Inch Miniature Ball Bearings are one of the classifications under ball bearings . In Runstar Bearing, they are usually referred to a ball bearing from a bore diameter of 1mm to 10mm. they are usually called as instrument bearings or micro bearings that are widely used in widely used in the fields of precision instrument,home application,medical device,massage equipment,sports equipment,textile machinery,woodworking machinery,motor,power tool,water pump,air compressor,fishing reel and Yoyo etcs.Runstar Bearing has a full dimention of Stainless steel Inch Miniature Bearings for choice, the precision tolerance is from ABEC-1 to ABEC 9 for choice, there are 440(9Cr18),420(9Cr13) for choice in Runstar, 316 is sometimes available. Custom-made products is accepted in Runstar. All Runstar’s Bearings are strictly controlled under ISO9001:2015.

PART NUMBERSEAL TYPEBore diameter(d)Outer diameter(D)Width(B)BALL SIZE(mm)BALL QTYweight(g)
SR09open1/25"︱1.016mm1/8"︱3.175mm3/64"︱1.191mm0.63560.05
SR0 open3/64"︱1.191mm5/32"︱3.969mm0.0625"︱1.588mm0.670.1
SR0ZZShields3/64"︱1.191mm5/32"︱3.969mm3/32"︱2.381mm0.670.15
SR1open1/18"︱1.411mm3/16"︱4.763mm0.0781"︱1.984mm160.15
SR1ZZShields1/18"︱1.411mm3/16"︱4.763mm0.1094"︱2.779mm160.19
SR1-4open5/64"︱1.984mm1/4"︱6.35mm3/32"︱2.381mm170.4
SR1-4ZZShields5/64"︱1.984mm1/4"︱6.35mm0.1406"︱3.571mm170.53
SR1-4 2RSRubber seal5/64"︱1.984mm1/4"︱6.35mm0.1406"︱3.571mm170.53
SR1-5open3/32"︱2.381mm5/16"︱7.938mm0.1094"︱2.779mm1.58860.6
SR1-5ZZShields3/32"︱2.381mm5/16"︱7.938mm0.1406"︱3.571mm1.58861.15
SR1-5 2RSRubber seal3/32"︱2.381mm5/16"︱7.938mm0.1406"︱3.571mm1.58861.15
SR133open3/32"︱2.381mm3/16"︱4.762mm0.0625"︱1.588mm0.870.1
SR133ZZShields3/32"︱2.381mm3/16"︱4.762mm3/32"︱2.381mm0.870.15
SR133-2RSRubber seal3/32"︱2.381mm3/16"︱4.762mm3/32"︱2.381mm0.870.15
SR144open1/8"︱3.175mm1/4"︱6.35mm3/32"︱2.381mm170.27
SR144ZZShields1/8"︱3.175mm1/4"︱6.35mm0.1094"︱2.779mm170.4
SR144-2RSRubber seal1/8"︱3.175mm1/4"︱6.35mm0.1094"︱2.779mm170.4
SR2open1/8"︱3.175mm3/8"︱9.525mm5/32"︱3.967mm1.58871.04
SR2ZZShields1/8"︱3.175mm3/8"︱9.525mm5/32"︱3.967mm1.58871.37
SR2-2RSRubber seal1/8"︱3.175mm3/8"︱9.525mm5/32"︱3.967mm1.58871.37
SR2-5open1/8"︱3.175mm5/16"︱7.938mm0.1094"︱2.779mm1.58860.5
SR2-5ZZShields1/8"︱3.175mm5/16"︱7.938mm0.1406"︱3.571mm1.58860.74
SR2-5-2RSRubber seal1/8"︱3.175mm5/16"︱7.938mm0.1406"︱3.571mm1.58860.74
SR2-6open1/8"︱3.175mm3/8"︱9.525mm0.1094"︱2.779mm1.58870.96
SR2-6ZZShields1/8"︱3.175mm3/8"︱9.525mm0.1406"︱3.571mm1.58871.23
SR2-6-2RSRubber seal1/8"︱3.175mm3/8"︱9.525mm0.1406"︱3.571mm1.58871.23
SR2Aopen1/8"︱3.175mm1/2"︱12.7mm0.1719"︱4.366mm1.58873.3
SR2AZZShields1/8"︱3.175mm1/2"︱12.7mm0.1719"︱4.366mm1.58871.23
SR2A-2RSRubber seal1/8"︱3.175mm1/2"︱12.7mm0.1719"︱4.366mm1.58871.23
SR155open5/32"︱3.969mm5/16"︱7.938mm0.1094"︱2.779mm1100.51
SR155ZZShields5/32"︱3.969mm5/16"︱7.938mm1/8"︱3.175mm1100.61
SR155-2RSRubber seal5/32"︱3.969mm5/16"︱7.938mm1/8"︱3.175mm1100.61
SR156open3/16"︱4.762mm5/16"︱7.938mm0.1094"︱2.779mm1100.4
SR156ZZShields3/16"︱4.762mm5/16"︱7.938mm1/8"︱3.175mm110
SR156-2RSRubber seal3/16"︱4.762mm5/16"︱7.938mm1/8"︱3.175mm110
SR166open3/16"︱4.762mm3/8"︱9.525mm1/8"︱3.175mm1.58880.81
SR166ZZShields3/16"︱4.762mm3/8"︱9.525mm1/8"︱3.175mm1.58880.85
SR166-2RSRubber seal3/16"︱4.762mm3/8"︱9.525mm1/8"︱3.175mm1.58880.85
SR3open3/16"︱4.762mm1/2"︱12.7mm5/32"︱3.967mm2.38172.21
SR3ZZShields3/16"︱4.762mm1/2"︱12.7mm0.1960"︱4.978mm2.3817
SR3-2RSRubber seal3/16"︱4.762mm1/2"︱12.7mm0.1960"︱4.978mm2.3817
SR3Aopen3/16"︱4.762mm5/8"︱15.8750.1960"︱4.978mm2.38185.08
SR3AZZShields3/16"︱4.762mm5/8"︱15.8750.1960"︱4.978mm2.38185.08
SR3A-2RSRubber seal3/16"︱4.762mm5/8"︱15.8750.1960"︱4.978mm2.38185.08
SR168open1/4"︱6.35mm3/8"︱9.525mm1/8"︱3.175mm1110.57
SR168ZZShields1/4"︱6.35mm3/8"︱9.525mm1/8"︱3.175mm1110.6
SR168-2RSRubber seal1/4"︱6.35mm3/8"︱9.525mm1/8"︱3.175mm1110.6
SR188open1/4"︱6.35mm1/2"︱12.7mm1/8"︱3.175mm281.6
SR188ZZShields1/4"︱6.35mm1/2"︱12.7mm3/16"︱4.762mm282.32
SR188-2RSRubber seal1/4"︱6.35mm1/2"︱12.7mm3/16"︱4.762mm282.32
SR4open1/4"︱6.35mm5/8"︱15.8750.1960"︱4.978mm2.38184.46
SR4ZZShields1/4"︱6.35mm5/8"︱15.8750.1960"︱4.978mm2.38184.54
SR4-2RSRubber seal1/4"︱6.35mm5/8"︱15.8750.1960"︱4.978mm2.38184.54
SR4Aopen1/4"︱6.35mm3/4"︱19.05mm0.2188"︱5.5583.567.48
SR4AZZShields1/4"︱6.35mm3/4"︱19.05mm0.2188"︱5.5583.5610
SR4A-2RSRubber seal1/4"︱6.35mm3/4"︱19.05mm0.2188"︱5.5583.5610
SR1810open5/16"︱7.938mm1/2"︱12.7mm5/32"︱3.967mm1.2121.39
SR1810ZZShields5/16"︱7.938mm1/2"︱12.7mm5/32"︱3.967mm1.2121.57
SR1810-2RSRubber seal5/16"︱7.938mm1/2"︱12.7mm5/32"︱3.967mm1.2121.57
SR6open3/8"︱9.525mm7/8"︱22.2250.2188"︱5.5583.9779.02
SR6ZZShields3/8"︱9.525mm7/8"︱22.2250.2812"︱7.142mm3.97711.7
SR6-2RSRubber seal3/8"︱9.525mm7/8"︱22.2250.2812"︱7.142mm3.97711.7
SR8open1/2"︱12.7mm1 1/8"︱34.925mm1/4"︱6.35mm4.762811.6
SR8ZZShields1/2"︱12.7mm1 1/8"︱34.925mm5/16"︱7.938mm4.762824.1
SR8-2RSRubber seal1/2"︱12.7mm1 1/8"︱34.925mm5/16"︱7.938mm4.762824.1