---
product_id: 659113397
title: "139 Buna-N O-Ring, 70A Durometer, Black, 2-3/16\" ID, 2-3/8\" OD, 3/32\" Width (Pack of 100)"
brand: "mr o-ring"
price: "€ 76.74"
currency: EUR
in_stock: true
url: https://www.desertcart.be/products/659113397-139-buna-n-o-ring-70a-durometer-black-2-3
store_origin: BE
region: Belgium
---

# AS568A aerospace standard certified Wide temp range -30°F to 250°F Buna-N resists fluids & hydrocarbons 139 Buna-N O-Ring, 70A Durometer, Black, 2-3/16" ID, 2-3/8" OD, 3/32" Width (Pack of 100)

**Brand:** mr o-ring
**Price:** € 76.74
**Availability:** ✅ In Stock

## Summary

> 🔩 Seal the deal with confidence—where precision meets durability!

## Quick Answers

- **What is this?** 139 Buna-N O-Ring, 70A Durometer, Black, 2-3/16" ID, 2-3/8" OD, 3/32" Width (Pack of 100) by mr o-ring
- **How much does it cost?** € 76.74 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.be](https://www.desertcart.be/products/659113397-139-buna-n-o-ring-70a-durometer-black-2-3)

## 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

- • **Premium Buna-N Material:** Crafted from durable nitrile rubber, optimized for resistance against oils, fuels, and hydrocarbons.
- • **Precision Fit Guaranteed:** Exact 2-3/16" ID and 2-3/8" OD dimensions for seamless sealing on cylindrical surfaces.
- • **Bulk Pack for Professionals:** 100-piece set designed to keep your projects running without interruption—never run out on the job.
- • **Optimal Hardness for Durability:** 70A durometer hardness balances flexibility and penetration resistance for long-lasting performance.
- • **Engineered for Extreme Conditions:** Operates flawlessly from freezing -30°F to scorching 250°F, ensuring reliability in any environment.

## Overview

This pack of 100 black Buna-N O-rings (Model 139) features a 70A durometer hardness and meets aerospace AS568A standards. Designed for a 2-3/16" ID and 2-3/8" OD, these nitrile rubber seals excel across a broad temperature range (-30°F to 250°F) and resist a variety of fluids and hydrocarbons, making them the go-to choice for professional-grade sealing solutions.

## 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

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Asin | B000FMUQPW |
| Brand Name | Mr O-Ring |
| Colour | Black |
| Customer Reviews | 5.0 5.0 out of 5 stars (3) 5.0 out of 5 stars |
| Item Diameter | 2.38 Inches |
| Manufacturer | Small Parts, Inc |
| Material Type | Nitrile Rubber |
| Model Number | 139 |
| Number Of Items | 100 |
| Number Of Pieces | 100 |
| Part Number | AZ-N70139/100 |

## Images

![139 Buna-N O-Ring, 70A Durometer, Black, 2-3/16" ID, 2-3/8" OD, 3/32" Width (Pack of 100) - Image 1](https://m.media-amazon.com/images/I/81VuBT35OeL.jpg)
![139 Buna-N O-Ring, 70A Durometer, Black, 2-3/16" ID, 2-3/8" OD, 3/32" Width (Pack of 100) - Image 2](https://m.media-amazon.com/images/I/51bid7qjm5L.jpg)

---

## 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.be/products/659113397-139-buna-n-o-ring-70a-durometer-black-2-3](https://www.desertcart.be/products/659113397-139-buna-n-o-ring-70a-durometer-black-2-3)

---

*Product available on Desertcart Belgium*
*Store origin: BE*
*Last updated: 2026-08-22*