Our Series 9042 Straight Male BSPT x Female NPT hydraulic adapters, made from carbon steel, are designed to connect components using British Standard Pipe Tapered (BSPT) male threads and National Pipe Taper (NPT) female threads. While both BSPT and NPT threads are similar in function, they differ in thread pitch, outer diameter, and thread form, so it’s important to use thread sealants for a secure, leak-proof connection. These adapters feature a captive seal made by using metal-to-metal angled surfaces or a combination of metal and an O-ring for added security. The BSPT male side is compatible with both BSPP and BSPT female ports, while the female NPT side uses the U.S. standard tapered thread. Ideal for fluid and gas transfer applications, these adapters offer a reliable and long-lasting solution. Thread sizes are expressed in fractional dimensions, with BSPT 1/4-19 designated as R 1/4.