Used on 6740-01-193-2018 printer-processor,photographic film. 2b thread class right-hand 1.250" overall length 2.000" overall width 6 thread quantity per inch two holes in coupling ring for safety wire special acme thread series
2a thread class right-hand 2.062" overall length 10 thread quantity per inch 20-20 wire size socket contacts in lieu of 20-22 double stub thread series