M5~M16
Avecs is a product that a steel plate and a bolt are caulked bonding both together.
Compare using welding method, it is easy to control production due to the small variations in production accuracy. Also, by using caulking method, it enables high strength bolts that is weak to high temperature, to other materials.
Eliminate welding method. Apply where high strength bolts are needed to be brought together with other materials.