---
product_id: 38397472
title: "Captain O-Ring - ORB BOSS Hydraulic Fitting SAE 900 O-Ring Seal Kit (Buna-N 70-255 Piece Kit, 12 Sizes)"
brand: "captain o-ring"
price: "€ 81.34"
currency: EUR
in_stock: true
reviews_count: 8
category: "Captain O Ring"
url: https://www.desertcart.sk/products/38397472-captain-o-ring-orb-boss-hydraulic-fitting-sae-900-o
store_origin: SK
region: Slovakia
---

# 12 sorted sizes in durable case -40°F to 250°F temp range 255 precision o-rings Captain O-Ring - ORB BOSS Hydraulic Fitting SAE 900 O-Ring Seal Kit (Buna-N 70-255 Piece Kit, 12 Sizes)

**Brand:** captain o-ring
**Price:** € 81.34
**Availability:** ✅ In Stock

## Summary

> 🔧 Seal like a boss — never get caught without the perfect o-ring!

## Quick Answers

- **What is this?** Captain O-Ring - ORB BOSS Hydraulic Fitting SAE 900 O-Ring Seal Kit (Buna-N 70-255 Piece Kit, 12 Sizes) by captain o-ring
- **How much does it cost?** € 81.34 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/38397472-captain-o-ring-orb-boss-hydraulic-fitting-sae-900-o)

## Best For

- captain o-ring enthusiasts

## Why This Product

- Trusted captain o-ring brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **All-in-One Size Range:** Includes all 12 essential BOSS/ORB sizes (-904 to -916) for versatile hydraulic fittings
- • **Proudly Made in the USA:** Quality you can trust from Captain O-Ring LLC, backed by warranty and rave reviews
- • **Organized for Efficiency:** Robust, compartmentalized case with size chart keeps your workflow seamless and mess-free
- • **Wide Temperature Resilience:** Operates flawlessly from freezing -40°F up to scorching 250°F environments
- • **Complete Hydraulic Seal Solution:** 255 premium Buna-N 70 durometer o-rings for unmatched oil and fluid resistance

## Overview

The Captain O-Ring BOSS Hydraulic SAE 900 O-Ring Seal Kit features 255 high-quality Buna-N 70 durometer o-rings, covering 12 common BOSS/ORB sizes. Designed for hydraulic fittings, it offers excellent oil and fluid resistance with a wide service temperature range from -40°F to 250°F. Packaged in a durable, compartmentalized case with a size chart, this USA-assembled kit ensures quick identification and reliable sealing performance for professional-grade hydraulic maintenance.

## Description

Product description Captain O-Ring - BOSS Hydraulic SAE 900 O-Ring Seal Kit (Buna-N 70-255 Piece Kit) Includes high quality BN70 (Buna Nitrile 70 durometer) o-rings - the most common o-ring material Includes all sizes between -904 to -916 (255 total o-rings) Used in sealing straight thread tube fittings (BOSS Type) in hydraulic equipment Captain O-Ring's 255 Piece BOSS Hydraulic BN70 O-Ring Kit includes 12 sizes and 255 total o-rings. The kit includes o-ring sizes 904, 905, 906, 907, 908, 909, 910, 911, 912, 913, 914, 916 which are used to seal straight thread tube fittings (BOSS Type) found in hydraulic equipment. This kit contains o-rings made of Buna Nitrile (70 durometer) material, also known as BN70 or NBR70 . BN70 is the most common and most practical o-ring material used in BOSS seal applications due to its resistance to many hydraulic fluids and its flexibility/sealability in low temperatures. The included size chart on the front of the kit makes sizing up o-rings quick and effortless. O-Rings are conveniently sorted by size in a shatterproof Flambeau divider box. Includes The Following O-Ring Sizes and Quantities -904 (35 pieces) -905 (35 pieces) -906 (30 pieces) -907 (25 pieces) -908 (25 pieces) -909 (20 pieces) -910 (20 pieces) -911 (15 pieces) -912 (15 pieces) -913 (15 pieces) -914 (10 pieces) -916 (10 pieces) What to expect This item includes 255 O-Rings in a Flambeau plastic divider case with "Captain O-Ring" branded packaging. Assembled in the USA!

Review: Great alternative for spending a ton more at a local hydraulic shop. - Exactly what I needed for ORB hydraulics. As others have mentioned the case is great quality compared to others.
Review: Good variety - Good selection at a reasonable price. Haven't had much use thus far but it's good knowing there's a stock of various o-rings onhand if anything arises.

## Features

- Includes high quality BN70 (Buna Nitrile 70 durometer) o-rings - the most common o-ring material for hydraulic ORB/BOSS fittings due to it’s excellent sealing ability and resistance to oils and hydraulic fluid. Service temperature of -40F to 250F.
- Includes all 12 BOSS/ORB o-ring sizes between -904 to -916. 255 total o-rings.
- Used in sealing straight thread tube fittings (ORB / O-Ring Boss Type) in hydraulic equipment
- O-Rings are conveniently sorted by size in individual compartments within the divider box with a convenient o-ring size chart included on the kit to quickly and easily size up and identify the o-ring you need.
- Manufactured and Warrantied by Captain O-Ring LLC. Proudly assembled in the USA!

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01BE5J23K |
| Best Sellers Rank | #28,849 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #48 in O-Rings |
| Brand | Captain O-Ring |
| Brand Name | Captain O-Ring |
| Customer Reviews | 4.7 out of 5 stars 173 Reviews |
| Manufacturer | Captain O-Ring LLC |
| Material | Buna-N Rubber |
| Material Type | Buna-N Rubber |
| Model | BOSS255-BN70 |
| Number of Pieces | 255 |
| Part Number | BOSSKIT-255pcBN70 |
| Set Name | 255 Piece ORB / BOSS Hydraulic BN70 O-Ring Kit |
| Temperature Range | 2.5E+2 Degrees Fahrenheit |
| UPC | 722589526572 |
| Unit Count | 1 Count |

## Product Details

- **Brand:** Captain O-Ring
- **Manufacturer:** Captain O-Ring LLC
- **Material:** Buna-N Rubber
- **Temperature Range:** 2.5E+2 Degrees Fahrenheit
- **UPC:** 722589526572

## Images

![Captain O-Ring - ORB BOSS Hydraulic Fitting SAE 900 O-Ring Seal Kit (Buna-N 70-255 Piece Kit, 12 Sizes) - Image 1](https://m.media-amazon.com/images/I/61McUTf2fgL.jpg)
![Captain O-Ring - ORB BOSS Hydraulic Fitting SAE 900 O-Ring Seal Kit (Buna-N 70-255 Piece Kit, 12 Sizes) - Image 2](https://m.media-amazon.com/images/I/61IYRERvRSL.jpg)
![Captain O-Ring - ORB BOSS Hydraulic Fitting SAE 900 O-Ring Seal Kit (Buna-N 70-255 Piece Kit, 12 Sizes) - Image 3](https://m.media-amazon.com/images/I/717g8TlgbJL.jpg)
![Captain O-Ring - ORB BOSS Hydraulic Fitting SAE 900 O-Ring Seal Kit (Buna-N 70-255 Piece Kit, 12 Sizes) - Image 4](https://m.media-amazon.com/images/I/81kE6acXRoL.jpg)
![Captain O-Ring - ORB BOSS Hydraulic Fitting SAE 900 O-Ring Seal Kit (Buna-N 70-255 Piece Kit, 12 Sizes) - Image 5](https://m.media-amazon.com/images/I/71BO9vN4TzL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great alternative for spending a ton more at a local hydraulic shop.
*by C***N on March 27, 2026*

Exactly what I needed for ORB hydraulics. As others have mentioned the case is great quality compared to others.

### ⭐⭐⭐⭐⭐ Good variety
*by M***N on May 10, 2026*

Good selection at a reasonable price. Haven't had much use thus far but it's good knowing there's a stock of various o-rings onhand if anything arises.

### ⭐⭐⭐⭐ recommend
*by J***N on December 5, 2025*

decent selection

## Frequently Bought Together

- Captain O-Ring - ORB BOSS Hydraulic Fitting SAE 900 O-Ring Seal Kit (Buna-N 70-255 Piece Kit, 12 Sizes)
- Captain O-Ring ORS/ORFS (for Flat Face Fittings) Hydraulic O-Ring Seal Kit (Buna 90 / BN90-180 Piece Kit)
- Captain O-Ring Flange Seal (SAE Code 61/62) Hydraulic O-Ring Seal Kit (Buna 90 / BN90-55 Piece Kit)

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*Product available on Desertcart Slovakia*
*Store origin: SK*
*Last updated: 2026-05-27*