直螺纹连接时套筒长度滚轧直螺纹钢筋连接接头，HRB335级钢筋.Φ1640±0.5Φ1845±0.5Φ2050±0.5Φ2255±0.5Φ2560±0.5Φ2865±0.5Φ3290±0.5Φ4095±0.5滚轧直螺纹钢筋连接接头，HRB400级钢筋.Φ1645±0.5Φ1850±0.5Φ2055±0.5Φ2260±0.5Φ2565±0.5Φ2870±0.5Φ3280±0.5Φ3690±0.5Φ4095±0.5§表1钢筋端头螺纹滚轧加工尺寸（mm）公称直径Φ16Φ18Φ20Φ22Φ25Φ28Φ32Φ36Φ40螺纹代号M17?M19?M21?M23?M26?.5M29?.5M33?M37?M41?螺纹长度222426283035404045中径15.70117.70119.70121.70124.37627.37631.05135.05139.051小径14.83516.83518.83520.83523.29426.29429.75233.75237.752表2连接套规格尺寸（mm）公称直径Φ16Φ18Φ20Φ22Φ25Φ28Φ32Φ36Φ40螺纹外径283031343744495459螺纹内径1517192123.526.5303438接套长度454852556065708090表3连接套螺纹规格尺寸（mm）螺纹钢筋公称直径Φ16Φ1820Φ22Φ25Φ28Φ32Φ36Φ40滚轧直螺纹代号M17M19M21M23M26M29M33M37M41螺距22222.52.5333中径15.70117.70119.70121.70124.37627.37631.05135.05139.051小径牙型角60?60?60?60?60?60?60?60?60?公称直径Φ16Φ18Φ20Φ22Φ25Φ28Φ32Φ36Φ40滚轧直螺纹代号M17M19M21M23M26M29M33M37M41螺距22222.52.5333中径15.70117.70119.70121.70124.37627.37631.05135.05139.051小径14.83516.83518.83520.83523.29426.29429.75233.75237.752牙型角
