NACHI 23126EXQW33C3 Spherical Roller Bearing 130x210x64 mm, Straight bore, C3

The NACHI 23126EXQW33C3 is a double row spherical roller bearing with a straight (cylindrical) bore, W33 outer ring oil holes and groove, and C3 radial internal clearance. It measures 130 x 210 x 64 mm (bore x outer diameter x width), with a basic dynamic load rating of 690,000 N and a basic static load rating of 799,000 N.

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.

EXQ is the high-load-capacity EX bearing with the Q axial-load-capacity and high-speed specification. Raceway and roller curvature are optimised for axial load, a floating guide ring controls the roller movement, and a high-strength pressed steel cage encloses the roller set. The rings are made from high-cleanliness steel and heat-stabilised as standard for service up to 200 °C.

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 bearing: the spherical outer ring raceway lets the bearing tolerate shaft deflection and mounting error, about 2 degrees of misalignment under general service conditions
• EXQ design: raceway and roller curvature optimised for axial load, floating guide ring and a high-strength pressed steel cage, with higher permissible rotating speeds than the conventional E/EX row of the same size
• W33 outer ring: oil holes and an oil groove to feed lubricant to the rollers (5 mm holes, 6 off, groove 9 mm wide)
• C3 radial internal clearance, larger than Normal: 145 to 190 µm for this bore
• Basic dynamic load rating 690 kN and static 799 kN; heat-stabilised as standard for service up to 200 °C

Key specifications

Selecting the right option

This listing is one size, 130 x 210 x 64 mm. The speeds are the permissible rotating speed figures from the EXQ brochure.

As an EXQ design its permissible rotating speeds are higher than the conventional E/EX figures for the same size, so check which basis a comparison quote uses.

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 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/Fr at or below 0.8, and check with AIMS above that. A bearing running with no load can skid, so apply a radial load of at least 0.015 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. Check fluctuating loads, oscillating loads (such as shaker screens) and high speed with AIMS before ordering.

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 from AIMS: 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), NACHI E-series spherical roller bearings with straight bore (6 sizes, 140 to 240 mm bore), NACHI E-series spherical roller bearings with tapered bore (11 sizes, 40 to 190 mm bore) and NACHI spherical roller thrust bearings (5 sizes).