GB/T 4389-1995 Maximum dimensions of the head of double-ended open-end spanners, double-ended box spanners and combination spanners for assembling screws and nuts

GB/T 4389-1995 Assembly tools for screws and nuts - Maximum dimensions of the head of double-ended open-end spanners, double-ended box spanners and combination spanners GB/T4389-1995 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Assembly tool for screws and nuts-Open-end double-head engineers wrenches ,double-head box wrenches and combination wrenches-.Maximum outside dimensions of heads This standard is equivalent to the international standard ISO3318:1990 "Maximum outside dimensions of heads of assembly tool hands and combination wrenches for screws and nuts". 1 Subject content and scope of application
This standard specifies the maximum outside dimensions of the heads of open-end wrenches, box wrenches and combination wrenches. GB/T4389--1995
ISO 3318--1990
Replaces GB 4389--84
Double-ended open-end spanners and double-ended box-end spanners
This standard applies to open-end spanners, box-end spanners, combination spanners, strike open-end spanners and strike box-end spanners (numbered 1, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14 respectively) specified in GB/T4625. 2 Reference standards
GB/T 4625
Terms of assembly tools for screws and nuts
3 Maximum dimensions of the head
The maximum dimensions of the head are shown in the following figure and table: mm
Approved by the State Bureau of Technical Supervision on October 24, 1995b(max)
b2(mx)
Implementation on July 1, 1996
GB/T4389--1995
bi(max)
bzimax
GB/T4389—1995bZxz.net
bi(man)
Note: in the table, b1(m)=2.1S+7;be(mx)=1.5S+2. Additional remarks:
This standard was proposed by China Light Industry General Association and is under the jurisdiction of the Hardware Tools Standardization Center. ba(max)
This standard was drafted by the First Working Group of the Tool Hardware Sub-Technical Committee of the National Technical Committee for Standardization of Hardware Products. The main drafters of this standard are Lin Meide, Zhou Yanmou, and Gui Juan. This standard was first issued on May 14, 1984
This standard was second issued on October 24, 1995. mm
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