Designation systems

Metric radial shaft seals

Designations of all SKF metric radial shaft seals are prefixed by the letters CR, followed by the shaft diameter, housing bore diameter and nominal seal width (bore depth for HSF and HS seals) in millimetres, design and the code of the sealing lip material (fig 1).

Inch-size radial shaft seals

Inch-size SKF radial shaft seals are identified by their stock number that consists of four to seven digits, prefixed by the letters CR. The stock number provides an indication of seal size.
Four-figure numbers are used for radial shaft seals for
shaft diameters:d1 ≤ 1 in., e.g.
CR 3680d1 = 0.375 in.
Five-figure numbers are used for radial shaft seals for
shaft diameters:d1 ≤ 10 in., e.g.
CR 41287d1 = 4.125 in.
CR 97545d1 = 9.750 in.
Six- and seven-figure numbers are used for radial shaft seals for
shaft diameters:d1 ≥ 10 in., e.g.
CR 120061d1 = 12 in.
CR 1375242d1 = 13.75 in.