The Series 6420 Straight Female ORB x Female NPT Rigid adapters in carbon steel are durable fittings designed to connect two different thread styles: ORB (O-Ring Boss) and NPT (National Pipe Tapered). The ORB connection features a straight thread with an O-ring that forms a reliable seal when compressed into a chamfered surface on the female port, ensuring leak prevention in medium and high-pressure hydraulic systems. The NPT connection uses tapered threads that provide a metal-to-metal seal for fluid and gas transfer. These adapters are ideal for single-assembly applications, and over-tightening should be avoided. A thread sealant is recommended for optimal performance. Made from carbon steel, these adapters are perfect for high-pressure applications, offering strength and reliability in various industrial systems.