22218 Bearing Dimensions

Tolerances and fits for 22218

FULI makes 22218 to P0 as standard, with P6 on request. P0 is the Normal tolerance class of ISO 492; P6 limits are tighter. These are the P0 limits for the 90 × 160 × 40 mm size.

Δdmp and ΔDmp: deviation of the mean bore and mean outside diameter in one radial plane. ΔBs: inner ring width; the outer ring width has the same limits.

Shaft and housing fits (general guidance)

For an inner ring that turns with a solid steel shaft under normal load, bearing makers’ fit tables give 90 m6 for the shaft of 22218. The housing bore is usually H7, or J7 where the outer ring must not creep.

Taking the loosest and the tightest combination of limits, a P0 22218 on a 90 mm m6 shaft has 13 to 55 µm interference. Its outer ring has 0 to 65 µm clearance in an H7 bore and 14 µm interference to 51 µm clearance in a J7 bore.

This is general guidance, not a FULI specification. Heavy or shock loads, a hollow shaft, a thin-walled, split or light-alloy housing, or a large temperature difference between shaft and housing call for other classes, and the drawing of your machine takes priority. A tight shaft fit or a hot housing uses up internal clearance, and that is when C3 is chosen instead of C0.

If the outer ring turns and the shaft stands still, as in an idler pulley or a wheel hub, the fits are reversed: the housing gets the interference fit (for example N7 or P7) and the shaft a sliding one (g6 or h6).

Sources: ISO 492 tables as printed in the NTN catalogue CAT. No. 2203/E (Tables 6.4 and 6.5) and the RKB tolerance catalogue; ISO 286-2 for the seats; SKF and NTN fit tables for the shaft and housing classes.

22218 compared with nearby sizes

22218 measures 90 × 160 × 40 mm: bore d, outside diameter D and width B.

22315 has the same 160 mm outside diameter with a 75 mm bore, so it fits the same housing bore on a smaller shaft.

In the 222 series the sizes either side of 22218 are 22217 for a 85 mm shaft and 22220 for a 100 mm shaft.

Cr and weight from FULI's catalog; — = not listed on this site.

22218 weight, load ratings and speed

FULI's catalog gives the weight of 22218 as about 3.40 kg, so 100 bearings weigh about 340 kg and 1,000 about 3400 kg before packing. The cylindrical bore (W33) and tapered bore (K/W33) versions share this catalog line.

22218 has a dynamic load rating Cr of 325 kN and a static load rating C0r of 375 kN. Cr is the load used to work out rating life; C0r is the reference for loads carried while the bearing is stationary or turning slowly. The catalog lists two speed values, 3,800 and 5,300 rpm, without stating the lubrication for each column.

Values from FULI's catalog; confirm for your application.

22218 bore and clearance versions

FULI's catalog lists 22218 in two bore versions on one line, both 90 × 160 × 40 mm: 22218W33 with a cylindrical bore and 22218K/W33 with a 1:12 tapered bore. W33 marks the lubrication groove and holes in the outer ring. The K version is mounted on an adapter sleeve, a withdrawal sleeve or a tapered shaft seat. Radial clearance is C0 as standard and C3 on request.

22218 dimensions in inches

The nearest common inch shaft size to the 90 mm bore of 22218 is 3-9/16 in (90.49 mm), 0.49 mm larger than the bore, so 22218 will not go on it. Inch shafts need an inch bearing, not a metric one with a sleeve or shim.

Converted at 1 in = 25.4 mm and rounded to four decimals. The bearing itself is made to the millimetre sizes.

Grease for 22218

Relubricating 22218 from the side takes about 32.0 g each time by the formula in our grease calculator: 0.005 × D × B = 0.005 × 160 × 40. 22218W33 has a lubrication groove and holes in the outer ring; when grease goes in through them the formula is 0.002 × D × B, about 12.8 g for 22218.

How FULI supplies 22218

The standard 22218 from FULI has GCr15 chrome steel rings and rollers, P0 precision and C0 radial clearance, with P6 and C3 on request.

Rings are marked with a brand you are authorised to use, with the FULI brand, or left neutral, as your order states. The box is printed with the model, precision class and brand.

Inquiries that leave out the prefix or suffix letters are the usual cause of a wrong quote, so write the full designation, for example 22218K/W33 C3.

Tools and guides for 22218

• Bearing size finder: look up a size from bore, OD and width
• Bearing weight chart
• Bearing grease fill calculator
• Shaft and housing tolerance chart
• Bearing internal clearance: C0, C3 and when to change
• Bearing lubrication basics
• Ball bearing vs roller bearing
• All bearing products and model pages