NPTF的精選

Ontheotherhand,NPTFthreadsaredesignedtoensurethatsufficientcrushingoftheentirethreadformwilltakeplacetoproduceamechanicalseal.另一方面，NPTF螺紋的設計用於保*在整個牙形上產生足夠的變形以生成這種機械密封...