Our Flanged Fitting is made from versatile Delrin. Our versatile Delrin nut resists cross threading or loosening during use delivering excellent dimensional stability It includes a 316 stainless steel washer. This fitting is compatible with a 1/4-28 Flat-Bottom port geometry. Our Delrin fitting has a 5/16″ Square Head style and is for is for 1/8″OD Tubing. It comes is black. Brochure