--- product_id: 49639598 title: ".125'' (1/8\" Actual) Buna-N O-Ring Cord Stock, 70A Durometer, 0.125\" Thickness, 10' Piece, Black" brand: "mr o-ring" price: "$32.37" currency: USD in_stock: true reviews_count: 8 url: https://www.desertcart.us/products/49639598-125-1-8-actual-buna-n-o-ring-cord-stock store_origin: US region: United States of America --- # 70A Durometer -40°F to 212°F Made in USA .125'' (1/8" Actual) Buna-N O-Ring Cord Stock, 70A Durometer, 0.125" Thickness, 10' Piece, Black **Brand:** mr o-ring **Price:** $32.37 **Availability:** ✅ In Stock ## Summary > 🔩 Seal the Deal with Confidence! ## Quick Answers - **What is this?** .125'' (1/8" Actual) Buna-N O-Ring Cord Stock, 70A Durometer, 0.125" Thickness, 10' Piece, Black by mr o-ring - **How much does it cost?** $32.37 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/49639598-125-1-8-actual-buna-n-o-ring-cord-stock) ## Best For - mr o-ring enthusiasts ## Why This Product - Trusted mr o-ring brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Customizable Lengths:** Available in various lengths to suit your specific project needs, ensuring a perfect fit every time. - • **Durable Buna-N Material:** Crafted from high-quality Buna-N, providing exceptional wear resistance and longevity. - • **Proudly Made in the USA:** Support local manufacturing while enjoying top-notch quality and performance. - • **Versatile Fluid Compatibility:** Engineered for a variety of fluids and hydrocarbons, ensuring reliability in diverse applications. - • **Extreme Temperature Resilience:** Withstands temperatures from -40°F to 212°F, perfect for both hot and cold environments. ## Overview This .125'' Buna-N O-Ring Cord Stock is a high-performance sealing solution designed for a wide range of fluids and temperatures. With a durometer rating of 70A, it offers excellent durability and flexibility, making it ideal for various industrial applications. Proudly made in the USA, this 10' piece is available in multiple cross sections to meet your specific needs. ## Description This O-ring cord is made of Buna-nitrile (also called Buna-N), round in cross-section, has a durometer of 70A, and is designed for use in a wide variety of sealing applications.Buna-nitrile can have high tensile strength, resistance to abrasion, tear, and compression set resistance. It is acceptable for temperature applications between -30 degrees F (-34 degrees C) to 250 degrees F (121 degrees C). It is compatible for use with petroleum, HFA, HFB, and HFC fluids, vegetable oil, alcohol, acids, and aliphatic hydrocarbons. Buna-nitrile is vulnerable to acetone, ethers, esters, ozone, sunlight, and weathering, and should therefore not be used in ozone-generating electric motors, welding equipment, or in applications with exposure to UV light.This O-ring cord has a shore durometer of 70A. Shore durometer is the hardness of a material, and its resistance to permanent indentation. A higher durometer value indicates greater resistance to indentation on a scale of 0 to 100, with 100 indicating no indentation. ## Features - O-Ring Cord made of Buna-N (Nitrile, NBR) for use with a variety of fluids and hydrocarbons - Durometer (hardness) of 70A - For use across a wide temperature range from -40 degrees F (-40 degrees C) to 212 degrees F (100 degrees C) - Made in the U.S.A. - Available in various cross sections and lengths ## Product Details - **Material:** Nitrile Rubber - **Nominal Inside Diameter:** 0.13 Inches - **Item Diameter:** 0.3 Centimeters - **Brand:** Mr O-Ring - **Color:** Black ## Images ![.125'' (1/8" Actual) Buna-N O-Ring Cord Stock, 70A Durometer, 0.125" Thickness, 10' Piece, Black - Image 1](https://m.media-amazon.com/images/I/712mL2CVl4L.jpg) ## Available Options This product comes in different **Size** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Great Value O-Ring Cord Stock! *by C***7 on July 21, 2025* This is a good value for 100' of .103" o-ring cord stock! It works perfectly in our CNC'd, dovetail cut, valve cover o-ring grooves. Fits perfectly and on a roll that is easy to store on our assembly shelf. We use this in our customers cylinder heads and when they do come back in for service there is shrinkage, but that is to be expected with a rubber material. Cuts easily with an exact-o knife. ### ⭐⭐⭐⭐⭐ Worked great *by A***X on May 22, 2025* Worked great making a new plenum oring gasket for my supercharger ### ⭐⭐⭐⭐⭐ In stock when I most need it! *by S***Y on July 23, 2025* Mr. O-Ring always seems to have what we need in his "store" and it is just as described and for the best price around! I don't normally leave reviews but figured maybe this would give someone hesitant to buy from him the positive feedback they need to make a decision! We use this size o-ring cord in some of our cylinder heads (obviously we use multiple sizes) after we CNC a groove using a dovetail cutter. ## Frequently Bought Together - .125'' (1/8" Actual) Buna-N O-Ring Cord Stock, 70A Durometer, 0.125" Thickness, 10' Piece, Black - 3M Scotch-Weld Plastic & Rubber Instant Adhesive PR40, Clear, 20 Gram Bottle - .070'' (1/16" Nominal) Buna-N O-Ring Cord Stock, 70A Durometer, 0.070" Thickness, 10' Piece, Black --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.us/products/49639598-125-1-8-actual-buna-n-o-ring-cord-stock](https://www.desertcart.us/products/49639598-125-1-8-actual-buna-n-o-ring-cord-stock) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-05-19*