3/8 inch rubber grommet has inside diameter of 9.52500 millimeters or 0.9525 centimeters if you use metric system. It can happen to get confused with all the different sizes that one rubber grommet has, although it is a very small thing. When we say that a 3/8 inch rubber grommet has a 3/8 inch or 0.95 cm inner diameter, it is the diameter of the hole on the rubber grommet, not the diameter of the whole grommet. The diameter of the whole rubber grommet is the outside diameter, while the groove diameter is the diameter that is between the inside and outside diameter.

Next up is the choice of material for you 3/8 inch rubber grommet. Let’s start with the natural rubber that has high tear and tennis strength, so grommets made of natural rubber are very hard to destroy. Rubber is also an excellent insulator. Neoprene is a type of rubber that stands out in terms of heat resistance, as well as weather resistance, while ozone hardly affects the aging products made of Neoprene. If you need oil resistance, then look no further than Buna-N. If your rubber grommet will be in contact with oil, choose Buna-N. If you want a transparent grommet that is eco-friendly, go with silicone. Silicone is a material that is often used to make grommets, as well as many other things. There are other materials, for example FKM, which stands out for its high chemical stability.

When it comes to using rubber grommets, you need to be creative. You can always use them for something that is not their primary function. Also, consider being different colors, to make it easier to recognize different holes. While this may not sound so important now, it can help you significantly when you want to locate wire or cable.