Editor's note version 86 fasteners (screw) the relevant national standards no longer contain fasteners weight part, according to the needs of the production and operation of the fastener industry, should be part of the fastener manufacturers, Shenyang Fasteners Institute Zhang Jinming with many years engaged in the production of technical fasteners test experience, to meet before the end of 2004 the fasteners the standard weight of the product, according to the actual production of theoretical weight formula, and with the help of computer functions more accurately the theoretical weight. Since its publication in 2005, the second journal has been well received by the readers. In order to meet the readers' requirements, this print will continue to be published for your reference.
In order to make a more intuitive understanding, the weight formula constitutes a deduction step. Some derivations do not do the final simplification (note by the author).
