"21/2螺距是多少"...21/2螺距是多少
"1/2-20螺距"...1/2-20螺距
"20的螺距"...20的螺距
"20mm螺距"...20mm螺距
"螺距25.4"...螺距25.4
"22标准螺距"...22标准螺距
"1/4-20螺距"...1/4-20螺距
"螺距2.309"...螺距2.309
"螺距11g"...螺距11g
"螺距2.5mm"...螺距2.5mm
