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knurl n.1.(樹木等的)硬節,瘤。2.小的隆起物;金屬表面上...

knurr

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和抗拉拔能力

Threaded bush with knurl 帶滾花的螺紋襯套