setscrew

1. Loosen setscrew 4. a large hemispherical brass or copper drum with a drumhead that can be tuned by adjusting the tension on it.
   拧松线张力杆固定螺丝4进行调整。带有可调整张力鼓膜的半球形铜鼓。
2. Design of the Injection Mould for the Biomaterial Setscrew
   生物材料固定螺钉注射模设计

noun

1. a screw (often without a head) that fits into the boss or hub of a wheel or cam etc. and prevents motion of the part relative to the shaft on which it is mounted

2. a screw that is used to adjust the tension on a spring