内板锁紧螺钉螺纹
internal lock plate screw thread
弹簧加载风扇皮带张紧轮
spring loaded fan belt tightener pulley
风扇带张紧轮
fan belt tightener pulley
空心拉力螺钉张力带钢丝
cannulated lag screws with a tension band
Figure-eight wiring through two parallel annulated compression screws
张紧轮臂支架总成
idler arm sprocket assembly