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

Industrial Buna-N O-Ring | 304 SS | 4.987" OD | 9.931" ID

Expert Overview

Engineered for superior sealing performance, this industrial O-ring features a robust Buna-N elastomer housed within a corrosion-resistant 304 stainless steel casing. Its precise dimensions ensure a reliable seal in critical applications.

StandardASME B18
Material304 Stainless Steel
FinishZinc Plated
GradeN/A
Inside Diameter9.931"
Outside Diameter4.987"
Cross Section0.183"

Detailed Engineering Specifications

A proven choice for industrial professionals, this O-ring boasts an Inside Diameter of 9.931 inches, an Outside Diameter of 4.987 inches, and a Cross Section of 0.183 inches. The Buna-N (Nitrile) material offers excellent resistance to oils, fuels, and many chemicals, making it suitable for a wide range of operating environments. The 304 stainless steel housing provides exceptional durability and resistance to corrosion, ensuring long-term integrity and performance in demanding industrial settings. This combination of materials and precise geometry makes it ideal for hydraulic systems, pneumatic equipment, and general fluid sealing.

🧊 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 position the O-ring within the groove, avoiding any stretching or twisting. 3. Apply a thin, compatible lubricant if necessary to facilitate installation and prevent damage during assembly.

Equivalent Standards (Cross-Reference)

Standard SystemDesignation
ISO EquivalentISO 9001:2015 Mfg
DIN EquivalentIndustry Standard
Primary StandardASME B18

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
Stretching the O-ring during installation, leading to premature failure.Handle the O-ring gently and avoid excessive stretching. If a lubricant is required, use a compatible type sparingly.
Using an incompatible lubricant or cleaner that degrades the Buna-N material.Consult compatibility charts to select lubricants and cleaners specifically designed for Buna-N elastomers.
Installing the O-ring into a damaged or contaminated groove.Thoroughly inspect and clean all mating surfaces before installation to ensure a proper seal.

Common Applications

  • Hydraulic Systems
  • Pneumatic Actuators
  • Chemical Processing Equipment
  • Automotive Fuel Systems
  • General Fluid Containment

⚠️ Engineering Warnings

  • Not suitable for high-temperature applications above 250°F (121°C).
  • Avoid exposure to strong oxidizing agents and ozone.

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 Actuators, Chemical Processing Equipment, Automotive Fuel Systems, General Fluid Containment.

Technical Schematic

O-RING SEAL DIAGRAMAS568 Standard ConfigurationID = 9.931"CS = 0.183"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.