Steel 7/16"-24 IFM thread nuts for 1/4" brake line tubing when double flared to 45°.
Steel 3/8"-24 IFM thread nuts for 3/16" brake line when double flared to 45°.Brake System Builder's Tip (Link)
Steel 3/8"-24 IFM thread nuts for 3/16" brake line when double flared to 45°.