The Timken Company - Fafnir® Miniature Ball Bearings (S..K)

Smarter Bearing Selection Is Here

The Timken ^® Syber ^® Bearing System Designer Tool now features Smart Selection, enabling users to find the right bearing faster by filtering options based on target life and key dimensions.

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Analyze Bearing Performance in an Application with Timken ^® Syber ^® Bearing System Designer

A powerful software tool that combines calculators and configurators to assist you with application design, bearing selection, installation, and troubleshooting. It’s free, easy-to-use, and accessible 24/7.

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Simplified Gear Force Analysis

Alex Waye, Timken Application Engineer, shows you how to instantly compute tangential, radial, and axial forces for better design decisions.

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Radial ball bearings consist of an inner and outer ring with a cage containing a complement of precision balls. The standard Conrad-type bearing has a deep-groove construction capable of handling radial and axial loads from either direction in versatile designs that permit relatively high-speed operation.

In addition to standard single-row deep groove bearings, Timken offers special designs, including a maximum capacity series and an extra large (XLS) radial series bearing.

Size range: 3 mm - 600 mm (0.12 in. - 23.62 in.) bore

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Unit of Measure

Items	S1PP Fafnir® Miniature Ball Bearings (S..K)	S3K Fafnir® Miniature Ball Bearings (S..K)	S5K Fafnir® Miniature Ball Bearings (S..K)	S5P Fafnir® Miniature Ball Bearings (S..K)	S7K Fafnir® Miniature Ball Bearings (S..K)
Design Units	N/A METRIC	N/A Imperial	N/A Imperial	N/A Imperial	N/A METRIC
d - Bore	N/A 1/4 in	N/A 0.3750 in	N/A 1/2 in	N/A 1/2 in	N/A 5/8 in
D - Outer Diameter	N/A 0.750 in19.05 mm	N/A 0.875 in22.225 mm	N/A 1.125 in28.575 mm	N/A 1.125 in28.58 mm	N/A 1.375 in34.93 mm
Bearing Width	N/A 0.2812 in7.14 mm	N/A 0.219 in5.56 mm	N/A 0.25 in6.35 mm	N/A 0.25 in6.35 mm	N/A 0.344 in8.73 mm
C0 - Static Radial Rating	N/A 240 lbf1050 N	N/A 320 lbf1423 N	N/A 540 lbf2402 N	N/A 540 lbf2390 N	N/A 750 lbf3320 N
Ce - Dynamic Radial Rating	N/A 700 lbf3100 N	N/A 830 lbf3692 N	N/A 1280 lbf5694 N	N/A 1270 lbf5670 N	N/A 1680 lbf7490 N
Limiting Speed (Grease)	N/A 24385 rpm	N/A 16900 rpm	N/A 13100 rpm	N/A 14537 rpm	N/A 11818 rpm
Limiting Speed (Oil)	N/A 28450 rpm	N/A 19700 rpm	N/A 15300 rpm	N/A 16959 rpm	N/A 13788 rpm
Ball Type	N/A STEEL
R - Inner Ring "To Clear" Radius	N/A 0.016 in0.41 mm	N/A 0.020 in0.4 mm	N/A 0.020 in0.4 mm	N/A 0.020 in0.4 mm	N/A 0.024 in0.61 mm
r - Outer Ring "To Clear" Radius¹	N/A 0.016 in0.41 mm	N/A 0.02 in0.4 mm	N/A 0.02 in0.4 mm	N/A 0.02 in0.4 mm	N/A 0.024 in0.61 mm
da - Inner Ring Backing Diameter	N/A 0.3500 in8.89 mm	N/A 0.4800 in12.200 mm	N/A 0.6100 in15.50 mm	N/A 0.6102 in15.50 mm	N/A 0.8000 in20.32 mm
Da - Outer Ring Backing Diameter	N/A 0.6900 in17.53 mm	N/A 0.8000 in20.300 mm	N/A 0.9900 in25.10 mm	N/A 0.9882 in25.10 mm	N/A 1.2400 in31.50 mm
Bearing Weight	N/A 0.009 Kg0.020 lb	N/A	N/A	N/A 0.018 Kg0.04 lb	N/A 0.032 Kg0.070 lb
¹ These maximum fillet radii will be cleared by the bearing corners.