螺丝扣 meaning in English

coupling unit
thread
turnbuckle

Turnbuckles for overhead power lines
架空电力线的松紧螺丝扣
Specification for locking clips for turnbuckles of control cables - dimensions
操纵钢索的松紧螺丝扣的锁紧卡子的规范.尺寸
Aerospace series ; locking clips for turnbuckles of control cables ; dimensions
航空航天.操纵钢索松紧螺丝扣的固定夹子.尺寸
Aerospace ; threaded control cable ends and turnbarrels ; technical specification ; inactive for new design
航空航天.带螺纹的操纵钢缆端部和松紧螺丝扣.技术规
Aerospace series ; control cable fittings and turnbarrels ; technical specification ; german version en 2569 : 1991
航空航天系列.操纵钢缆接头和松紧螺丝扣.技术规范