Shop Series 60 High Pressure Tapered Threaded Fittings for Seamless Tubing Connections. Made of High Strength 316 Stainless Steel, these fittings offer a Working Pressure of 4137bar and Operating Temperature Range from -252°C to 649°C. Available for 1/4in, 3/8in, and 9/16in OD seamless tubing. Ensure a secure and reliable connection for your high-pressure applications.