UNEFThread (USA) UNF Thread (USA) UNM Thread (USA) UNR Thread (USA) UNS Thread (USA) 8-UN Thread (USA) 12-UN Thread (USA) 16-UN Thread (USA) 1 3/16" - 8-UN: 1.1875: 30.162: 27.200: 8: 3.175: 1 1/4" - 8-UN: 1.2500: 31.750: 28.800: 8: 3.175: 1 5/16" - 8-UN: 1.3125: 33.337: 30.300: 8: 3.175: 1 3/8" - 8-UN: 1.3750: 34.925: 31.900: 8:
UNEFScrew Threads per ANSI B1.1. UNEF = Unified National Extra Fine. This is one of three graded series: UNC (Unified National Corase); UNF (Unified National Fine); and UNEF (Unified National Extra Fine). The Nominal Major Diameter and Threads-per-inch (Pitch) are defined by ANSI/ASME B1.1 and are the choices for the customary
38 - 16 16-UN : Basic Thread Dimensions (Pitch, minor & major diameters, depth, lead), Tolerance range for all applicable classes and much more * Permisable values for thread Class 2B # Description Value (Inch) VValue (mm) D 1: Minor Diameter: 0.307 - 0.321: 7.798 - 8.153: D 2: (UNC/UNF/UNEF) National Pipe (NPT) Dryseal Pipe (BPTF
GeneralNote: All dimensions expressed in inches. Supplements: Thread calculators and charts; ASME UN screw thread calculator; Reference: ASME B1.1-2003, Unified Inch Screw Threads (UN and UNR Thread Form)
. 928 134 219 136 785 799 694 170
3 4 16 unf 2b thread dimensions
