Standard of the First Machinery Industry Ministry of the People's Republic of China Thin-walled pipe bushing Marking example: Thin-walled pipe bushing with d of 12mn: Bushing 12JB1988-77 Issued by the First Machinery Industry Ministry of the People's Republic of China Proposed by the Standardization Institute of the First Machinery Industry MinistryJB1988- All√3 May 1, 1977 Shanghai Mechanical and Electrical Design Institute Drafted by Chongqing Heavy Duty Automobile Research Institute and others Dalian Combined Machine Tool Research InstitutewwW.bzxz.Net Total 2 Page 2 Pipe outer diameter Pipe inner diameter JB 1988-77 1. The material of rolled thin steel plate (GB708-65) for steel bushing is A3F. Copper bushings are made of cold-rolled brass sheet (YB460-64) and are rolled in H62. Other materials can be selected according to the use conditions, which shall be agreed upon by both parties when placing an order. 2. The bushing is in a free state when supplied. After being pressed into the pipe end, the dimensions d and 6 must be guaranteed. 3. Technical conditions shall comply with the provisions of JB1989--77. 90 Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.