Oxy-fuel cutting torches are paired with compatible tips for preheating and cutting ferrous metals. Oxy-fuel torch handles are paired with compatible tips for heating, welding, brazing, or soldering. Oxy-fuel cutting attachments are paired with compatible torch handles and cutting tips for preheating and cutting ferrous metals. Oxy-fuel flashback arrestors and check valves are mounted at the torch or regulator to prevent explosions within fuel lines or reverse gas flow, respectively. Motor-driven oxy-fuel cutting machines support and guide compatible torches for straight-line or circle cutting.