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Captain O-Ring - ORB BOSS Hydraulic Fitting SAE 900 O-Ring Seal Kit (Buna-N 70-255 Piece Kit, 12 Sizes)

4.5 4.5 out of 5 stars 150 ratings
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Amazon's Choice in O-Rings by Captain O-Ring
$43.09
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Purchase options and add-ons

  • 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!

Additional Details

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Frequently bought together

Captain O-Ring - ORB BOSS Hydraulic Fitting SAE 900 O-Ring Seal Kit (Buna-N 70-255 Piece Kit, 12 Sizes)
$43.09
Get it as soon as Wednesday, May 15
In Stock
Sold by Captain O-Ring LLC and ships from Amazon Fulfillment.
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Captain O-Ring ORS/ORFS (for Flat Face Fittings) Hydraulic O-Ring Seal Kit (Buna 90 / BN90-180 Piece Kit)
$28.09
Get it as soon as Wednesday, May 15
In Stock
Sold by Captain O-Ring LLC and ships from Amazon Fulfillment.
+
Captain O-Ring Flange Seal (SAE Code 61/62) Hydraulic O-Ring Seal Kit (Buna 90 / BN90-55 Piece Kit)
$31.09
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Only 20 left in stock - order soon.
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Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Package Dimensions ‏ : ‎ 9.02 x 4.92 x 1.38 inches; 8.04 ounces
  • Item model number ‏ : ‎ BOSS255-BN70
  • Date First Available ‏ : ‎ February 2, 2016
  • Manufacturer ‏ : ‎ Captain O-Ring LLC
  • ASIN ‏ : ‎ B01BE5J23K
  • Customer Reviews:
    4.5 4.5 out of 5 stars 150 ratings

From the brand

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  2. What makes our products unique?

    As a small business, we’re able to relate on a personal level. We offer one-on-one personal support for all of our products. If you have questions about a product or need help with an item you purchased, feel free to reach out and we’d be happy to help!

    Why do we love what we do?

    We take pride in providing products and support that help our customers solve a problem or fix their equipment without the stress and confusion. We’re focused on social and environmental responsibility as an American small business.

  3. Captain O-Ring Logo

    About Us:

    Captain O-ring LLC is a family business opened and operating in New Jersey since 2008. We are dedicated o-ring, molded part, and parts kit specialists, committed to fair, honest products and prices with quality and performance being our goal with every order.

    All of our products are proudly designed, assembled, and supported here in the USA!

  4. Captain O-Ring - Industries Served

    Captain O-Ring LLC

    Captain O-Ring provides o-rings, custom parts, and small parts kits for dozens of industries. How can we help you today?

  5. Proudly Designed, Assembled, and Supported in the USA!

    Captain O-Ring LLC

    All of our Captain O-Ring products are proudly designed, assembled, and supported in the USA!

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Product Description

Captain O-Ring - BOSS Hydraulic SAE 900 O-Ring Seal Kit (Buna-N 70-255 Piece Kit)

Captain O-Ring Boss Fitting Hydraulic BN70 255pc O-Ring 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!

Captain O-Ring ORS/ORFS Hydraulic O-Ring Seal Kit (Buna 90) Captain O-Ring BOSS Hydraulic SAE 900 O-Ring Seal Kit (Buna-N 70-255 Piece Kit) Captain O-Ring Flange Seal Hydraulic O-Ring Seal Kit (Buna 90 / BN90-55 Piece Kit)
Captain O-Ring ORS/ORFS (Flat Face) O-Ring Seal Kit (Buna 90, 180pc Kit) Captain O-Ring BOSS Hydraulic SAE 900 O-Ring Seal Kit (Buna 70, 255pc Kit) Captain O-Ring Flange Seal Hydraulic O-Ring Seal Kit (Buna 90, 55pc Kit)
Customer Reviews
4.6 out of 5 stars
293
4.5 out of 5 stars
150
4.8 out of 5 stars
7
Price $28.09 $43.09 $31.09
Use: O-Rings used in sealing ORS/ORFS Hydraulic Fittings (also called Flat Face fittings) found in hydraulic equipment. O-Rings used in sealing straight thread tube fittings (BOSS / ORB Type) found in hydraulic equipment. O-rings used in sealing Hydraulic Flange Fittings found in hydraulic equipment.
Kit Contents: Includes #4 (1/4" Flat Face), #6 (3/8" Flat Face), #8 (1/2" Flat Face), #10 (5/8" Flat Face), #12 (3/4" Flat Face), #16 (1" Flat Face), #20 (1-1/4" Flat Face), and #24 (1-1/2" Flat Face) o-rings. Includes all sizes between -904 (-4 Fitting, 1/4" Tube OD) to -916 (-16 Fitting, 1" Tube OD). Includes #8 Flange Seal (1/2" Hose), #10 Flange Seal (5/8" Hose), #12 Flange Seal (3/4" Hose), #16 Flange Seal (1" Hose), #20 Flange Seal (1-1/4" Hose), #24 Flange Seal (1-1/2" Hose), and #32 Flange Seal (2" Hose).

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Customer reviews

4.5 out of 5 stars
4.5 out of 5
150 global ratings

Top reviews from the United States

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Wayne mattison
5.0 out of 5 stars Great seller
Reviewed in the United States on February 10, 2024
Verified Purchase
Great product
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TJ
5.0 out of 5 stars Storage
Reviewed in the United States on August 23, 2023
Verified Purchase
Good storage
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Cesar A.
4.0 out of 5 stars Juntas toricas
Reviewed in the United States on March 4, 2024
Estas juntas toricas son milimetricas
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Heidi Grace
5.0 out of 5 stars Excellent o rings
Reviewed in the United States on November 15, 2022
Verified Purchase
High quality o rings. I have not had any deterioration in them when used in my tractors hydraulics
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TomasC
5.0 out of 5 stars Great assortment
Reviewed in the United States on February 3, 2020
Verified Purchase
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.
One person found this helpful
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doby86
5.0 out of 5 stars Nice set!
Reviewed in the United States on June 6, 2021
Verified Purchase
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.
One person found this helpful
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Kk
5.0 out of 5 stars good selection
Reviewed in the United States on June 22, 2021
Verified Purchase
Great quality and selection in kit!
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The Reader Over Yonder!
3.0 out of 5 stars O-rings
Reviewed in the United States on March 15, 2023
Verified Purchase
Will have no useful information until I use a few.
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