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Metric Size Standard Miniature Ball Bearings MR84

Metric Size Standard Miniature Ball Bearings MR84

The MR84 is a compact miniature ball bearing with a 4mm bore and 8mm outer diameter, crafted from durable chrome steel. It handles radial loads up to 76 lbf and spins smoothly at speeds up to 56,000 RPM.

Its open design allows for easy lubrication, while the stainless steel cage ensures reliable performance. The bearing operates well in temperatures ranging from -30°C to 110°C.

With a lightweight build of just 0.39g, it’s ideal for small-scale applications like model making or precision instruments. Compliant with RoHS and REACH standards, it’s a safe and practical choice for various uses.

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Product Parameters

  • Part Number MR84
  • Brand TFL
  • Interchangeable EZO
  • Bore Dia 4 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 7
  • Ball Dia 1.2000 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 76 lbf
  • Static Radial Load 25 lbf
  • Temperature Range -30° to 110 °C
  • Lubrication Required
  • RoHS Compliant
  • REACH Compliant
  • Max Speed 56000 rpm
  • Weight 0.39 g
  • Price（$） 1.035
Metric Size Standard Miniature Ball Bearings MR84 dimension drawing
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Features

Why Choose MR84 Bearing for Precision Tasks?

MR84 Bearing features a compact 4mm×8mm×2mm design, ideal for applications requiring precise radial load handling.
Its chrome steel construction ensures durability while maintaining smooth operation under dynamic loads up to 76 lbf.

The open seal type and ABEC1 tolerance class make MR84 Bearing suitable for high-speed tasks, reaching up to 56,000 rpm.
With stainless steel cage and uniform ball alignment, it offers reliable performance in varied temperature conditions.

MR84 Bearing’s lightweight 0.39g design simplifies integration into miniature assemblies without compromising strength.
Its radial clearance range of 0.002mm to 0.013mm ensures consistent precision in sensitive mechanical systems.

Application

Common Applications of MR84 Bearing
MR84 Bearing is widely used in small electric motors, such as those found in cooling fans or handheld tools, thanks to its compact 4mm bore and lightweight design. The open seal type allows for easy lubrication, extending its service life in continuous-use scenarios.

In robotics, MR84 Bearing provides smooth rotation for joints and gears in miniature robotic arms, where precision and low friction are key. Its chrome steel construction ensures durability even in repetitive motion applications.

For medical devices like dental handpieces, MR84 Bearing’s small size and ABEC1 tolerance make it ideal for high-speed rotations. The stainless steel cage prevents contamination, crucial in sterile environments.

Consumer electronics like miniature drones often rely on MR84 Bearing for their propeller mechanisms. The 2mm width fits neatly into tight spaces without compromising performance.

Industrial sensors and measuring equipment benefit from MR84 Bearing’s radial load capacity, ensuring accurate readings over time. Its metric sizing simplifies replacement in European-manufactured devices.

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