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

Buna-N O-Ring | 316 Stainless Steel, 4.378" OD

Expert Overview

This industrial Buna-N O-ring, encased in robust 316 stainless steel, provides superior sealing performance. Engineered for demanding environments, it ensures reliability and longevity in critical applications.

StandardISO 9001
Material316 Stainless Steel
FinishBlack Oxide
GradeN/A
Inside Diameter6.493"
Outside Diameter4.378"
Cross Section0.268"

Detailed Engineering Specifications

Trusted by engineers across multiple sectors, this industrial O-ring features a precise 6.493" inside diameter, 4.378" outside diameter, and a 0.268" cross-section. The Buna-N elastomer offers excellent resistance to oils, fuels, and many hydraulic fluids, while the 316 stainless steel housing provides exceptional corrosion resistance, making it suitable for use in aggressive chemical environments and high-temperature applications. This combination ensures a leak-proof seal under significant pressure and thermal fluctuations.

🧊 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 mating surfaces are clean, dry, and free from burrs or debris. 2. Carefully position the O-ring within its designated groove, avoiding stretching or twisting. 3. Apply a thin, compatible lubricant to the O-ring and groove if recommended for the specific application to facilitate seating and prevent damage during assembly.

Equivalent Standards (Cross-Reference)

Standard SystemDesignation
ISO EquivalentISO 9001:2015 Mfg
DIN EquivalentIndustry Standard
Primary StandardISO 9001

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
Overtightening fasteners, causing O-ring extrusion or compression set.Adhere to specified torque values for all fasteners to ensure proper sealing pressure without overstressing the O-ring.
Using incompatible lubricants or cleaning agents that degrade the Buna-N elastomer.Consult material compatibility charts and use only lubricants and cleaning agents explicitly recommended for Buna-N and the specific operating environment.

Common Applications

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

⚠️ Engineering Warnings

  • Not recommended for use with strong oxidizing acids, esters, ketones, or certain chlorinated hydrocarbons.
  • Ensure operating temperature remains within the specified range for Buna-N to maintain sealing integrity.

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 Equipment, Chemical Processing, Automotive Fuel Systems.

Technical Schematic

O-RING SEAL DIAGRAMAS568 Standard ConfigurationID = 6.493"CS = 0.268"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.