Generally made in accordance with SAEJ512 and designed for use with copper, brass, aluminum and welded steel hydraulic tubing and flared like S.A.E. 45° flared fittings. A long nut is useful for excessive vibration.To make a connection, place the nut over the tubing, threaded end toward the tubing end to be flared. Flare tubing to create a 45° flare. The tube flare is clamped between nut and flare seat of body when screwed together. When assembly is tightened with a wrench, a leak-proof metal-to-metal joint is created. Recommended uses: copper, brass, aluminum and welded steel hydraulic tubing Working temperatures: -65°F to 250°F Material: brass (some steel) Application: fuel and oil lines, automotive brake, LP and natural gas connections