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1、六角沉孔头螺丝JIS B1176（1988） * JIS B1176（1976）的沉头及螺丝孔的尺寸sk-厂dk bkl螺丝称号（d）M3M4M5M6M8M10M12M14M16M20M24M30ds3.3456810121416202430ds3.44.55.56.6911141618222633dk5.578.5101316182124303645dk6.589.5111417.5202326323948k3456810121416202430k2.73.64.65.57.49.21112.814.518.522.528k3.34.45.46.58.610.81315.217.521.52
2、5.532螺丝称号（d）M3M4M5M6M8M10M12(M14)M16M20M24M30螺牙节距（p）0.50.70.811.251.51.75222.533.5b参考182022242832364044526072最大（基准呎吋）5.578.5101316182124303645最大5.687.228.7210.2213.2716.2718.2721.3324.3330.3336.3945.39dk最小5.326.788.289.7812.7315.7317.7320.6723.6729.6735.6144.61da最大3.64.75.76.89.211.213.715.717.722.4
3、26.433.4最大（基准呎吋）3456810121416202430ds最小2.863.824.825.827.789.7811.7313.7315.7319.6723.6729.67最大（基准呎吋）3456810121416202430k最小2.863.824.825.707.649.6411.5713.5715.5719.4823.4829.48r最小0.10.20.20.250.40.40.60.60.60.80.81基准呎吋2.534568101214171922最小2.523.024.025.026.028.02510.02512.03214.03217.05019.06522.0
4、65s最大1栏2.5803.0804.0955.1406.1408.17510.11512.21214.21217.23019.27522.275(1)2 栏2.5603.0804.0955.0956.0958.11510.11512.14214.14217.23019.27522.275t最小1.322.5345688101215.5（1）S（最大）之第1栏，适用于强度区分8.8及10.9者及形状区分A2-50,A2-70者，第2栏适用于强度区分12.9者，可依供需双方协 议，将强度区分12.9者适用第一栏螺丝称号M20以上的S（最大），可适用于全部强度区分及性情区分者.（2）头部侧面应施予直条刻纹等压在刻纹JIS B0591（金花刻纹），此时,dk（最大）为本表所示，*记号的数值，不需压花刻纹者，由 订购人径行指定此时的dk（最大）为本表所示附*记号的数值.
