Thumb screw
01
親ねじ, 蝶ねじ
a type of fastener designed with a large, knurled or textured head that can be easily tightened or loosened by hand without the need for additional tools
例
You can adjust the height of the chair by turning the thumb screw on the side.
椅子の高さは、横にある親ねじを回して調整できます。



























