Quotes (0) FMSI > Brake System > Hardware > Tube Nuts > Female Tube Nuts > Item # 41S-6 (Formerly 3431) FMSIFMSI Brake SystemBrake System HardwareHardware Tube NutsTube Nuts Female Tube NutsFemale Tube Nuts Item # 41S-6 (Formerly 3431) Item # 41S-6 (Formerly 3431), Female Tube Nuts 41S-6 (Formerly 3431)Female Tube Nuts Request Information Email This Page Download PDF Download PDF Printable Page Close Window Unit of Measure Imperial Metric Both Specifications Tube Size N/A 3/8 in Thread Diameter N/A 5/8 in Thread Pitch N/A 18 T.P.I