid ceramic · Deep groove
Machine tools
Matched P4 angular contact sets with factory-set preload for spindles where runout is measured in microns.
Angular contact · Hybrid ceramic
Robotics and automation
Low-torque, low-noise bearings for joints, grippers, linear axes and the servo motors that drive them.
Miniature · Deep groove
Medical and dental
Cleanroom-assembled miniatures for handpieces, infusion pumps and imaging, with lubricant fills controlled to the milligram.
Miniature · Stainless steel
Food and beverage
Stainless bearings with food-grade grease and FDA-compliant seals that survive high-pressure washdown every shift.
Stainless steel · Deep groove
Pumps and compressors
Angular contact pairs that carry heavy axial thrust, and sealed deep groove bearings for long service intervals.
Angular contact · Thrust
03How we work
From your drawing to a verified batch.
One engineer owns your project from the first question to the last shipment. No hand-offs, no guesswork.
- 01
Specify
Send a part number, a competitor reference or your drawing, with the load, speed, temperature and environment the bearing will see.
- 02
Engineer
A named application engineer checks rating life, fits, clearance and lubrication, then recommends the bearing that suits your duty.
- 03
Manufacture
Rings are turned, heat treated, ground and superfinished in-house. Assembly and greasing happen in a controlled environment.
- 04
Verify and ship
Every bearing is noise and vibration tested, and every batch ships with a dimensional report and an EN 10204 3.1 material certificate.
04Quality
Measured, not assumed.
Precision only counts when you can prove it. Every Rotara bearing passes through metrology, noise testing and documentation before it leaves the building.
- ISO 9001:2015
- IATF 16949:2016
- ISO 14001:2015
- Raceway roundness
- µmMeasured on every P4 batch
- Ring hardness
- HRCThrough-hardened 100Cr6 steel
- Cleanroom
- ISOFor miniature bearing assembly
- Production approval
- PPAPFor automotive programs
Every batch ships with its paperwork.
Your incoming inspection should be a formality. That is why each delivery carries the evidence behind it.
- Dimensional inspection report
- EN 10204 3.1 material certificate
- Hardness and heat treatment records
- Noise and vibration test results
- Lot traceability back to the steel heat
Vibration test report
6204-2RS · Lot 26-1187
- Low band50–300 Hz42 / limit 100 µm/s
- Medium band300–1,800 Hz31 / limit 80 µm/s
- High band1,800–10,000 Hz18 / limit 60 µm/s
05Company
Independent since 1987. Still obsessed with the last micron.
Rotara started as a six-person grinding shop in Columbus, Ohio, regrinding races for local motor rebuilders. Our founder believed a bearing is only as good as the last micron on its raceway, and that belief still sets the pace on our shop floor.
Today we turn, heat treat, grind, superfinish, assemble and test every bearing under one roof. We are still independent, which means the engineer who answers your first email is the one who signs off your first batch.
- Founded in Columbus, Ohio, as a six-person grinding shop
- People, a third of them engineers and inspectors
- Grinding and superfinishing lines
- Of manufacturing under one roof
06FAQ
Questions buyers ask us first.
Lead times, minimums, paperwork and replacements for the brand you use today.
Can you replace the bearings we buy from a major brand today?
Yes. Our standard bearings follow ISO 15 boundary dimensions and common suffix conventions. Send us the part number you use and we will confirm the Rotara equivalent, including internal clearance, seal type and grease.
What is your minimum order quantity?
There is no minimum for stocked sizes. Custom bearings usually start at 500 pieces, and we make prototype runs of 10 to 50 pieces for validation testing.
How long are your lead times?
Stocked sizes ship within 48 hours. Standard sizes that are not in stock take three to five weeks. Custom designs take six to ten weeks from an approved drawing, including first article inspection.
Can you make a bearing to our own drawing?
Yes. We make special bores and widths, flanged and extended inner rings, special clearances and preloads, and custom lubricant fills. Send us a drawing, or a sketch with the key dimensions and the duty.
Which certificates and reports come with an order?
Every batch ships with a dimensional inspection report and an EN 10204 3.1 material certificate. PPAP up to level 3, first article inspection reports and customer-specific test plans are available on request.
Which precision classes do you offer?
From ISO P0 (ABEC 1) for general machinery up to P4 (ABEC 7) for machine tool spindles. P2 (ABEC 9) is available on request for selected angular contact sizes.
Send us a part number, a drawing or a problem.
A named application engineer replies within one business day with a price, a lead time and a recommendation.