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Metric Size Standard Miniature Ball Bearings MR85

Metric Size Standard Miniature Ball Bearings MR85

The MR85 is a compact miniature ball bearing with a 5mm bore and 8mm outer diameter, measuring just 2mm wide. Made from chrome steel, it’s lightweight at 0.25g yet handles radial loads up to 59 lbf.

Its open design and ABEC1 tolerance ensure smooth rotation at speeds up to 53,000 RPM, ideal for precision applications. The stainless steel cage adds durability while keeping maintenance simple.

With a radial clearance of 0.002mm to 0.013mm, it offers reliable performance in small spaces. Suitable for use in temperatures from -30°C to 110°C.

Perfect for small devices like drones, model motors, or medical tools where space and precision matter. Compliant with RoHS and REACH standards for safe use.

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Product Parameters

  • Part Number MR85
  • Brand TFL
  • Interchangeable EZO
  • Bore Dia 5 mm
  • Bore Dia Tolerance -0.008mm to 0
  • Outer Dia 8 mm
  • Outer Dia Tolerance -0.008mm to 0
  • Width 2 mm
  • Width Tolerance -0.12mm to 0
  • Ball Qty 8
  • Ball Dia 1.0000 mm
  • Radial Clearance 0.002mm to 0.013mm
  • Seal Type Open
  • System of Measurement Metric
  • Bearing Type Ball
  • For Load Direction Radial
  • Construction Single Row
  • Inner Ring Type Standard
  • Tolerance Class ABEC1
  • Radial Clearance Trade No MC3
  • Ring Material Chrome Steel
  • Ball Material Chrome Steel
  • Cage Material Stainless Steel
  • Dynamic Radial Load 59 lbf
  • Static Radial Load 22 lbf
  • Temperature Range -30° to 110 °C
  • Lubrication Required
  • RoHS Compliant
  • REACH Compliant
  • Max Speed 53000 rpm
  • Weight 0.25 g
  • Price（$） 1.035
Metric Size Standard Miniature Ball Bearings MR85 dimension drawing
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Features

How Does MR85 Bearing Reduce Friction?

MR85 Bearing features chrome steel rings and balls, designed to minimise friction during operation.
Its precise construction ensures smooth radial movement, ideal for miniature applications.
With a dynamic radial load capacity of 59 lbf, it performs reliably in compact spaces.
The stainless steel cage maintains ball alignment, reducing wear and enhancing longevity.

Application

Common Applications of MR85 Bearing
MR85 Bearing is widely used in small electric motors, such as those found in cooling fans or handheld devices, due to its compact 5x8x2 mm size and smooth radial load handling. The open design simplifies lubrication, ensuring long service life in continuous operation.

Where Is MR85 Bearing Used?
You’ll often spot MR85 Bearing in precision instruments like optical encoders or miniature gearboxes, where its ABEC1 tolerance balances cost and performance. Its chrome steel construction handles moderate speeds well, making it a go-to for hobbyist projects too.

Built for Versatility: MR85 Bearing
In robotics, MR85 Bearing works nicely in joint assemblies or small actuators, thanks to its lightweight 0.25g design. The stainless steel cage prevents corrosion, which is handy for prototypes exposed to varied conditions.

Automotive vs Consumer Electronics: Applications of MR85 Bearing
While MR85 Bearing fits dashboard controls or throttle sensors in cars, it’s equally at home in printer rollers or drone motors. The 53,000 rpm limit covers most low-torque, high-speed needs across these fields.

Essential Roles of MR85 Bearing
For DIY repairs on household items like hair dryers or toy cars, MR85 Bearing’s metric sizing and affordability make it a practical pick. Just remember it requires regular grease to maintain peak performance.

Q&A

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