OSK™ Industrial Boss Seal Kit - 212 Piece Hydraulic SAE - Buna-N 90


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  • Model: K212X20N90-OSK
  • 29 in Stock
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O-Ring BOSS Hydraulic SAE 212 Pieces Oring Seal Kit Buna-N 90A for Boss SAE Boss straight thread tube fittings 

Maximize your sealing solutions with our Industrial Boss Seal Kit #K212X20N90-OSK. This comprehensive kit includes 212 high-quality Buna-N 90 durometer O-Rings in 20 different sizes, ensuring you have the right seal for any boss application.

Key Features:

  • Material: 90 Durometer Buna-N (Nitrile) - Known for exceptional resistance to many hydraulic fluids and superior low-temperature flexibility.
  • Versatility: Ideal for high-pressure applications in hydraulic and pneumatic systems, ensuring reliable performance and durability.
  • Comprehensive Selection: Contains 212 O-Rings across 20 different sizes, offering an excellent cost-per-size value.

Kit Includes: -10 each: -901, -902, -903, -904, -911, -912, -913, -914, -916, -918, -920, -924, -928, -932 -12 each: -905, -906, -907, -908, -909, -910

Material Benefits:

  • Temperature Range: -40°F to +250°F
  • Resistance: Excellent resistance to petroleum-based oils, hydrocarbon fuels, silicone oils, lubricants, and most dilute acids.
  • Durability: Outstanding tensile strength and abrasion resistance, ensuring long-lasting performance.
  • Applications: Suitable for hydraulic fluids, gasoline, L.P. gases, cold water, silicone greases and oils, di-ester base lubricants, and ethylene glycol base fluids.


  • Not recommended for use with halogenated hydrocarbons, nitro hydrocarbons, phosphate ester hydraulic fluids, ketones, ozone, sunlight, UV exposure, weather, and strong acids.

Technical Specifications:

  • Color: Black
  • Cure: Sulfur-cured for high pressure applications
  • Compliance: Meets or exceeds ASTM D2000-75 Grade 7BG915 B14 E14 E34 E51 E61 F16 L14 and ASTM D2000-01 Grade M7BG910 B14 EA14 EF11 EF21 EO14 EO34 F16 standards.

Typical Uses:

  • General purpose sealing
  • Hydraulic and pneumatic motors
  • Cylinders, pumps, and valves
  • Boss tube fittings and hydraulic pumping sealing applications

Order your Industrial Boss Seal Kit today and ensure you have the reliability and performance you need for any sealing challenge. At The O-Ring Store, we make getting O-Rings easy!

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