Conventional measurement methods and instruments are not always suitable for inspecting the tapered mounting surface of rolling bearings or measuring the inner and outer diameters of cylindrical roller bearing roller sets in precision applications. Therefore, JOJI has developed a series of specially designed gauges to meet the precise measurement needs when installing tapered bore cylindrical roller bearings. These gauges can also be used in other precision applications.

GRA 30 series ring gauges and DMB taper gauges can be used to inspect most common tapered seating surfaces. A GRA ring gauge can only be used to inspect the tapered seating surface of a specific bearing size. However, a DMB taper gauge can be used for a range of diameters and for tapers other than 1:12.

In order to accurately adjust the radial clearance or preload of tapered bore cylindrical roller bearings during installation, the circumscribed circle diameter and inscribed circle diameter of the roller must be accurately measured. JOJI GB 30 and JOJI 10 series or GB 49 series internal clearance gauges can easily measure accurate values.

For more information on other JOJI measurement equipment, please contact the JOJI Application Engineering Service.