气瓶专用锥形螺纹丝锥的英文

special taper thread tafor gas cylinder

• 气瓶:    air bottle; gas cy ...
• 专用:    special use; for a ...
• 锥形:    taper; cone; cone- ...
• 螺纹:    screw thread; flig ...
• 丝锥:    tap; screwtap