The threads on fittings for acetylene hoses are designed for what purpose?

The threads on fittings for acetylene hoses are specifically designed to prevent incorrect connections. This is crucial because acetylene is highly flammable and can be dangerous if mixed with incorrect gases or connected to the wrong equipment. The unique threading pattern ensures that only compatible fittings can be joined together, thus reducing the risk of accidents and enhancing safety when using acetylene in welding and cutting applications. Ensuring proper connections helps maintain safe working environments and prevents potential hazards that could arise from improper use.

While other factors, such as grip, pressure resistance, and leakage prevention, are important for fittings and hoses in general, the primary purpose of specialized threads in this context is the prevention of incorrect connections.