---
product_id: 154795133
title: ".250'' (1/4\" Actual) Buna-N O-Ring Cord Stock"
brand: "mr o-ring"
price: "€ 39.22"
currency: EUR
in_stock: true
reviews_count: 13
category: "Mr O Ring"
url: https://www.desertcart.fi/products/154795133-250-1-4-actual-buna-n-o-ring-cord-stock
store_origin: FI
region: Finland
---

# Wide temp range -40°F to 212°F 0.25'' precise diameter Made in USA quality .250'' (1/4" Actual) Buna-N O-Ring Cord Stock

**Brand:** mr o-ring
**Price:** € 39.22
**Availability:** ✅ In Stock

## Summary

> 🔧 Seal your success with precision and power!

## Quick Answers

- **What is this?** .250'' (1/4" Actual) Buna-N O-Ring Cord Stock by mr o-ring
- **How much does it cost?** € 39.22 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/154795133-250-1-4-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

- • **Durable & Resilient:** 70A durometer hardness delivers superior abrasion, tear, and compression set resistance.
- • **Proudly American-Made:** Crafted in the USA for trusted quality and consistent performance.
- • **Precision Fit, Every Time:** Exact 0.25'' diameter ensures seamless sealing in critical applications.
- • **Built to Withstand Extremes:** Operates reliably from freezing -40°F to scorching 212°F without compromise.
- • **Versatile Chemical Compatibility:** Resistant to petroleum, alcohols, acids & hydrocarbons for diverse industrial uses.

## Overview

This .250'' Buna-N O-Ring Cord Stock offers a perfect balance of durability and flexibility with a 70A hardness rating. Engineered for a broad temperature range (-40°F to 212°F) and compatibility with various fluids including petroleum and acids, it’s the go-to sealing solution for professionals demanding reliable, American-made quality in industrial and automotive applications.

## 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.

Review: Great Value O-Ring Cord Stock! - 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.
Review: Great Product with Multiple Applications - This 1/16" O-Ring Cord Stock worked great to fill the gap between a new side mirror and the mirror bezel on my classic car. As a result, the mirror looks very professionally done!

## 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

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00QVB5A0W |
| Best Sellers Rank | #22,749 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #32 in O-Rings |
| Brand | Mr O-Ring |
| Color | Black |
| Date First Available | December 10, 2014 |
| Is Discontinued By Manufacturer | No |
| Item Diameter | 0.25 Inches |
| Item Weight | 4.8 ounces |
| Item model number | AZ-N70.250/10 |
| Manufacturer | Mr O-Ring |
| Material | Nitrile Rubber |
| Nominal Inside Diameter | 0.28 Inches |
| Nominal Outside Diameter | 0.28 Inches |
| Unit Count | 1.0 Count |

## Product Details

- **Brand:** Mr O-Ring
- **Color:** Black
- **Item Diameter:** 0.25 Inches
- **Material:** Nitrile Rubber
- **Nominal Inside Diameter:** 0.28 Inches

## Images

![.250'' (1/4" Actual) Buna-N O-Ring Cord Stock - Image 1](https://m.media-amazon.com/images/I/41yWJ+zm3BL.jpg)
![.250'' (1/4" Actual) Buna-N O-Ring Cord Stock - Image 2](https://m.media-amazon.com/images/I/712mL2CVl4L.jpg)

## 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.

### ⭐⭐⭐⭐⭐ Great Product with Multiple Applications
*by S***P on March 7, 2025*

This 1/16" O-Ring Cord Stock worked great to fill the gap between a new side mirror and the mirror bezel on my classic car. As a result, the mirror looks very professionally done!

### ⭐⭐⭐⭐⭐ Make you own oring this buna_n holds up fine
*by C***2 on November 21, 2025*

Needed to make an oring i could not find for a 20-yr old floor jack. received this product I cut it to size then super glued it, then put it in not one but 2 floor jacks a 3 ton and 4-ton model . the oring has held up for 6 months with on and off use . with floor jacks so many are replaced due to a oring going bad and no one sales it without big bucks. yep, saved me from a 600.00 replacement cost im tickled

## Frequently Bought Together

- .250'' (1/4" Actual) Buna-N O-Ring Cord Stock
- 3M Scotch-Weld Plastic & Rubber Instant Adhesive PR40, Clear, 20 Gram Bottle
- .250'' (1/4" Actual) Silicone O-Ring Cord Stock, 70A Durometer, 10' Piece, Red

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**Shop now:** [https://www.desertcart.fi/products/154795133-250-1-4-actual-buna-n-o-ring-cord-stock](https://www.desertcart.fi/products/154795133-250-1-4-actual-buna-n-o-ring-cord-stock)

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*Product available on Desertcart Finland*
*Store origin: FI*
*Last updated: 2026-03-07*