A.10~17mm B.17~480mm C.20~480mm D.17~280mm
A.10°~15° B.10°~18° C.15°~30° D.18°~30°
A.2 B.3 C.5 D.6
A.牙型角为60°的三角形螺纹 B.牙型角为30°的三角形螺纹 C.牙型角为60°的梯形螺纹 D.牙型角为30°的梯形螺纹