NACHI 23038EW33C3 Spherical Roller Bearing 190x290x75 mm, Straight bore, C3

This range covers 6 NACHI E-Series double row spherical roller bearings with straight (cylindrical) bore, W33 outer ring oil holes and groove, and C3 radial internal clearance, from 140 to 240 mm bore (outer diameters 290 to 360 mm, widths 75 to 114 mm). Select the size from the drop-down: each size has its own bearing number, load ratings and speeds in the Model Details.

Spherical roller bearings have two rows of rollers running on a spherical outer ring raceway. They carry heavy radial loads and moderately high axial loads in both directions, have a high impact-load capacity, and tolerate shaft deflection or mounting error.

These are E-series bearings: the E in the model number is the roller bearing design change symbol, and the load ratings and limiting speeds are the general catalogue E-series figures. They are rated on a different basis to the EXQ bearings, so compare speeds only between bearings from the same table.

Where this product is used

• Paper mill and rolling mill equipment, and other large machines where shaft deflection or mounting error can occur
• Gearboxes and industrial transmissions carrying heavy radial and combined loads
• Fans, blowers and pumps
• Conveyors, crushers and mining and mineral processing machinery
• General heavy industrial machinery

Features

• Double row spherical roller bearings: the spherical outer ring raceway lets the bearing tolerate shaft deflection and mounting error, about 2 degrees of misalignment under general service conditions
• E-series design with the load ratings and limiting speeds of the general catalogue E rows
• Heat-stabilised as standard for service up to 200 °C, with minimal dimensional change
• W33 outer ring: oil holes and an oil groove to feed lubricant to the rollers, with hole, groove and hole count tabulated for every size
• C3 radial internal clearance, larger than Normal: 145 to 190 µm on the smallest bore up to 240 to 320 µm on the largest
• Load ratings, speeds and mass for every size are taken from the manufacturer’s catalogue; the speed basis is the limiting speed in the general catalogue

Key specifications

Available sizes

Speeds are the limiting speed figures (general catalogue).

Selecting the right option

Choose the bore first, then the outer diameter and width. The first three digits of the model are the bearing series (22300, 23000, 23200 here), and the last two digits multiplied by 5 give the bore in mm, so 22216 is an 80 mm bore. Within one bore size the series changes the outer diameter and width, and with them the load rating.

Every bearing on this page is an E-series design, so the speeds are the general catalogue limiting speeds. EXQ bearings are rated on a different basis (the EXQ brochure), so compare speeds only between bearings from the same table.

C3 clearance is larger than Normal. It suits a tight shaft fit or a temperature difference between the inner and outer ring, both of which take up clearance; the Model Details give the exact micrometre range for each size.

The bore is straight, so the bearing is mounted on a plain shaft with a suitable fit.

Fitting and use

Where there is axial load, keep Fa at or below 0.6 Fr. A bearing running with no load can skid, so apply a load greater than 0.02 Cr.

Misalignment of about 2 degrees is permitted under general service conditions. Misaligned bearings run noisier as speed rises, so the practical limit can be lower.

W33 means the outer ring has oil holes and an oil groove. Line the housing lubricant port up with the groove so lubricant reaches the rollers.

Related products

Other NACHI spherical roller bearings: NACHI E-series spherical roller bearings with tapered bore (11 sizes, 40 to 190 mm bore), NACHI EXQ spherical roller bearings with straight bore (60 sizes, 25 to 160 mm bore), NACHI EXQ spherical roller bearings with tapered bore (62 sizes, 25 to 180 mm bore) and NACHI spherical roller thrust bearings (5 sizes).