توضیح فارسی
مهره كوچكتر از مهره اصلی كه برای قفل كردن مهره اصلی بكار می رود.
Description
a jam nut is a low profile type of nut, typically half as tall as a standard nut. it is commonly used as a type of locknut, where it is "jammed" up against a standard nut to lock the two in place. it is also used in situations where a standard nut would n