钢丝螺套简称丝套，又称（螺套、螺纹丝套、螺纹护套），是一种新型内螺纹紧固件，它是由高强度、高精度、高表面质量的耐蚀菱形截面的钢丝绕制而成，其形如弹簧，末端有一安装柄，利用安装柄借助于专用工具将其拧入基体特定的螺孔中，丝套的外表面靠弹力贴合在螺孔上，其内表面形成新的螺孔，用于拧入螺钉或螺栓，使螺钉或螺栓不直接与基体接触，保护了基体及螺钉，特别在铝、镁合金等低强度工程材料上应用可以明显提高强度和耐磨性，同时它还改善了螺纹的受力情况，使螺纹整体用力，提高了螺纹联接的强度。 也可用于修复磨损或损坏的内螺纹孔。 符号说明钢丝螺套安装螺孔及装配参数p.................螺矩N.................钢丝螺套在自由状态下的圈数d.................钢丝螺套公称直径（螺钉公称直径）Dz.................钢丝螺套在自由状态下的外径do.................钻孔时所选用的钻头直径L.................钢丝螺套公称长度L1.................钻孔深度L2.................钢丝螺套安装螺孔深度（丝套公称长度）L3.................不去除安装柄时螺钉最大拧入深度L4.................钢丝螺套安装后螺纹孔的实际有效长度公称直径(d)螺矩(P)公称长度圈数(N)自由状态下外径DZ钻头直径(do)千件质量(kg)L×dL120.41d22.92.62～2.7620.0220.41.5d34.72.62～2.7620.0320.42d46.52.62～2.7620.052.50.451d2.53.63.3～3.52.60.042.50.451.5d3.85.93.3～3.52.60.062.50.452d58.23.3～3.52.60.092.50.452.5d6.310.53.3～3.52.60.112.50.453d7.512.83.3～3.52.60.1330.51d34.23.8～43.10.0730.51.5d4.56.83.8～43.10.130.52d69.43.8～43.10.1430.52.5d7.5123.8～43.10.1730.53d914.63.8～43.10.213.50.61d3.544.55～4.753.70.113.50.61.5d5.36.44.55～4.753.70.173.50.62d78.94.55～4.753.70.223.50.62.5d8.811.44.55～4.753.70.283.50.63d10.513.94.55～4.753.70.3440.71d445.05～5.254.20.1740.71.5d66.65.05～5.254.20.2640.72d89.15.05～5.254.20.3440.72.5d1011.75.05～5.254.20.4340.73d1214.25.05～5.254.20.5150.81d54.46.35～6.65.20.3150.81.5d7.57.16.35～6.65.20.4650.82d109.96.35～6.65.20.6150.82.5d12.512.66.35～6.65.20.7650.83d1515.36.35～6.65.20.92611d64.37.6～7.856.30.55611.5d96.97.6～7.856.30.83612d129.67.6～7.856.31.1612.5d1512.27.6～7.856.31.38613d1814.97.6～7.856.31.65711d75.28.65～8.97.30.75711.5d10.58.38.65～8.97.31.12712d1411.58.65～8.97.31.5712.5d17.514.68.65～8.97.31.8781.251d84.89.85～10.18.31.2281.251.5d127.79.85～10.18.31.8381.252d1610.69.85～10.18.32.4581.252.5d2013.59.85～10.18.33.0681.253d2416.59.85～10.18.33.67811d869.85～10.18.30.98811.5d129.69.85～10.18.31.47812d1613.19.85～10.18.31.96812.5d2016.79.85～10.18.32.45101.51d10512.1～12.510.42.29101.51.5d158.112.1～12.510.43.44101.52d2011.212.1～12.510.44.59101.52.5d2514.212.1～12.510.45.73101.53d3017.312.1～12.510.46.88101.251d106.112.1～12.510.31.91101.251.5d159.712.1～12.510.32.87101.252d2013.312.1～12.510.33.82101.252.5d2516.912.1～12.510.34.78