公制内六角圆柱头 螺钉 Hex socket head cap screws 执行标准：执行标准：GB70.1、、ISO4762、、DIN912材质：碳钢、合金钢、不锈钢 单位：mm头部直径 d2 max.规格d1不滚花滚花头部厚度K max.内六角对边S内六角深度t min.螺纹长度（参考）bM1.633.141.61.50.715M23.83.9821.5116M2.54.54.682.521.117M35.55.6832.51.318M477.2243220M58.58.72542.522M61010.2265324M81313.2786428M101616.27108532M121818.271210636M142121.331412740M162424.331614844M182727.331814948M203030.3320171052M223333.3922171156M243636.3924191260M274040.39271913.566M304545.39302215.572M365454.4636271984于 2021.5.23 上传。