Insert nut is designed for rapid installing into thermo - plastics by means of ultrasound . its two opposite helical knurl bands provide a combination of high torque and pulling out resistance 壓入式螺母通過加熱或利用超音波可快速安裝到熱塑性塑料中,它的兩道相反旋向的壓花帶可提供較高的抗扭轉(zhuǎn)和抗拉拔能力