"Size","UNC (TPI)","UNF (TPI)","Stress area UNC (in²)"
"1/4″ (6.35)","20","28","0.0318"
"5/16″ (7.94)","18","24","0.0524"
"3/8″ (9.52)","16","24","0.0775"
"7/16″ (11.11)","14","20","0.1063"
"1/2″ (12.70)","13","20","0.1419"
"9/16″ (14.29)","12","18","0.182"
"5/8″ (15.88)","11","18","0.226"
"3/4″ (19.05)","10","16","0.334"
"7/8″ (22.22)","9","14","0.462"
"1″ (25.40)","8","12","0.606"
"Reference only — confirm against drawing. ASME B1.1. REL India"