锁紧件 meaning in English

locking piece
retaining member

Transformers ; locking pieces for air vent and drain for oil
变压器.通气孔和排油孔的锁紧件
Touch and close fasteners - cycling procedure for subsequent testing
粘贴锁紧件.跟踪检验用循环程序
Touch and close fasteners - behaviour of slit selvedges ; german version en 1415 : 1996
粘附锁紧件.切边性能
Touch and close fasteners - determination of curvature ; german version en 1416 : 1996
粘附锁紧件.弯曲性测定