Used on a/c replacement port. 3a thread class right-hand 0.469" thread length hexagon head style 1.061" grip length 28 thread quantity per inch bolt-stabilized, non-magnetic, cres one cotter pin hole in head; 0.046 inch dia drill unf thread series
3a thread class hexagon extended washer head style 0.248" hole diameter 24 thread quantity per inch cadmium or nickel surface treated unjf thread series
Used on 2420-01-526-3399 wheeled industrial tractor. right-hand 6.0mm thread length pan head style metric coarse machine screw zinc screw surface treated m thread series
Used on 1940-01-526-0770 inboard engine bridge erection boat. right-hand 18-8 stainless steel hex head cap screw .750 diameter threads; 16 threads per inch, class 2a