---
product_id: 18711953
title: "331 Silicone O-Ring, 70A Durometer, Red, 2-1/4\" ID, 2-5/8\" OD, 3/16\" Width (Pack of 5)"
brand: "mr o-ring"
price: "128 Lei"
currency: RON
in_stock: true
reviews_count: 8
url: https://www.desertcart.ro/products/18711953-331-silicone-o-ring-70a-durometer-red-2-1-4
store_origin: RO
region: Romania
---

# Aerospace Standard AS568A 70A Durometer -65°F to 450°F 331 Silicone O-Ring, 70A Durometer, Red, 2-1/4" ID, 2-5/8" OD, 3/16" Width (Pack of 5)

**Brand:** mr o-ring
**Price:** 128 Lei
**Availability:** ✅ In Stock

## Summary

> 🔒 Seal the Deal with Confidence!

## Quick Answers

- **What is this?** 331 Silicone O-Ring, 70A Durometer, Red, 2-1/4" ID, 2-5/8" OD, 3/16" Width (Pack of 5) by mr o-ring
- **How much does it cost?** 128 Lei with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ro](https://www.desertcart.ro/products/18711953-331-silicone-o-ring-70a-durometer-red-2-1-4)

## 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 Hardness:** Featuring a durometer rating of 70A, these O-rings offer excellent resistance to penetration, ensuring long-lasting durability.
- • **Precision Sealing:** With a round cross-section, these O-rings provide a superior seal between cylindrical surfaces, preventing leaks and enhancing performance.
- • **Aerospace Quality Assurance:** Compliant with Aerospace Standard AS568A, these O-rings guarantee top-tier quality and reliability for professional applications.
- • **Extreme Temperature Resilience:** Engineered to perform in extreme conditions, these O-rings maintain their integrity from -65°F to 450°F, ensuring reliability in any environment.
- • **Versatile Chemical Compatibility:** Crafted from high-quality silicone, these O-rings are designed to withstand a variety of chemicals and fluids, making them perfect for diverse applications.

## Overview

The 331 Silicone O-Ring pack includes five high-performance silicone O-rings, featuring a durometer of 70A, designed for a wide range of chemicals and fluids. With a temperature tolerance from -65°F to 450°F and compliance with Aerospace Standard AS568A, these O-rings ensure a reliable seal in various demanding environments.

## Description

This silicone O-ring is red in color, round in shape, has a durometer of 7OA, and is designed for use in a wide variety of sealing applications. Silicone is acceptable for temperature applications between -65 degrees F (-54 degrees C) to 450 degrees F (232 degrees C). It has good resistance to ozone, weather, detergent, salt water, engine and transmission oil, non-petroleum brake fluid, hydraulic fluids that resist fire, vegetable and animal oils, and high molecular weight chlorinated aromatic hydrocarbons. Silicone is vulnerable to mechanical wear and tear, water and steam over 250 degrees F (121 degrees C), aromatic hydrocarbons (benzene), chlorinated hydrocarbons (trichloroethylene), acids and bases, and hydrocarbon fuels.O-rings commonly provide a pressure and fluid seal between cylindrically shaped, overlapping mating surfaces and are commonly seen in engines, faucets, flanges, valves, and various cylinders. They are circular in shape, with a round cross section and a hole in the center, similar to a doughnut. O-rings are available in a number of sizes, and can be ordered based on required nominal inside diameter (ID), outer diameter (OD), and cross-sectional (CS) diameter.  This silicone O-ring 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.  This silicone O-ring meets standards defined by Aerospace Standard AS568A, which is the Aerospace Size Standard for O-rings.

## Features

- Made of silicone for use with a variety of chemicals and fluids
- Can be used across a wide temperature range from -65 degrees F (-54 degrees C) to 450 degrees F (232 degrees C)
- Round in cross-section to provide a seal between cylindrical overlapping surfaces
- Durometer (hardness) of 70A for resistance to penetration
- Meets standards defined by Aerospace Standard AS568A

## Images

![331 Silicone O-Ring, 70A Durometer, Red, 2-1/4" ID, 2-5/8" OD, 3/16" Width (Pack of 5) - Image 1](https://m.media-amazon.com/images/I/71Fbh-mFhNL.jpg)
![331 Silicone O-Ring, 70A Durometer, Red, 2-1/4" ID, 2-5/8" OD, 3/16" Width (Pack of 5) - Image 2](https://m.media-amazon.com/images/I/51bid7qjm5L.jpg)

## Customer Reviews

### ⭐⭐ 2.0 out of 5 stars







  
  
    Package was already open in mailbox
  

*by K***R on Reviewed in the United States on April 16, 2020*

When I pulled the amazon package from my locked mailbox I noticed it was open in not one but two spots. The first was at the top and look like a faulty seal, the second however looks like someone used a box cutter on it and is on the side of the package. The product inside was fine and everything was inside. I just find it really odd it was open already in not one but two different locations.

### ⭐⭐⭐⭐ 4.0 out of 5 stars







  
  
    Very durable.
  

*by D***W on Reviewed in the United States on December 28, 2019*

Used it with a strap on harness.

### ⭐⭐⭐⭐⭐ 5.0 out of 5 stars







  
  
    Exactly as described!
  

*by S***S on Reviewed in the United States on May 27, 2020*

Exactly as described.

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**Shop now:** [https://www.desertcart.ro/products/18711953-331-silicone-o-ring-70a-durometer-red-2-1-4](https://www.desertcart.ro/products/18711953-331-silicone-o-ring-70a-durometer-red-2-1-4)

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*Product available on Desertcart Romania*
*Store origin: RO*
*Last updated: 2026-03-01*