Bearings with inch dimensions

Single row deep groove ball bearings with inch dimensions for the aftermarket also belong to the SKF standard assortment. The dimensions of these bearings follow the British standard BS 292:Part 2:1982. This standard has subsequently been withdrawn in 1997 as a consequence of metrication. It is recommended not to use these inch bearings for new bearing arrangement designs.

Designs

SKF inch deep groove ball bearings have the same deep raceway grooves and close conformity between raceways and balls as the corresponding metric deep groove ball bearings. They do not contain filling slots and can carry axial loads acting in both directions in addition to radial loads, even at high speeds.
The assortment of SKF inch deep groove ball bearings comprises bearings in the EE(B), RLS and RMS series, which are available as
  • open, basic design bearings (fig 1)
  • bearings with shields on both sides, designation suffix 2Z (fig 2)
  • bearings with seals on both sides, designation suffix 2RS1 (fig 3)
for shaft diameters from 1/4 to 41/2 inches.

Sealed bearings

Inch bearings with shields or seals on both sides are lubricated for life and are maintenance-free. Depending on the size they are charged with a premium quality, mineral oil based grease
  • MT33 with a lithium thickener, to a consistency of 2 on the NLGI scale, and characteristics according to the table (bearings with an outside diameter up to 63,5 mm)
  • MT47 with a lithium-calcium thickener, to a consistency of 3 on the NLGI scale, and characteristics according to the table (bearings with an outside diameter 63,5 mm and above).

Cages

Depending on the size, SKF inch single row deep groove ball bearings are equipped as standard with
  • an injection moulded snap-type cage of glass fibre reinforced polyamide 66, ball centred, designation suffix TN9
  • a riveted cage of pressed steel, ball centred, no designation suffix.

Tolerances and radial internal clearance

Inch bearings are manufactured to Normal tolerances, according to standard BS 292:Part 2:1982 and with Normal radial internal clearance, which conforms to ISO 5753:1991.