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Metric Size Standard Miniature Ball Bearings 684
Metric Size Standard Miniature Ball Bearings 684

Metric Size Standard Miniature Ball Bearings 684

The 684 is a compact miniature ball bearing, measuring just 4mm by 9mm by 2.5mm, crafted from durable chrome steel. It supports radial loads up to 123 lbf and spins smoothly at speeds up to 53,000 RPM.

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

With a standard inner ring and ABEC1 tolerance, it offers consistent precision for small applications. Ideal for uses like small motors or precision instruments where space is limited.

Weighing only 0.65g, it’s lightweight yet sturdy. Compliant with RoHS and REACH standards for safe and versatile use.

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Product Parameters

  • Part Number 684
  • Brand TFL
  • Interchangeable EZO
  • Bore Dia 4 mm
  • Bore Dia Tolerance -0.008mm to 0
  • Outer Dia 9 mm
  • Outer Dia Tolerance -0.008mm to 0
  • Width 2.5 mm
  • Width Tolerance -0.12mm to 0
  • Ball Qty 7
  • Ball Dia 1.5880 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 123 lbf
  • Static Radial Load 41 lbf
  • Temperature Range -30° to 110 °C
  • Lubrication Required
  • RoHS Compliant
  • REACH Compliant
  • Max Speed 53000 rpm
  • Weight 0.65 g
  • Price($) 1.035

Features

Performance Features of 684 Bearing

684 Bearing is crafted with chrome steel rings and balls, offering reliable radial load support.
Its compact size of 4 mm×9 mm×2.5 mm makes it ideal for space-constrained applications.
The stainless steel cage ensures smooth operation, even at high speeds up to 53,000 rpm.
With a dynamic radial load capacity of 123 lbf, it balances strength and efficiency.

Application

Key Fields for 684 Bearing
In small electric motors, 684 Bearing is a reliable choice due to its compact size and smooth operation. Its chrome steel construction ensures durability in continuous use.

Where Is 684 Bearing Used?
You’ll often find 684 Bearing in precision instruments like dental drills or camera lenses. Its low friction and high-speed capability make it ideal for delicate applications.

Built for Versatility: 684 Bearing
This bearing works well in household gadgets like electric shavers or miniature fans. The open design allows for easy lubrication, extending its lifespan.

Automotive vs Aerospace: Applications of 684 Bearing
In automotive models, 684 Bearing fits well in dashboard controls or small actuators. For aerospace, it’s suited for lightweight instruments where space is limited.

Practical Applications of 684 Bearing
684 Bearing is commonly used in robotics for joint movements due to its lightweight and precision. The stainless steel cage adds corrosion resistance for long-term use.

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