Which of the following is true regarding the fitting of a torch hose?

Oxygen hoses are indeed fitted with right-hand threads, which is a crucial safety feature in gas welding and cutting operations. This design helps to prevent the accidental mixing of oxygen and acetylene hoses, as each gas type has its own designated thread pattern—oxygen being right-handed and acetylene being left-handed. The differing thread types ensure that the hoses cannot be incorrectly connected to the wrong gas, reducing the risk of dangerous situations when using torches.

The other points do not align with the standard practices regarding torch hoses. For instance, both hoses are not typically blue; rather, the oxygen hoses are usually colored green, and the acetylene hoses are typically red. The fittings themselves do not usually have left-hand threads for security; acetylene hoses specifically use left-hand threads. Lastly, hoses should not be interchangeable due to the differing properties of oxygen and acetylene, further emphasizing the importance of using the correct hoses with the appropriate fittings for safety and efficiency in welding and cutting tasks.