Brand We Carry
SKF sells steel balls loose, as precision components. They replace balls in mechanisms that use free balls, such as check valves, detents, guides and hand-assembled bearings, and they go into new designs as well. You order them by diameter and precision grade, and the designation carries both.
View all SKF bearings part numbers →SKF buyer's guide →Steel balls, all brands →SKF deep groove ball bearings →SKF cylindrical roller bearings →
In RB-3/G10, RB is the product line, 3 is the diameter in millimeters and G10 is the grade. RB-6/G10 is a 6 millimeter ball in the same grade. Many diameters carry decimals because they are inch sizes given in millimeters: RB-3.175/G20W is a one-eighth inch ball and RB-7.144/G16 a nine thirty-seconds inch ball.
The grade expresses how precise the ball is in form and size; a lower number means a more precise ball. Letters next to the grade or the diameter identify the version or the material, and they have to be copied too. Balls of the same diameter but different grades should never go into the same set.
Every ball in a set should come from the same lot or, at minimum, share the same grade and diameter sorting. A ball that is slightly oversized takes the whole load and gets marked, while an undersized one does nothing. So when one fails, you replace the full set, not just that ball.
Material matters as well. A bearing steel ball rusts in wet service, which is where stainless balls or other materials come in. When the ball is the closing element of a valve, the seat hardness and the fluid weigh as much as the diameter in the choice.
Send the full designation and how many balls you need. If you do not have it, measure the diameter with a micrometer rather than a caliper and give us the reading to three decimal places. Tell us the application, how many balls the set holds and whether they run in water, oil or another fluid. If they are spares for a bearing, include the bearing designation.
They are precision grades. The lower the number, the more precise the ball.
We do not recommend it. Replace the whole set with balls of the same grade and lot.
It is one-eighth of an inch expressed in millimeters. Many diameters come from inch fractions.
Can't find the exact model? Tell us the part number or model you need. We'll track it down and quote it, whether or not it appears in our catalog.
SKF steel balls serve as rolling elements in bearings, valves, dispensers and other mechanisms where friction must stay low. They come in hard steels and are organized by diameter and precision grade. MR Industrial Accessories LLC supplies these balls for both replacement work and manufacturing. If you are unsure which size fits, send us a message on WhatsApp.
Example part numbers:RB-1.5/G20WRB-2.5/G20WRB-2/G20WRB-3.5/G20WRB-3.175/G20W
SKF RB steel balls are precision rolling elements found in bearings, valves, and mechanisms that need low-friction movement. The line is organized by nominal diameter and by the G precision grade, which sets tolerances for size and roundness. We supply these balls to maintenance teams and project buyers across the United States and Latin America.
Example part numbers:RB-3/G10RB-6/G10RB-7.144/G10RB-7.144/G16RB-7.938/G10
SKF RB RS series steel balls are precision rolling elements used in bearings, valves, pumps, and other mechanisms that require smooth motion. Their polished surface and controlled dimensional tolerance support uniform load distribution. MR Industrial Accessories supplies this line to customers across the United States and Latin America, with technical guidance to match the right ball to your application.
Example part numbers:RB-5 RSRB-6.35 RSRB-7.938 RSRB-9.525 RSRB-19.05 RS
The manufacturer part number is all we need: we'll quote it and share dimensions and equivalents via WhatsApp or email.
