7 ME Screw Threads 40 TPI ME Screw Threads 40 TPI in 55 1 0.1250 ME 1/8" ME 1/8" 40 external 40 TPI 0.1213 0.1057 0.0902 internal 40 TPI 0.1250 0.1090 0.0930 0.0938 0.1562 ME 5/32" ME 5/32" 40 external 40 TPI 0.1515 0.1365 0.1214 internal 40 TPI 0.1562 0.1407 0.1252 0.1285 0.1875 ME 3/16" ME 3/16" 40 external 40 TPI 0.1819 0.1664 0.1508 internal 40 TPI 0.1875 0.1715 0.1555 0.1570 0.2188 ME 7/32" ME 7/32" 40 external 40 TPI 0.2122 0.1967 0.1812 internal 40 TPI 0.2188 0.2028 0.11868 0.1890 0.2500 ME 1/4" ME 1/4" 40 external 40 TPI 0.2425 0.2270 0.2115 internal 40 TPI 0.2500 0.2340 0.2180 0.2210 0.2812 ME 9/32" ME 9/32" 40 external 40 TPI 0.2728 0.2572 0.2417 internal 40 TPI 0.2812 0.2652 0.2492 0.257 0.3125 ME 5/16" ME 5/16" 40 external 40 TPI 0.3031 0.2876 0.2721 internal 40 TPI 0.3125 0.2965 0.2805 0.290 0.375 ME 3/8" ME 3/8" 40 external 40 TPI 0.3638 0.3482 0.3327 internal 40 TPI 0.3750 0.3590 0.3430 0.348 0.4375 ME 7/16" ME 7/16" 40 external 40 TPI 0.4244 0.4089 0.3933 internal 40 TPI 0.4375 0.4215 0.4055 0.413 0.500 ME 1/2" ME 1/2" 40 external 40 TPI 0.485 0.4695 0.454 internal 40 TPI 0.5 0.4840 0.468 0.4688