--- product_id: 38397472 title: "Captain O-Ring BOSS Hydraulic SAE 900 O-Ring Seal Kit (Buna 70, 255pc Kit)" brand: "captain o-ring" price: "€ 91.27" currency: EUR in_stock: true reviews_count: 8 category: "Captain O Ring" url: https://www.desertcart.gr/products/38397472-captain-o-ring-boss-hydraulic-sae-900-o-ring-seal store_origin: GR region: Greece --- # 12 sizes in organized case -40°F to 250°F range 255 precision O-rings Captain O-Ring BOSS Hydraulic SAE 900 O-Ring Seal Kit (Buna 70, 255pc Kit) **Brand:** captain o-ring **Price:** € 91.27 **Availability:** ✅ In Stock ## Summary > 🔧 Seal your success with the ultimate hydraulic O-ring arsenal! ## Quick Answers - **What is this?** Captain O-Ring BOSS Hydraulic SAE 900 O-Ring Seal Kit (Buna 70, 255pc Kit) by captain o-ring - **How much does it cost?** € 91.27 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/products/38397472-captain-o-ring-boss-hydraulic-sae-900-o-ring-seal) ## 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 - • **Smart Organization System:** Shatterproof Flambeau case with size chart and compartments for instant access and zero downtime. - • **Wide Temperature Tolerance:** Operates flawlessly from freezing -40°F up to scorching 250°F — reliability in any environment. - • **Comprehensive 255-Piece Kit:** All essential ORB/BOSS sizes from -904 to -916, ready for any hydraulic challenge. - • **Premium BN70 Buna-N Material:** Industry-standard sealing with superior oil and hydraulic fluid resistance for lasting performance. - • **Proudly USA Assembled & Warrantied:** Quality you can trust, backed by Captain O-Ring’s commitment to excellence. ## Overview The ORB BOSS Hydraulic Fitting SAE 900 O-Ring Seal Kit by Captain O-Ring LLC offers 255 high-quality Buna-N 70 durometer O-rings across 12 essential sizes (-904 to -916). Designed for hydraulic ORB/BOSS fittings, these O-rings provide exceptional sealing against oils and hydraulic fluids, with a robust temperature range from -40°F to 250°F. Packaged in a durable, compartmentalized Flambeau case with a handy size chart, this USA-assembled kit ensures quick, reliable maintenance and repair for professionals who demand precision and durability. ## 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 | #37,584 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #78 in O-Rings | | Brand | Captain O-Ring | | Brand Name | Captain O-Ring | | Color | Black | | 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 BOSS Hydraulic SAE 900 O-Ring Seal Kit (Buna 70, 255pc Kit) - Image 1](https://m.media-amazon.com/images/I/61McUTf2fgL.jpg) ![Captain O-Ring BOSS Hydraulic SAE 900 O-Ring Seal Kit (Buna 70, 255pc Kit) - Image 2](https://m.media-amazon.com/images/I/61IYRERvRSL.jpg) ![Captain O-Ring BOSS Hydraulic SAE 900 O-Ring Seal Kit (Buna 70, 255pc Kit) - Image 3](https://m.media-amazon.com/images/I/717g8TlgbJL.jpg) ![Captain O-Ring BOSS Hydraulic SAE 900 O-Ring Seal Kit (Buna 70, 255pc Kit) - Image 4](https://m.media-amazon.com/images/I/81kE6acXRoL.jpg) ![Captain O-Ring BOSS Hydraulic SAE 900 O-Ring Seal Kit (Buna 70, 255pc Kit) - 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) --- ## 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.gr/products/38397472-captain-o-ring-boss-hydraulic-sae-900-o-ring-seal](https://www.desertcart.gr/products/38397472-captain-o-ring-boss-hydraulic-sae-900-o-ring-seal) --- *Product available on Desertcart Greece* *Store origin: GR* *Last updated: 2026-06-25*