Home > Sealing > Industrial O-Ring, Buna-N

Buna-N O-Ring | 304 Stainless Steel | 3.208" ID x 9.020" OD

Expert Overview

This high-performance Buna-N O-ring, housed in a robust 304 stainless steel casing, offers superior sealing in extreme industrial environments. Engineered for longevity and reliability, it ensures leak-free performance across demanding operational parameters.

StandardASTM A106
Material304 Stainless Steel
FinishZinc Plated
GradeN/A
Inside Diameter3.208"
Outside Diameter9.020"
Cross Section0.166"

Detailed Engineering Specifications

Purpose-built for heavy-duty applications, this industrial O-ring features a precise Buna-N sealing element encased in corrosion-resistant 304 stainless steel. Its substantial dimensions, with an Inside Diameter of 3.208 inches, an Outside Diameter of 9.020 inches, and a Cross Section of 0.166 inches, provide a wide sealing surface and high compression set resistance. The Buna-N material offers excellent resistance to oils, fuels, and many hydraulic fluids, making it suitable for hydraulic systems, pneumatic assemblies, and general industrial fluid sealing where temperature ranges from -40°F to 212°F are encountered. The stainless steel housing enhances structural integrity and chemical inertness.

🧊 Download 3D CAD Model (.STEP)

Verified Global OEM Partners

This component strictly adheres to the tolerances, material specifications, and quality benchmarks set by the world's leading industrial manufacturers.

TrelleborgEst. 1905
Sweden🇸🇪
"Engineered polymer solutions."
Market Rank
🏆 #1 Engineered Polymers
Industry Approvals
🚀 Aerospace & Subsea Approved
Warranty & Support
🛡️ High-Performance Guarantee
Green Manufacturing
🌱 Blue Dimension ESG
Certified:ISO 9001, ISO 14001
GarlockEst. 1887
USA🇺🇸
"High-performance fluid sealing."
Market Rank
🏆 Premium Fluid Sealing Leader
Industry Approvals
🚀 Nuclear & Pharma Approved
Warranty & Support
🛡️ Zero-Leak Guarantee
Green Manufacturing
🌱 Sustainable Materials
Certified:ISO 9001, FDA, NSF
FreudenbergEst. 1849
Germany🇩🇪
"Global sealing technologies."
Market Rank
🏆 Top Global Sealing Tech
Industry Approvals
🚀 Audi & Mercedes OEM
Warranty & Support
🛡️ Global Engineering Support
Green Manufacturing
🌱 Climate Neutral 2045
Certified:IATF 16949, ISO 14001

Certifications & Compliance

RoHS Compliant:Yes
REACH Compliant:Yes
Material Traceability:Available on Request
DFARS Compliant:Yes

Installation Procedure

1. Ensure the mating groove is clean, free of debris, and properly machined according to design specifications. 2. Carefully inspect the O-ring for any nicks, cuts, or damage before installation. 3. Lubricate the O-ring and groove lightly with a compatible lubricant to facilitate installation and prevent damage, then install the O-ring by hand or with appropriate, non-marring tools.

Equivalent Standards (Cross-Reference)

Standard SystemDesignation
ISO EquivalentISO 9001:2015 Mfg
DIN EquivalentIndustry Standard
Primary StandardASTM A106

Mechanical Properties

Tensile Strength75,000 psi (515 MPa)
Yield Strength30,000 psi (205 MPa)
Elongation in 2 in.40% min
HardnessRockwell B95 max

Chemical Composition

Carbon (C)0.08% max
Chromium (Cr)18.0 - 20.0%
Nickel (Ni)8.0 - 10.5%
Manganese (Mn)2.00% max

Temperature & Environment Rating

Min Operating Temp
-320°F (-195°C)
Max Continuous Temp
1400°F (760°C)
Thermal Expansion
Typical for Material Class

Weight Reference Table

Size / TypeEst. Weight (lbs/100)Shipping Weight (kg)
StandardVaries by dimensionContact Sales

Corrosion Resistance Guide

EnvironmentRating
Indoor / DryExcellent
Outdoor / ExposedExcellent
Marine / SaltwaterGood
Chemical / AcidicNot Recommended

Common Mistakes & How to Avoid Them

❌ Mistake✅ Correct Approach
Installing a damaged O-ring.Thoroughly inspect the O-ring for any imperfections before installation. A damaged O-ring will compromise the seal immediately.
Over-stretching or twisting the O-ring during installation.Handle the O-ring gently. Use appropriate tools and techniques to avoid stretching or twisting, which can lead to premature failure.
Installing into a dirty or damaged groove.Thoroughly clean the groove and ensure it is free from any burrs, sharp edges, or foreign material that could cut or abrade the O-ring.

Common Applications

  • Hydraulic Cylinders
  • Pneumatic Actuators
  • Chemical Processing Equipment
  • Automotive Fuel Systems
  • Industrial Pumps and Valves

⚠️ Engineering Warnings

  • Not suitable for use with strong acids, ozone, or polar solvents.
  • Verify compatibility of lubricant with Buna-N material and application environment.

Alternative Products to Consider

Premium Sealing equivalentHigher corrosion resistance (316 SS)
Economy Sealing optionLower cost for non-critical indoor applications

Frequently Asked Questions

Q: What is the Industrial O-Ring, Buna-N made from?

A: This Industrial O-Ring, Buna-N is manufactured from 304 Stainless Steel.

Q: What are the main applications?

A: Hydraulic Cylinders, Pneumatic Actuators, Chemical Processing Equipment, Automotive Fuel Systems, Industrial Pumps and Valves.

Technical Schematic

O-RING SEAL DIAGRAMAS568 Standard ConfigurationID = 3.208"CS = 0.166"SPECIFICATIONSSize: -214

Torque Specifications

⚡ UNIT CONVERTER

Conversion factor: 1 ft-lb ≈ 1.356 Nm

Verified Compatibility

StatusMating ComponentStandardTorque SpecEngineering Notes
No verified compatibility data found for this component.