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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)

5.0 (8) Write Review
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$43.09

$ 18 .99 $18.99

In Stock

About this item

  • 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!


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!


TomasC
2025-09-04 10:31:49
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.
Wayne mattison
2025-07-15 12:59:10
Great product
transmitterguy
2025-06-17 10:54:05
I have HF's SAE and metric kits, and the boxes are mostly full. Why? because they don't fit anything. They are close but I think manufacturers deliberately make "O" rings that can't be replaced by any in these kits, LOL. I needed ORB "O" rings for hydraulic fittings I just had hoses, made for and the Captain -O-Ring kit fit and worked great, with NO leaks. I am happy.
Ray
2025-04-09 13:33:03
TRactor
doby86
2025-03-28 14:19:00
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.
donald denham
2025-02-27 19:13:21
My transmission had stopped working on my tractor and I used your o ring to fix it like new. 😁
Heidi Grace
2025-02-25 12:19:03
High quality o rings. I have not had any deterioration in them when used in my tractors hydraulics
Alfonsokit F.
2025-02-07 12:41:09
Very good quality hydraulic o-rings. These will definitely last longer than the mystery o-rings I got last time.