You can run quite a lot of cables through a 7/8 inch hole, but unless you protect and insulate the edges, that cabling is going to get nicked, scratched or even cut – especially if you are running the cables through a hole in the piece of metal. Those edges will be very sharp, nine out of ten times. Therefore, you need something to make them smooth. Otherwise – you will damage the wiring. Unfortunately for you, a 7/8 inch rubber grommet won’t be a good fit. You see, when you look up rubber grommets, and you look at the dimension, the number that usually pops up is the inner diameter, and that diameter is smaller than the hole you’re insulating. For a 7/8 inch hole, you will need a 5/8 inch rubber grommet because 5/8 stands for inner, not outer or groove diameter.

A 5/8 inch rubber grommet is one of the most universally sought after sizes when it comes to rubber hole grommets. It is somewhat of an industry standard to pierce appropriately-sized holes for a grommet like this. A grommet such as this one protects the cabling from accidental tears or cuts, but it also insulates the cut-out and makes it dust and/or water-resistant – depending on the application and the grommet itself. Additionally, a rubber grommet such as this one is safe for use in an electrically charged environment. A 5/8 inch rubber grommet is wide enough to run several standard cables through it safely.

Thanks to its universal nature, you can find our 5/8 inch rubber grommet in a variety of industries across plenty of different machines and products. Naturally, we can manufacture a grommet such as this one out of numerous rubber materials, including but not limited to nitrile and natural rubber. Generally, a customer would buy these rubber grommets in bulk.