Smith Equipment SC50-4 Cutting Tip, 2-Piece, Series: SC50, Size: #4, Flow Rate: Oxygen: 315 scfh (Cutting), Propane: 17 - 80 scfh, Natural Gas: 45 - 75 scfh (Preheat), Pressure: Propane: 10 psig, Natural Gas: 6 psig (Preheat), Oxygen: 54 psig Regulator/50 psig Torch (Cutting), Flame Type: Heavy Preheat, Gas Service: Natural Gas, Propane, Cutting Thickness: 4 Inch, Cutting Width: 1/8 Inch, Cutting Speed: 7 in./min.