---
product_id: 14541983
title: "109 Buna-N O-Ring, 70A Durometer, Black, 5/16\" ID, 1/2\" OD, 3/32\" Width (Pack of 100)"
brand: "mr o-ring"
price: "€ 12.09"
currency: EUR
in_stock: true
url: https://www.desertcart.pt/products/14541983-109-buna-n-o-ring-70a-durometer-black-5-16
store_origin: PT
region: Portugal
---

# Aerospace Standard AS568A 70A Durometer -30°F to 250°F 109 Buna-N O-Ring, 70A Durometer, Black, 5/16" ID, 1/2" OD, 3/32" Width (Pack of 100)

**Brand:** mr o-ring
**Price:** € 12.09
**Availability:** ✅ In Stock

## Summary

> 🔒 Seal the Deal with Confidence!

## Quick Answers

- **What is this?** 109 Buna-N O-Ring, 70A Durometer, Black, 5/16" ID, 1/2" OD, 3/32" Width (Pack of 100) by mr o-ring
- **How much does it cost?** € 12.09 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/14541983-109-buna-n-o-ring-70a-durometer-black-5-16)

## 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

- • **Bulk Value Pack:** Comes in a pack of 100, ensuring you’re always prepared for any sealing challenge.
- • **Durable Hardness:** 70A durometer rating provides exceptional resistance to penetration and wear.
- • **Precision Engineering:** Round cross-section design guarantees a perfect seal between cylindrical surfaces.
- • **Versatile Fluid Compatibility:** Crafted from high-quality Buna-N, perfect for various fluids and hydrocarbons.
- • **Extreme Temperature Resilience:** Withstands temperatures from -30°F to 250°F, ensuring reliability in diverse environments.

## Overview

The 109 Buna-N O-Ring is a high-performance sealing solution designed for a wide range of fluids and hydrocarbons. With a durometer rating of 70A, it offers excellent resistance to penetration and wear, while its temperature range of -30°F to 250°F ensures versatility in various applications. This product meets the stringent standards of Aerospace Standard AS568A, making it a reliable choice for professionals seeking quality and durability.

## Description

109 Buna-N O-Ring, 70A Durometer, Black, 5/16" ID, 1/2" OD, 3/32" Width (Pack of 100)

## Features

- Made of Buna-nitrile (also called Buna-N) for use with a variety of fluids and hydrocarbons
- Can be used across a wide temperature range from -30 degrees F (-34 degrees C) to 250 degrees F (121 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

## Product Details

- **Material:** Nitrile Rubber
- **Nominal Inside Diameter:** 0.3 Inches
- **Item Diameter:** 0.51 Inches
- **Brand:** Mr O-Ring
- **Color:** Black

## Images

![109 Buna-N O-Ring, 70A Durometer, Black, 5/16" ID, 1/2" OD, 3/32" Width (Pack of 100) - Image 1](https://m.media-amazon.com/images/I/81VuBT35OeL.jpg)
![109 Buna-N O-Ring, 70A Durometer, Black, 5/16" ID, 1/2" OD, 3/32" Width (Pack of 100) - Image 2](https://m.media-amazon.com/images/I/51bid7qjm5L.jpg)

## Frequently Bought Together

- 109 Buna-N O-Ring, 70A Durometer, Black, 5/16" ID, 1/2" OD, 3/32" Width (Pack of 100)
- 111 Buna-N O-Ring, 70A Durometer, Black, 7/16" ID, 5/8" OD, 3/32" Width (Pack of 100)
- 010 Buna-N O-Ring, 90A Durometer, Round, Black, 1/4" ID, 3/8" OD, 1/16" Width (Pack of 100)

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*Product available on Desertcart Portugal*
*Store origin: PT*
*Last updated: 2026-01-23*