Grade AMERICAN UN (U-TYPE) EXTERNAL - FULL PROFILE (UN, UNC, UNF, UNEF) ANSI B1, 3M-1986 CLASS 2A U-Type Application: General Industry Designation ThreadType Hand Insert IC TPI L R X YType(inch)(inch)(inch)(inch)(inch) 27UERL3UN External Neutral U-Type 0.625 3 1.063 0.045 0.098 0.539 22UERL4UN External Neutral U-Type 0.500 4 0.866 0.033 0.079 0.433 22UERL4.5UN External Neutral U-Type 0.500 4.5 0.866 0.030 0.079 0.433 =P =M =K =N =S =H 1201