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Introduction to Bearings

Miniature Bearing Size Chart

Miniature Bearing Size Chart

  • 2021/01/31


Miniature bearings are means  bearing inner diameter less than 10 mm.


ZZ BEARINGS Can Produce Inch miniature bearing for you ,below here is bearing size for your reference .



And for bearings we can produce at customer requirements ,such as different precision ABEC-1,ABEC-3,ABEC-5,ABEC-7 ,different material stainless steel ,ceramic material.


Shape Dimension Ball Complement
Type Bore Diameter (d) Outer Diameter (D) Width for open type(B) Width for shield type(B1) Radius rs(min) size Qty
mm mm mm mm mm mm 6
R1-4zz 1.984 6.35 2.38 3.571 0.1 1 7
R133zz 2.38 4.762 1.588 2.38 0.1 0.8 7
R1-5zz 2.38 7.938 2.779 3.571 0.15 1.588 6
R144Jzzs 3.175 6.35 2.38 2.779 0.1 1 8
R2-5zz 3.175 7.938 2.779 3.571 0.1 1.588 6
R2-6zz 3.175 9.525 2.779 3.571 0.15 1.588 7
R2zz 3.175 9.525 3.967 3.967 0.3 1.588 7
R2Azz 3.175 12.7 4.366 4.366 0.3 1.588 7
R155zzs 3.967 7.938 2.779 3.175 0.1 1 10
R156zzs 4.762 7.938 2.779 3.175 0.1 1 10
R166zzs 4.762 9.525 3.175 3.175 0.1 1.588 8
R3zz 4.762 12.7 3.967 4.978 0.3 2.381 7
R3Azz 4.762 15.875 4.978 4.978 0.3 2.381 8
R168zzs 6.35 9.525 3.175 3.175 0.1 1 11
R188zz 6.35 12.7 3.175 4.762 0.15 2 8
R4zz 6.35 15.875 4.978 4.978 0.3 2.381 8
R4Azz 6.35 19.05 5.558 7.142 0.4 3.5 6
R1810zzs 7.938 12.7 3.967 3.967 0.15 1.2 12
R6zz 9.525 22.225 5.558 7.142 0.4 3.969 7
R1038zz 9.525 15.875 3.967 3.967 0.15
R1212zz 12.7 19.05 3.967 3.967



Small bearings have widely applications ,such as fror instrument bearings or micro bearings used for gyros, anemometers, flow meters, miniature gearboxes, small motors and radio controlled models.

mr84 bearing
mr83 bearing



MKL also can produce miniature bearings are also available with a flange on the outer ring,below here is our miniature flange bearing for your reference .


Type Bore Diameter (d) Outer Diameter (D) Flange Width Flange Width(c)
Outer Diameter (b)
(D1) open zz open zz
FR1-4zzs 1.984 6.35 7.518 2.38 3.571 0.584 0.787
FR133zz 2.38 4.762 5.944 1.588 2.38 0.457 0.787
FR1-5zzs 7.938 9.119 2.779 3.571 0.584 0.787
FR144zzs 6.35 7.518 2.38 2.779 0.584 0.787
FR2-5zz 3.175 7.938 9.119 2.779 3.571 0.584 0.787
FR2-6zzs 9.525 10.719 2.779 3.571 0.584 0.787
FR2zz 9.525 11.176 3.967 3.967 0.762 0.762
FE155zzs 3.967 7.938 9.119 2.779 3.175 0.584 0.914
FR156zzs 4.762 7.938 9.119 2.779 3.175 0.584 0.914
FR166zz 9.525 10.719 3.175 3.175 0.584 0.787
FR3zz 12.7 14.351 4.978 4.978 1.067 1.067
FR168zzs 6.35 9.525 10.719 3.175 3.175 0.584 0.914
FR188zz 12.7 13.894 3.175 4.762 0.584 1.143
FR4zz 15.875 17.526 4.978 4.978 1.067 1.067
FR1810zzs 7.938 12.7 13.894 3.967 3.967 0.787 0.787
FR6zz 9.525 22.225 24.613 5.558 7.142 1.57 1.57


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