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

Industrial O-Ring, Buna-N | 4.209" ID x 7.266" OD | 304 Stainless Steel

Expert Overview

This industrial O-ring, crafted from robust Buna-N and housed in 304 Stainless Steel, offers exceptional sealing performance. Its precise dimensions ensure a reliable fit for critical fluid and gas containment systems.

StandardASTM A106
Material304 Stainless Steel
FinishZinc Plated
GradeN/A
Inside Diameter4.209"
Outside Diameter7.266"
Cross Section0.195"

Detailed Engineering Specifications

Designed for demanding industrial environments, this Buna-N O-ring features an Inside Diameter of 4.209 inches, an Outside Diameter of 7.266 inches, and a Cross Section of 0.195 inches. The 304 Stainless Steel housing provides superior corrosion resistance and mechanical strength, making it ideal for high-pressure and temperature fluctuations. Buna-N's excellent resistance to petroleum-based oils, fuels, and hydraulic fluids ensures longevity in challenging operational conditions. This combination guarantees a secure and durable seal in pumps, valves, cylinders, and static joints within chemical processing, automotive manufacturing, and heavy machinery.

🧊 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 groove and O-ring are clean and free from debris. 2. Lubricate the O-ring and groove with a compatible lubricant. 3. Carefully insert the O-ring into the groove, avoiding any stretching or twisting.

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
Using the wrong size O-ring for the groove.Always verify O-ring dimensions against the groove specifications to ensure proper compression and sealing.
Installing a dry O-ring, leading to tearing.Apply a light coating of compatible lubricant to the O-ring and groove to facilitate installation and prevent damage.

Common Applications

  • Hydraulic Systems
  • Pneumatic Cylinders
  • Fuel Systems
  • Chemical Processing Equipment

⚠️ Engineering Warnings

  • Not suitable for high-temperature applications beyond Buna-N's recommended limits.
  • Avoid exposure to strong oxidizing agents and certain solvents which can degrade Buna-N.

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 Systems, Pneumatic Cylinders, Fuel Systems, Chemical Processing Equipment.

Technical Schematic

O-RING SEAL DIAGRAMAS568 Standard ConfigurationID = 4.209"CS = 0.195"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.