A grommet is a ring or edge strip inserted into a hole through thin material, typically a sheet of textile fabric, sheet metal or composite of carbon fiber, wood or honeycomb. Grommets are generally flared or collared on each side to keep them in place, and are often made of metal, plastic, or rubber. They may be used to prevent tearing or abrasion of the pierced material or protection from abrasion of the insulation on the wire, cable, line being routed through the penetration, and to cover sharp edges of the piercing, or all of the above.
Here at MDI, we create many types of rubber grommets for many different industries. A very common example is our Duckbill Grommet (left), used in the automotive industry. These applications age well, and are resistant to Ozone and water, making them very trustworthy in your car!
Another common example of a grommet is the one used on power cords. Power cord grommets (below) are used to locate and separate wire harness through a housing wall.
Can you spot any grommets in your everyday life? They are more common than you think!