内六角紧定螺钉
一端带有内孔、无头的螺钉。该内孔通常为内六角，用于拧紧。内六角紧定螺钉用于将谐振器相互连接。
Socket set screw
A screw with a socket in one end and without a head. The socket is typically a hex which is used for tightening. Socket set screws are used to join resonators together.
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| Figure 1. Socket set screw |
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