---
product_id: 38397472
title: "ORB BOSS Hydraulic Fitting SAE 900 O-Ring Seal Kit (Buna-N 70-255 Piece Kit, 12 Sizes)"
brand: "captain o-ring"
price: "HK$622"
currency: HKD
in_stock: true
reviews_count: 8
category: "Captain O Ring"
url: https://www.desertcart.hk/products/38397472-orb-boss-hydraulic-fitting-sae-900-o-ring-seal-kit
store_origin: HK
region: Hong Kong
---

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

**Brand:** captain o-ring
**Price:** HK$622
**Availability:** ✅ In Stock

## Summary

> 🔧 Seal your success with precision and confidence!

## Quick Answers

- **What is this?** 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?** HK$622 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/products/38397472-orb-boss-hydraulic-fitting-sae-900-o-ring-seal-kit)

## 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

- • **Proudly USA-Made Quality:** Manufactured and backed by Captain O-Ring LLC for guaranteed reliability.
- • **Smart Organization System:** Compact, sturdy case with size chart keeps your workflow seamless and mess-free.
- • **Premium Buna-N 70 Material:** Durable, oil-resistant sealing trusted by pros for hydraulic fittings.
- • **Wide Temperature Tolerance:** Reliable performance from freezing -40°F up to scorching 250°F.
- • **Comprehensive 255-Piece Kit:** All essential BOSS/ORB sizes from -904 to -916 for every hydraulic need.

## Overview

The Captain O-Ring BOSS Hydraulic SAE 900 O-Ring Seal Kit features 255 high-quality Buna-N 70 durometer O-rings in 12 common BOSS/ORB sizes, designed for superior sealing in hydraulic fittings. With a robust temperature range of -40°F to 250°F and a durable, organized case, this USA-made kit ensures professional-grade reliability and convenience for hydraulic maintenance and repairs.

## Description

Captain O-Ring - ORB BOSS Hydraulic Fitting SAE 900 O-Ring Seal Kit (Buna-N 70-255 Piece Kit, 12 Sizes): desertcart.com: Industrial & Scientific

Review: Nice set! - Nice set of o-rings in an awesome case. That's usually the problem with these kits, the case is junk and falls apart and your stuff ends up on the ground. Not this kit. Has all the common sizes and feel like quality o-rings.
Review: Great assortment - Great set, fit very well and I guess only time will tell how long they last. Large assortment of sizes and all fit my machine so far. Great value for the price. Case is nice to keep them organized and it is not flimsy.

## 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 | #56,647 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #121 in O-Rings |
| Brand | Captain O-Ring |
| Date First Available | February 2, 2016 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 8 ounces |
| Item model number | BOSS255-BN70 |
| Manufacturer | Captain O-Ring LLC |
| Material | Buna-N Rubber |
| Number of Pieces | 255 |
| Package Dimensions | 9.02 x 4.92 x 1.38 inches |
| 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

![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)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Nice set!
*by D***6 on June 6, 2021*

Nice set of o-rings in an awesome case. That's usually the problem with these kits, the case is junk and falls apart and your stuff ends up on the ground. Not this kit. Has all the common sizes and feel like quality o-rings.

### ⭐⭐⭐⭐⭐ Great assortment
*by T***C on February 3, 2020*

Great set, fit very well and I guess only time will tell how long they last. Large assortment of sizes and all fit my machine so far. Great value for the price. Case is nice to keep them organized and it is not flimsy.

### ⭐⭐⭐⭐ 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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**Shop now:** [https://www.desertcart.hk/products/38397472-orb-boss-hydraulic-fitting-sae-900-o-ring-seal-kit](https://www.desertcart.hk/products/38397472-orb-boss-hydraulic-fitting-sae-900-o-ring-seal-kit)

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*Product available on Desertcart Hong Kong*
*Store origin: HK*
*Last updated: 2026-03-07*