我要查找我提的问题答案

卡尺卡出外径，拿牙规测出牙数，按照下表对照，
螺纹最好测量外径

管螺纹 外螺纹大径 内螺纹小径
R1/8"-28 9.728 8.566
R1/4"-19 13.157 11.445
R3/8"-19 16.663 14.951
R1/2"-14 20.956 18.632
(R5/8"-14) 22.912 20.588
R3/4"-14 26.442 24.119
R1"-11 33.250 30.292
R1.1/4"-11 41.912 38.954
R1.1/2"-11 47.805 44.847
R1.3/4"-11 53.748 50.791
R2"-11 59.616 56.659

管螺纹 外螺纹大径 内螺纹小径
G1/8"-28 9.728 8.386
G1/4"-19 13.157 11.445
G3/8"-19 15.862 14.95
G1/2"-14 20.955 18.531
(G5/8"-14) 22.911 20.587
G3/4"-14 26.441 24.117
G1"-11 33.249 30.291
G1.1/4"-11 41.91 36.962
G1.1/2"-11 47.803 44.845
G1.3/4"-11 53.746 50.788
G2"-11 59.614 56.556
管螺纹 外径 内径
Z1/8"-27 10.272 8.766
Z1/4"-18 13.572 11.314
Z3/8"-18 17.055 14.797
Z1/2"-14 21.223 18.321