FMSI > Tube Nuts > Standard Steel Invert Flare Tube Nuts > Item # 3442 FMSIFMSI Tube NutsTube Nuts Standard Steel Invert Flare Tube Nuts Standard Steel Invert Flare Tube Nuts Item # 3442 Item # 3442, 3/8" x 5/8" - 18 Standard Steel Invert Flare Tube Nut (Long) 34423/8" x 5/8" - 18 Standard Steel Invert Flare Tube Nut (Long) Request Information Email This Page Download PDF Download PDF Printable Page Downloads FE The Officail Guide Book -TUBE NUTS - Ver2.pdf /Asset/3442.png /Asset/3442.png Close Window - For 3/8" tube - Invert flare with 5/8" - 18 thread (long)- 5/8" hex head Unit of Measure Imperial Metric Both Specifications Tube Size N/A 3/8 in Thread Diameter N/A 5/8 in Threads per Inch N/A 18 T.P.I Hex Size N/A 5/8 in AGS N/A PSR-013 Packaging N/A SP(10) HP(2) Package Type N/A Barrel Units Per Package N/A 1