FMSI > Tube Nuts > Standard Steel Invert Flare Tube Nuts > Item # 3399 FMSIFMSI Tube NutsTube Nuts Standard Steel Invert Flare Tube Nuts Standard Steel Invert Flare Tube Nuts Item # 3399 Item # 3399, 7/16" x 11/16" - 18 Standard Steel Invert Flare Tube Nut 33997/16" x 11/16" - 18 Standard Steel Invert Flare Tube Nut Request Information Email This Page Download PDF Download PDF Printable Page Downloads FE The Officail Guide Book -TUBE NUTS - Ver2.pdf /Asset/3399.png /Asset/3399.png Close Window - For 7/16" tube - Invert flare with 11/16" - 18 thread - 11/16" hex head Unit of Measure Imperial Metric Both Specifications Tube Size N/A 7/16 in Thread Diameter N/A 11/16 in Threads per Inch N/A 18 T.P.I Hex Size N/A 11/16 in Packaging N/A SP(4) HP(1) Package Type N/A Barrel Units Per Package N/A 1