A.2d0 B.3d0 C.1.5d0 D.2.5d0
A.1/10;5mm B.1/16;5mm C.1/16;8mm D.1/15;5mm
A.承壓面;緊固 B.剪切面;防松 C.剪切面;加壓 D.摩擦面;加壓