7 ME Screw Threads 32 TPI ME Screw Threads 32 TPI in 55 1 0.250 ME 1/4" ME 1/4" 32 external 32 TPI 0.2400 0.2231 0.2037 internal 32 TPI 0.2500 0.2300 0.2100 0.2130 0.2812 ME 9/32" ME 9/32" 32 external 32 TPI 0.2700 0.2534 0.2340 internal 32 TPI 0.2812 0.2612 0.2412 0.246 0.3125 ME 5/16" ME 5/16" 32 external 32 TPI 0.3031 0.2837 0.2643 internal 32 TPI 0.3125 0.2925 0.2725 0.277 0.375 ME 3/8" ME 3/8" 32 external 32 TPI 0.3638 0.3444 0.3250 internal 32 TPI 0.375 0.355 0.335 0.339 0.4375 ME 7/16" ME 7/16" 32 external 32 TPI 0.4200 0.4050 0.3856 internal 32 TPI 0.4375 0.4175 0.3975 0.404 0.5 ME 1/2" ME 1/2" 32 external 32 TPI 0.4800 0.4656 0.4462 internal 32 TPI 0.500 0.480 0.460 0.4688