Shoulder bolt, also known as a shoulder screw or stripper bolt, is a mechanical fastener with a shoulder that acts as a pin joint to connect two parts
Shoulder bolts have three main sections: the head, the shoulder, and the threads. The shoulder is the cylindrical middle section that's wider than the screw section but narrower than the head.
The shoulder's diameter change allows it to be tightened against the part it's screwed into, while the unthreaded shoulder allows the bolted material to rotate around the screw axis
Shoulder bolts are used in many industries, including aerospace, consumer products, and home appliances.