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 最大问题是ISO螺孔默认配用的牙型不完全是国标螺纹指定的 
错              对 M22X3      M22X2.5 M50X4      M50X3 M56X6.5   M56X5.5 M75X6      M75X4 M125X8    M125X6 M130X8    M130X6 M140X8    M140X6 M150X8    M150X6 M160X8    M160X6 M170X8    M170X6 M180X8    M180X6 M190X8    M190X6 M200X8    M200X6 M210X8    M210X6 M220X8    M220X6 M240X8    M240X6 M250X8    M250X6 M260X8    M260X6 M280X8    M280X6 M300X8    M300X6
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