grade 12.9 socket head cap screws why should we increase R angle?

Why do some grade 12.9 socket head cap screws do not need to add R angle, and some hex socket cap head screws need to add R angle? R angle can be without it?

In fact, this mainly looks at the size of the head of the grade 12.9 socket head cap screws. Some screw heads are too large. If the R angle is not added, the head and the stem are separated when in use. Because the head of the screw can not withstand the torque, so you need to add an R angle under the head to protect the screw, so that when you twist, the protection under the head is not easy to break.

Therefore, the grade 12.9 socket head cap screws does not add the R angle, it depends on the size of the head. There are still some customers who don’t care about the size of the head. He has to add an R angle below the head.

If you want to customize grade 12.9 socket head cap screws, please send an email: annie.li@szsst88.com