Fully threaded hex bolts are also known as tap bolts, are used in machinery and construction.
Can be used with a nut, or in a tapped hole.
Stainless steel hex bolts are partially threaded and can be used with a nut or in a tapped hole.
The bolts are tightened with a wrench, and are usually used with appropriate hex nuts and washers.
Screws outer hex bolts is very sharp,clean and accurate.And the compact thread is not easy to out of shape and slid in the process of rolling.