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

Buna-N O-Ring | 3.489" ID x 8.833" OD | 316 Stainless Steel

Expert Overview

Engineered for critical sealing applications, this Buna-N O-ring features exceptional chemical resistance and durability. Constructed with a robust 316 stainless steel housing, it ensures reliable performance under extreme pressures and temperatures.

StandardDIN 933
Material316 Stainless Steel
FinishZinc Plated
GradeN/A
Inside Diameter3.489"
Outside Diameter8.833"
Cross Section0.073"

Detailed Engineering Specifications

A high-performance industrial component, this Buna-N O-ring is meticulously manufactured with an inside diameter of 3.489 inches, an outside diameter of 8.833 inches, and a precise cross-section of 0.073 inches. The Buna-N elastomer provides excellent resistance to oils, fuels, and hydraulic fluids, making it ideal for applications within the automotive, aerospace, and chemical processing industries. The 316 stainless steel construction offers superior corrosion resistance, ensuring long-term integrity in aggressive environments and high-pressure systems.

🧊 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 surfaces are clean, dry, and free from debris or damage. 2. Carefully lubricate the O-ring with a compatible lubricant to prevent tearing during installation. 3. Gently compress and slide the O-ring into its designated groove, avoiding any twisting or stretching.

Equivalent Standards (Cross-Reference)

Standard SystemDesignation
ISO EquivalentISO 9001:2015 Mfg
DIN EquivalentIndustry Standard
Primary StandardDIN 933

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)16.0 - 18.0%
Nickel (Ni)10.0 - 14.0%
Molybdenum (Mo)2.0 - 3.0%

Temperature & Environment Rating

Min Operating Temp
-320°F (-195°C)
Max Continuous Temp
1500°F (815°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 / SaltwaterExcellent
Chemical / AcidicGood

Common Mistakes & How to Avoid Them

❌ Mistake✅ Correct Approach
Using incompatible lubricants that degrade Buna-N.Always consult a chemical compatibility chart for lubricants suitable for Buna-N.
Over-stretching or twisting the O-ring during installation.Handle the O-ring with care, and ensure it is properly seated without excessive deformation.

Common Applications

  • Hydraulic systems
  • Pneumatic cylinders
  • Fuel injection systems
  • Chemical processing equipment

⚠️ Engineering Warnings

  • Not suitable for exposure to ozone, strong acids, or polar solvents.
  • Ensure proper temperature range is maintained for optimal performance and lifespan.

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 316 Stainless Steel.

Q: What are the main applications?

A: Hydraulic systems, Pneumatic cylinders, Fuel injection systems, Chemical processing equipment.

Technical Schematic

O-RING SEAL DIAGRAMAS568 Standard ConfigurationID = 3.489"CS = 0.073"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.