Ring gauge GRA 30 series

Conventional measuring methods and instruments are not always suitable for checking tapered seats or measuring the inside or outside envelope diameter of the roller set of a cylindrical roller bearing in precision applications. Therefore, SKF has developed an assortment of gauges specially designed to take the accurate measurements necessary when mounting cylindrical roller bearings with a tapered bore. These gauges are also useful for other than precision applications. Ring gauges in the GRA 30 series and DMB taper gauges can be used to check the most common tapered seats. A GRA ring gauge can only be used to check a tapered seat for a particular bearing size. DMB taper gauges, however, can be used for a range of diameters, as well as for tapers other than 1:12. To precisely adjust the radial internal clearance or preload when mounting a cylindrical roller bearing with a tapered bore, it is necessary to accurately measure the inside or outside envelope diameter of the roller set(s). SKF internal clearance gauges in the GB 30 and GB 10 series, and in the GB 49 series enable simple and accurate measuring. For information about other SKF measuring devices, contact the SKF application engineering service.