An inadequately torqued fastener can vibrate or work loose; conversely, if the tension is too high, the fastener can snap or strip its threads.
一个不适当的扭矩紧固件可能会振动或松掉，相反，如果张力过高，紧固件可能会拉断或剥掉其连线。
2
Loess, stone, cotton & plastic snapfastener.
黄土，石头，棉，塑料按扣。
3
Side pocket with a snapfastener can be opened and closed easily to get credit cards. Large bills pocket with a zipper give you fully sense of security.