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SKF inch deep groove ball bearings have the same construction as a metric deep groove ball bearing, with bore, outside diameter and width in inch dimensions. They appear on machines of British or North American origin, on old equipment and on agricultural machinery. They have no direct metric equivalent: that is why they have a separate line, and it is worth identifying them properly before looking for a replacement.
See all SKF bearings references →SKF guide →Deep groove ball bearings in inches from all brands →SKF deep groove ball bearings →SKF cylindrical roller bearings →
RLS 4 and RMS 5 belong to the two most common series: RLS is the light one and RMS the medium one, with a larger section for the same bore. The number gives the bore in eighths of an inch. The blocks that follow, as in RLS 4-2Z and RLS 4-2RS1, distinguish the execution, just as in metric bearings.
The R series, as in MRC.R8FF, is designated differently: its number gives the bore in sixteenths of an inch, and the final letters describe the closure. An 8 in one series and an 8 in another are not the same bore. That is why the number is never read alone, without the letters that go with it.
An inch bearing and a metric one of similar size differ by tenths of a millimetre. It seems little, but it is far more than any fit tolerance: the metric one is loose or simply does not go in. Forcing it damages the seat, and with a damaged seat even the original bearing no longer fits.
When the machine has no manual, the safe way to identify it is to measure with a caliper or micrometer and convert the three dimensions to fractions of an inch. If the results fall on round fractions, the bearing is an inch one. Also note whether both rings have the same width, because some old series have rings of different widths.
Send us the complete designation, with its letters, and the quantity. If it cannot be read, give us the measured bore, outside diameter and width, in millimetres or inches, and tell us whether it was open, shielded or sealed. State the machine, its origin if you know it and the position of the bearing. A photo of the marking, even if incomplete, helps recognize the series.
No. The difference in size is greater than any fit and the seat is damaged.
The bore, in eighths of an inch. In the R series it is given in sixteenths.
No. For the same bore, the outside diameter and the width change.
Can't find the exact model? Write to us with the part number or model you're looking for: we'll find it and quote it, even if it's not listed in the catalog.
The SKF RMS series inch deep groove ball bearing is a single row ball bearing with inch dimensions, designed to withstand moderate radial and axial loads. It is used in equipment where the shaft or housing is dimensioned in inches, such as imported machinery or older production lines. MR Accesorios Industriales sells this series.
The SKF RLS series inch deep groove ball bearing is an essential component for shafts with inch dimensions. Its single-row ball design withstands moderate radial and axial loads, offering reliable performance in various industrial applications. MR Accesorios Industriales supplies this series, providing solutions for Argentine industry.
Just the manufacturer part number is enough: we will quote it and provide dimensions and equivalents via WhatsApp or email.
