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Hardness - Durometer Chart

Durometer (r) an instrument for measuring the indentation hardness of rubber.

The hardness of rubber compounds is measured by the Shore A durometer; the higher the durometer, the harder the compound. 70-durometer hardness should be used whenever possible as it offers the best combination of properties for most O-Rings applications.

Durometer Shore A scale is a type of measurement for rubber material hardness. The rubber durometer chart below gives you an idea of the rubber hardness that you want for your application. Generally, most rubber materials fall under the rubber durometer scale of Shore A. If you need a rubber or O-ring durometer that feels like a running shoe sole, review our rubber hardness chart below, then pick Shore 70A. A rubber durometer of Shore 70A is the most commonly chosen material hardness for all applications.

  • Duro 20A = Rubber Band
  • Duro 40A = Pencil Eraser
  • Duro 60A = Car Tire Tread
  • Duro 70A* = Running Shoe Sole
  • Duro 80A = Leather Belt
  • Duro 100A = Shopping Cart Wheel

*Most common durometer

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The O-ring Store offers great deals on a large selection of AS568 Buna-N O-rings (Nitrile), Metric Buna-N O-rings (Nitrile), Standard O-rings, Metric O-rings, Viton O-rings, Viton Extreme O-rings, in many compounds and colors. We are the best source for common and not so common o-rings. Buy o-rings online, fax 208-413-3719 or call 208-413-6377. The O-ring Store can save you hundreds of dollars and deliver quicker than most o-ring suppliers world wide! Plus convenient, flat fee shipping from FedEx and the US Postal Service.


Welcome to The O-ring Store, were you can find a huge selection of o-rings, hydraulic seals, o-ring kits and accessories. We have factory and custom made repair kits to provide you with o-rings and seals to fix everything from paintball guns, pools, sprayers, air tools to large hydraulic cylinders. In addition to our inventory we use many factories, suppliers, and even competitors to get what you need, when you need it, were you need it, at an agreed upon price with no surprises. We compete with O-rings West, Marco Rubber, O-rings USA, Apple Rubber, Parker, MSC Industrial Supply, North Coast Seal, Orings and More, and many more that make us better. We make getting your O-rings easy!

We are continuing to expanding our selection of Hydraulic Seals, Oil Seals, O-ring Kits, rebuild kits and O-rings.