Metric spring pins provide additional safety in component parts prone to frequent bumps or vibrations. Ordinary dowel pins or other metric fasteners can handle these disturbances by loosening and eventually wobbling from their shafts. However, spring pins generate some of their own forces to counteract these external forces. It actually applies pressure radially, pushing against the shaft wall to hold itself firmly in place.
There are two basic varieties of metric spring pins, coil spring pins and slotted spring pins. Coil spring pins are made of flat steel strip rolled into a cylinder, so if you look down from one end you will see a spiral pattern. How does this structure make it possible to apply radial forces outward into the shaft it is driven by? Well, the diameter of the pin is actually slightly larger than the shaft - the ends have to be rounded or chamfered to help the pin force in.
Slotted spring pins apply the same radial pressure as coil spring pins, just without the coil. The pins are rolled from sheet metal and look like a normal cylinder, but the edges of the rolls do not meet - a narrow longitudinal slot runs the length of the pin, so from one end it looks like A "C." This tiny gap gives the pin enough "resilience" to do the job.
Wenqi can provide torque tooling solutions for various industries such as aerospace, automotive, electronics, energy, medical, packaging, etc. Controlling torque is critical for companies to ensure the quality, safety and reliability of their products. Failure of an improperly tightened 3-cent fastener can lead to catastrophic or latent failure. Under-torqued fasteners can loosen, while over-torque can strip threaded fasteners or damage parts. The use of torque tools has become increasingly important for many companies to ensure proper torque is applied and to maintain gauge requirements associated with ISO 9001 quality standards.
