3390 - Acetylene Adapter - B-Size Male (LH) to 1/4 Inch NPT Male Brass Fitting

Precision Brass Adapter for Acetylene Gas Systems

The ESB3390 Brass Adapter is a critical component for professional welding and cutting setups, specifically designed to bridge the gap between standard pipe threads and welding-specific gas connections. Manufactured from high-quality, free-machining brass, this adapter ensures a leak-free and secure seal, which is paramount when handling volatile fuel gases like Acetylene. The unit features a 1/4-inch National Pipe Thread (NPT) Male connection on one end and a B-Size (CGA 022/023) Male connection on the other. Crucially, because this fitting is designated for Acetylene service, the B-Size threads are cut with a Left-Hand (LH) orientation (9/16"-18 LH), adhering to CGA safety standards to prevent accidental connection to Oxygen or inert gas lines.

In industrial MRO and fabrication environments, versatility in gas distribution is key. This adapter is frequently employed to connect regulators, flowmeters, or hoses to manifolds and hard-piped systems. The 1/4" NPT side allows for integration into a wide array of standard industrial valves, blocks, and piping, while the B-Size side accepts standard welding hoses and fittings. The brass material is chosen not only for its machinability but also for its non-sparking properties and resistance to atmospheric corrosion, ensuring a long service life even in harsh shop environments.

Proper installation of gas fittings is essential for safety. The hex-shaped body of this adapter provides ample surface area for a standard wrench, allowing technicians to apply the necessary torque without rounding off the fitting. When installing the NPT end, the use of an appropriate thread sealant or PTFE tape rated for gas service is recommended to ensure a gas-tight seal. The B-Size mechanical connection relies on the mating geometry of the hose nut and nipple; therefore, the precision machining of the sealing surface on this adapter is vital for preventing leaks. This component meets or exceeds standard pressure ratings for oxy-fuel welding and cutting operations.

Whether you are building a custom gas manifold, repairing a regulator, or adapting a machine's gas inlet, this brass adapter provides the reliability and safety compliance required for professional Acetylene applications. Its robust design withstands the rigors of daily use, vibration, and thermal fluctuation common in welding operations.