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ISO 9001:2000 Certified Quality Management System

Bearing Shoulder Dimensions

Recommended Ball Bearing Shoulder Dimensions

Miniature and instrument ball bearings are used in high-precision applications to mate parts, control movement, and provide rotational and oscillating functionality. Aircraft, medical instruments, computers, flow meters, and pick-and-place robots are just some of the challenging applications they are found in. For example, some high-speed instrument bearings travel at speeds approaching 500,000 rpm. Flow meter bearings travel at slower speeds but face a unique set of pressure, corrosion, and environmental challenges. Finally, many miniature bearings are used in pulling and stressing manmade vacuums and the natural vacuum of space.

Within the assembled mechanism, the fit of the ball bearing on its mating components is vital to maximizing bearing life. If the fit is too loose, the bearings slide around on the shaft, eliminating the advantages gained by selecting a ball bearing in the first place. If the fit is too tight, the bearing integrity may be compromised by reduction of radial play in the assembly. The perfect fit enables bearings to run at peak performance for maximized end-product life.

For further assistance with bearing selection and design, please feel free to contact our engineering team or look at our online catalog.


Minimum and maximum shoulder dimensions
for optimum shaft and housing fits of miniature and instrument ball bearings.
Basic Size Minimun Shaft
Shoulder Diameter, In
Maximum Shaft
Shoulder Diameter, In
Maximum Fillet
Radius, In
SR09 0.060 0.105 0.003
SR0 0.071 0.132 0.003
SR1 0.079 0.164 0.003
SR1-4 0.102 0.226 0.003
SR133 0.114 0.168 0.003
SR1-5 0.122 0.284 0.003
SR144 0.148 0.226 0.003
SR2-5 0.153 0.284 0.003
SR2-6 0.153 0.347 0.005
SR155 0.180 0.288 0.003
SR156 0.210 0.288 0.003
SR166 0.216 0.347 0.003
SR168 0.272 0.352 0.003
SR188 0.284 0.466 0.005
SR1810 0.347 0.466 0.005
SR2 0.179 0.325 0.012
SR2A 0.179 0.446 0.012
SR3 0.244 0.446 0.012
SR4 0.310 0.565 0.012
SR4A 0.322 0.678 0.016
SR6 0.451 0.799 0.016