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

304 Stainless Steel Buna-N O-Ring | 0.382" ID x 8.940" OD

Expert Overview

This industrial O-ring features a Buna-N elastomer seal within a robust 304 stainless steel housing. Engineered for exceptional durability and broad chemical resistance, it ensures reliable sealing in challenging environments.

StandardDIN 933
Material304 Stainless Steel
FinishBlack Oxide
GradeN/A
Inside Diameter0.382"
Outside Diameter8.940"
Cross Section0.138"

Detailed Engineering Specifications

Engineered for reliability and performance, this industrial O-ring boasts a precise 0.382" inside diameter, 8.940" outside diameter, and a 0.138" cross-section. The Buna-N (Nitrile Butadiene Rubber) elastomer offers excellent resistance to oils, fuels, and many hydraulic fluids, making it suitable for moderate temperature applications up to 230°F (110°C). The 304 stainless steel construction provides superior corrosion resistance, mechanical strength, and is non-magnetic, ensuring longevity and integrity in demanding industrial settings.

🧊 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 sealing surfaces are clean, dry, and free from debris. 2. Carefully inspect the O-ring for any nicks or damage before installation. 3. Gently install the O-ring into its groove, avoiding stretching or twisting.

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)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
Overstretching the O-ring during installation.Handle the O-ring with care and ensure it fits snugly into the groove without excessive tension.
Installing on dirty or damaged sealing surfaces.Thoroughly clean and inspect sealing grooves and mating surfaces prior to O-ring installation.

Common Applications

  • Hydraulic systems
  • Pneumatic systems
  • Automotive fuel systems
  • Chemical processing equipment
  • General industrial machinery

⚠️ Engineering Warnings

  • Not suitable for exposure to ozone, strong oxidizing agents, or ketones.
  • Operating temperature range should not be exceeded to maintain seal 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 304 Stainless Steel.

Q: What are the main applications?

A: Hydraulic systems, Pneumatic systems, Automotive fuel systems, Chemical processing equipment, General industrial machinery.

Technical Schematic

O-RING SEAL DIAGRAMAS568 Standard ConfigurationID = 0.382"CS = 0.138"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.