684ZZ is a miniature double shielded deep groove ball bearing with 4 mm bore diameter. Its bearing ring is made of 52100 chrome steel (Gcr15), and bearing cage is made of stainless steel. Its stainless steel version is S684ZZ, which the ring material is made of 440C stainless steel (316L and 304 stainless steel version are also available upon request). 684ZZ is a single row construction miniature deep groove ball bearing with 7 pieces of steel balls assembled with the cage. The ball size is 1.588 mm in diameter. The bearing net weight is 1.0 gram.

684ZZ is a metric size miniature deep groove ball bearing with a dimension of 4x9x4 mm. Its bore diameter is 4 mm, outer diameter is 9 mm, and thickness is 4 mm. It is an ABEC-1 grade ball bearing, the tolerance of bore and outer diameter is -0.008 to 0 mm, and the tolerance of width is -0.12 to 0 mm. Its radial clearance is 0.002 to 0.013 mm, which it is MC3 grade.

684ZZ bearing can bear a dynamic radial load of 545 Newton, and a static radial load of 182 Newton. Lubrication is required, and with the oil lubricating its rotating max speed can reach up to 53,000 rpm. It is suitable to work in a temperature condition between -30℃ to 110℃.

With its miniature sizes, high speed but lower load, 684ZZ bearing is widely used in applications like precision instruments and micro motors, etc. Fitrun Bearing is a professional manufacturer of miniature ball bearings with 20 years bearing manufacturing experience. We can customize the bearing to fit your special applications. Please contact us to get a free and quick quotation for your custom bearings.