NPTF的精选

Ontheotherhand,NPTFthreadsaredesignedtoensurethatsufficientcrushingoftheentirethreadformwilltakeplacetoproduceamechanicalseal.另一方面，NPTF螺纹的设计用于保*在整个牙形上产生足够的变形以生成这种机械密封...