New standard of Slewing bearing

   On February 1, 2008, the National Development and Reform Commission issued a new standard for slewing bearings that our company participated in drafting. 1. Replace JG/T 68-1999 “Three-row column slewing ring for construction machinery” by JB/T 10837-2008 “Three-row column slewing bearing for building construction machinery and equipment”; 2. by JB/T 10838-2008 “Building machinery and equipment single row cross roller (cone) type slewing ring” replaces JG/T 67-1999 “Single row cross roller (cone) type slewing ring for construction machinery”, the new standard cancels the original appendix 1 “Supplement Series Specifications”; 3. JB/T 10839-2008 “Building Construction Machinery and Equipment Single Volleyball Slewing Bearing” replaces JG/T 66-1999 “Single Volleyball Slewing Bearing for Construction Machinery”, the new standard adds overlap segment configuration, Cancel some of the commonly used specifications, added some specifications, increased to 48; cancel the original Appendix A “Supplemental Series Specifications”; performance curve according to d0 ≤ 40, 57HRC, d0 ≥ 50, 55HRC.

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