50*1.56g螺紋環規螺紋止通規螺紋通止規50*1.56g螺紋環規螺紋止通規螺紋通止規50*1.56g螺紋環規螺紋止通規螺紋通止規50*1.56g螺紋環規螺紋止通規螺紋通止規50*1.56g螺紋環規螺紋止通規螺紋通止規50*1.56g螺紋環規螺紋止通規螺紋通止規50*1.56g螺紋環規螺紋止通規螺紋通止規50*1.56g螺紋環規螺紋止通規螺紋通止規50*1.56g螺紋環規螺紋止通規螺紋通止規50*1.56g螺紋環規螺紋止通規螺紋通止規50*1.56g螺紋環規螺紋止通規螺紋通止規50*1.56g螺紋環規螺紋止通規螺紋通止規50*1.56g螺紋環規螺紋止通規螺紋通止規50*1.56g螺紋環規螺紋止通規螺紋通止規50*1.56g螺紋環規螺紋止通規螺紋通止規50*1.56g螺紋環規螺紋止通規螺紋通止規50*1.56g螺紋環規螺紋止通規螺紋通止規50*1.56g螺紋環規螺紋止通規螺紋通止規50*1.56g螺紋環規螺紋止通規螺紋通止規50*1.56g螺紋環規螺紋止通規螺紋通止規50*1.56g螺紋環規螺紋止通規螺紋通止規50*1.56g螺紋環規螺紋止通規螺紋通止規50*1.56g螺紋環規螺紋止通規螺紋通止規50*1.56g螺紋環規螺紋止通規螺紋通止規50*1.56g螺紋環規螺紋止通規螺紋通止規50*1.56g螺紋環規螺紋止通規螺紋通止規50*1.56g螺紋環規螺紋止通規螺紋通止規50*1.56g螺紋環規螺紋止通規螺紋通止規50*1.56g螺紋環規螺紋止通規螺紋通止規50*1.56g螺紋環規螺紋止通規螺紋通止規50*1.56g螺紋環規螺紋止通規螺紋通止規50*1.56g螺紋環規螺紋止通規螺紋通止規50*1.56g螺紋環規螺紋止通規螺紋通止規50*1.56g螺紋環規螺紋止通規螺紋通止規50*1.56g螺紋環規螺紋止通規螺紋通止規50*1.56g螺紋環規螺紋止通規螺紋通止規50*1.56g螺紋環規螺紋止通規螺紋通止規50*1.56g螺紋環規螺紋止通規螺紋通止規50*1.56g螺紋環規螺紋止通規螺紋通止規50*1.56g螺紋環規螺紋止通規螺紋通止規50*1.56g螺紋環規螺紋止通規螺紋通止規50*1.56g螺紋環規螺紋止通規螺紋通止規50*1.56g螺紋環規螺紋止通規螺紋通止規50*1.56g螺紋環規螺紋止通規螺紋通止規50*1.56g螺紋環規螺紋止通規螺紋通止規