The oxygen hose thread direction is:

The oxygen hose thread direction is:

• A. Left-hand
• B. Coarse
• C. Tapered
• D. Right-hand

Answer: (D)

Gas hose connections for oxygen are right-hand threaded, so you tighten the connection by turning clockwise. This standard makes the fittings predictable and secure, and it helps prevent accidental cross-connection with other gas lines that could be dangerous in welding work. Using a different thread direction would create confusion and increase the risk of leaks or mixing gases. The description of the thread form (coarse or tapered) doesn’t tell you how to tighten it; the important safety detail here is that the connection uses right-hand threading.

Gas hose connections for oxygen are right-hand threaded, so you tighten the connection by turning clockwise. This standard makes the fittings predictable and secure, and it helps prevent accidental cross-connection with other gas lines that could be dangerous in welding work. Using a different thread direction would create confusion and increase the risk of leaks or mixing gases. The description of the thread form (coarse or tapered) doesn’t tell you how to tighten it; the important safety detail here is that the connection uses right-hand threading.