Pre embedded nut insert nut embedded nut
It declines with the increase of times of direct assembling bolt knocked-down. But it can still reach that of nylon inbuilt nut after knocked-down 8 to 9 times.
直接拧入式螺杆的极限抗拔力随着拆装次数的增多而下降,但是,当拆装次数为8-9时,极限抗拔力仍然可达到尼龙预埋螺母的水平。
—— 给力词典精选