請教：ASME螺母標準B16.20,里面的機械螺母是什么意思？

互通有無

今天看ASME螺母標準B16.20,發(fā)現(xiàn)里面專門提到機械螺母，看了半天也沒有看明白機械螺母與普通螺母有什么區(qū)別，希望專業(yè)人士解惑，謝謝。

老方大竹

就是普通螺母，應該是翻譯的問題，看下原文。

大蘿卜

英文原版是：
1.1.1 This Standard is intended to cover the complete general and dimensional data for the various types of inch series square and hex nuts, including machine screw nuts and coupling nuts, recognized as American National Standard. Also included are appendices covering
gaging of slots in slotted nuts, wrench openings for nuts, and formulas on which dimensional data are based. It should be understood, however, that where questions arise concerning acceptance of product, thedimensions in the tables shall govern over recalculation by formula.

3.14 Grade and Manufacturer’s Identification Marking
Grade and manufacturer’s markings shall be applied as required by the applicable mechanical and performance standard except that markings are not required for the machine screw nuts per Tables 1-1 and 1-2.