MR74ZZ is a tiny ball bearing with deep groove and metal double shielded. Its bearing ring is made of 52100 chrome steel (Gcr15), and bearing cage is made of stainless steel. Its stainless steel version is SMR74ZZ, which the ring material is made of 440C stainless steel (316L and 304 stainless steel version are also available upon request). MR74ZZ is a single row construction deep groove ball bearing with 8 pieces of steel balls assembled with the cage. The ball size is 1 mm in diameter. The bearing net weight is 0.33 gram.
MR74ZZ is a metric size miniature deep groove ball bearing with a dimension of 4x7x2.5 mm. Its bore diameter is 4 mm, outer diameter is 7 mm, and thickness is 2.5 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.
MR74ZZ ball bearing can bear a dynamic radial load of 264 Newton, and a static radial load of 92 Newton. Lubrication is required, and with the oil lubricating its rotating max speed can reach up to 60,000 rpm. It is suitable to work in a temperature condition between -30℃ to 110℃.
With its tiny sizes, high speed but lower load, MR74ZZ bearing is widely used in applications like precision instruments and micro electric motors, etc. Fitrun Bearing is a professional manufacturer of tiny 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.