McMaster-Carr offers assortments of oil and chemical resistant O-rings in a variety of sizes and materials including nitrile, fluorocarbon, silicone, and ethylene propylene. The O-rings meet military specifications and come in kits of 25, 50, 100, or 300 pieces. The assortments allow you to stock up on frequently used sizes. The O-rings resist fuels, oils, and solvents. Their high quality materials and precise sizing help prevent leaks. The O-rings can handle temperatures up to 400°F.