Miniature Inch BearingsPart Interchange

Open

Sealed

Shielded

Open bearings dissipate heat more efficiently than shielded and sealed bearings.

Shielded bearings block out dust and other contaminants, but do not dissipate heat as efficiently as open bearings.

Sealed bearings block out dust and other contaminants better than open and shielded bearings, but retain the most heat.

Product
Number
Seal
Type
Bore Dia (d) Outer Dia (D) Width (B) Dynamic
Load
Rating
(Cr) (N)
Static
Load
Rating
(Cor) (N)
MAX
SPEED
(GREASE)
(X1000
RPM)
R09 Open 0.04" | 1.016mm 0.1250" | 3.175mm 0.0469" | 1.191mm 20 5 130
R0 Open 0.0469" | 1.191mm 0.1562" | 3.967mm 0.0625" | 1.588mm 21 6 110
R0zz Shielded 0.0469" | 1.191mm 0.1562" | 3.967mm 0.0937" | 2.380mm 21 6 110
R1 Open 0.055" | 1.397mm 0.1875" | 4.763mm 0.0781" | 1.984mm 44 12 90
R1zz Shielded 0.055" | 1.397mm 0.1875" | 4.763mm 0.1094" | 2.779mm 44 12 90
R1-4 Open 0.0781" | 1.984mm 0.2500" | 6.350mm 0.0937" | 2.380mm 54 17 67
R1-4 2rs Sealed 0.0781" | 1.984mm 0.2500" | 6.350mm 0.1406" | 3.571mm 54 17 67
R1-4zz Shielded 0.0781" | 1.984mm 0.2500" | 6.350mm 0.1406" | 3.571mm 54 17 67
R1-5 Open 0.0937" | 2.380mm 0.3125" | 7.938mm 0.1094" | 2.779mm 106 32 60
R1-5 2rs Sealed 0.0937" | 2.380mm 0.3125" | 7.938mm 0.1406" | 3.571mm 106 32 60
R1-5zz Shielded 0.0937" | 2.380mm 0.3125" | 7.938mm 0.1406" | 3.571mm 106 32 60
R133 Open 0.0937" | 2.380mm 0.1875" | 4.763mm 0.0625" | 1.588mm 36 11 80
R133 2rs Sealed 0.0937" | 2.380mm 0.1875" | 4.763mm 0.0937" | 2.380mm 36 11 80
R133zz Shielded 0.0937" | 2.380mm 0.1875" | 4.763mm 0.0937" | 2.380mm 36 11 80
R144 Open 0.125" | 3.175mm 0.2500" | 6.350mm 0.0937" | 2.380mm 54 17 67
R144 2rs Sealed 0.125" | 3.175mm 0.2500" | 6.350mm 0.1094" | 2.779mm 54 17 67
R144zz Shielded 0.125" | 3.175mm 0.2500" | 6.350mm 0.1094" | 2.779mm 54 17 67
R2 Open 0.125" | 3.175mm 0.3750" | 9.525mm 0.1562" | 3.967mm 121 39 56
R2 2rs Sealed 0.125" | 3.175mm 0.3750" | 9.525mm 0.1562" | 3.967mm 121 39 56
R2zz Shielded 0.125" | 3.175mm 0.3750" | 9.525mm 0.1562" | 3.967mm 121 39 56
R2-5 Open 0.125" | 3.175mm 0.3125" | 7.938mm 0.1094" | 2.779mm 107 32 60
R2-5 2rs Sealed 0.125" | 3.175mm 0.3125" | 7.938mm 0.1406" | 3.571mm 107 32 60
R2-5zz Shielded 0.125" | 3.175mm 0.3125" | 7.938mm 0.1406" | 3.571mm 107 32 60
R2-6 Open 0.125" | 3.175mm 0.3750" | 9.525mm 0.1094" | 2.779mm 122 41 53
R2-6 2rs Sealed 0.125" | 3.175mm 0.3750" | 9.525mm 0.1406" | 3.571mm 122 41 53
R2-6zz Shielded 0.125" | 3.175mm 0.3750" | 9.525mm 0.1406" | 3.571mm 122 41 53
R2A Open 0.125" | 3.175mm 0.5000" | 12.700mm 0.1719" | 4.366mm 122 41 53
R2A 2rs Sealed 0.125" | 3.175mm 0.5000" | 12.700mm 0.1719" | 4.366mm 122 41 53
R2Azz Shielded 0.125" | 3.175mm 0.5000" | 12.700mm 0.1719" | 4.366mm 122 41 53
R155 Open 0.1562" | 3.967mm 0.3125" | 7.938mm 0.1094" | 2.779mm 69 27 53
R155 2rs Sealed 0.1562" | 3.967mm 0.3125" | 7.938mm 0.1250" | 3.175mm 69 27 53
R155zz Shielded 0.1562" | 3.967mm 0.3125" | 7.938mm 0.1250" | 3.175mm 69 27 53
R156 Open 0.1875" | 4.763mm 0.3125" | 7.938mm 0.1094" | 2.779mm 69 27 53
R156 2rs Sealed 0.1875" | 4.763mm 0.3125" | 7.938mm 0.1250" | 3.175mm 69 27 53
R156zz Shielded 0.1875" | 4.763mm 0.3125" | 7.938mm 0.1250" | 3.175mm 69 27 53
R166 Open 0.1875" | 4.763mm 0.3750" | 9.525mm 0.1250" | 3.175mm 136 49 50
R166 2rs Sealed 0.1875" | 4.763mm 0.3750" | 9.525mm 0.1250" | 3.175mm 136 49 50
R166zz Shielded 0.1875" | 4.763mm 0.3750" | 9.525mm 0.1250" | 3.175mm 136 49 50
R3 Open 0.1875" | 4.763mm 0.5000" | 12.700mm 0.1562" | 3.967mm 249 88 43
R3 2rs Sealed 0.1875" | 4.763mm 0.5000" | 12.700mm 0.1960" | 4.978mm 249 88 43
R3zz Shielded 0.1875" | 4.763mm 0.5000" | 12.700mm 0.1960" | 4.978mm 249 88 43
R3A 2rs Sealed 0.1875" | 4.763mm 0.6250" | 15.875mm 0.1960" | 4.978mm 283 112 38
R3Azz Shielded 0.1875" | 4.763mm 0.6250" | 15.875mm 0.1960" | 4.978mm 283 112 38
R3A Open 0.1875" | 4.763mm 0.6250" | 15.875mm 0.1960" | 4.978mm 283 112 38
R168 Open 0.25" | 6.350mm 0.3750" | 9.525mm 0.1250" | 3.175mm 71 31 48
R168 2rs Sealed 0.25" | 6.350mm 0.3750" | 9.525mm 0.1250" | 3.175mm 71 31 48
R168zz Shielded 0.25" | 6.350mm 0.3750" | 9.525mm 0.1250" | 3.175mm 71 31 48
R188 Open 0.25" | 6.350mm 0.5000" | 12.700mm 0.1250" | 3.175mm 207 80 40
R188 2rs Sealed 0.25" | 6.350mm 0.5000" | 12.700mm 0.1875" | 4.763mm 207 80 40
R188zz Shielded 0.25" | 6.350mm 0.5000" | 12.700mm 0.1875" | 4.763mm 207 80 40
R4 Open 0.25" | 6.350mm 0.6250" | 15.875mm 0.1960" | 4.978mm 283 112 38
R4 2rs Sealed 0.25" | 6.350mm 0.6250" | 15.875mm 0.1960" | 4.978mm 283 112 38
R4zz Shielded 0.25" | 6.350mm 0.6250" | 15.875mm 0.1960" | 4.978mm 283 112 38
R4A Open 0.25" | 6.350mm 0.7500" | 19.050mm 0.2188" | 5.558mm 446 161 36
R4A 2rs Sealed 0.25" | 6.350mm 0.7500" | 19.050mm 0.2812" | 7.142mm 446 161 36
R4Azz Shielded 0.25" | 6.350mm 0.7500" | 19.050mm 0.2812" | 7.142mm 446 161 36
R1810 Open 0.3125" | 7.938mm 0.5000" | 12.700mm 0.1562" | 3.967mm 104 50 40
R1810 2rs Sealed 0.3125" | 7.938mm 0.5000" | 12.700mm 0.1562" | 3.967mm 104 50 40
R1810zz Shielded 0.3125" | 7.938mm 0.5000" | 12.700mm 0.1562" | 3.967mm 104 50 40
R6 Open 0.375" | 9.525mm 0.8750" | 22.225mm 0.2188" | 5.558mm 637 256 32
R6 2rs Sealed 0.375" | 9.525mm 0.8750" | 22.225mm 0.2812" | 7.142mm 637 256 32
R6zz Shielded 0.375" | 9.525mm 0.8750" | 22.225mm 0.2812" | 7.142mm 749 301 32

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