a) A step shoulder pin has a shoulder, or stepped section, where the diameter changes. This creates a larger diameter at one end of the pin, forming a "step." Unlike threaded pins, these pins do not have threads along their length. They are smooth and cylindrical.
b) Step shoulder pins are used in applications where precise alignment, and secure positioning are required.
These hex head screws with two sides cutting are designed to simplify installation in various materials.
a.) It is a specialized screw designed for applications where a low-profile head and precise fastening are required.
b.) The groove under the collar serves various purposes, such as enhancing grip and accommodating additional components.
Special button head screw small collar cone point with generic hexalobular socket (6 lobe); Technical clealiness requirement, free of particle.