safety screw meaning in English

安全转轮

Development and distribution of special safety screws
研制并销售专业安全螺丝
Safety screw for rim lock
用于锁块之包胶螺丝
After main rope is installed inside , install the component according to opening direction and then cover with safety , screw down safety screw properly
装入主绳后，按开口方向顺时针装入。再合上保险，将保险螺钉拧上不要太紧即可。
3 please screw down safety screw before installation , and screw down the component of pawl and rolling wheel anticlockwise according to opening direction of fingernail axis
3安装前请退出保险螺丝，按爪轴的开口方向将棘爪与滚轮组合件按反时针方向退出。