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Buna-N Brass O-Ring - 7.771" ID x 6.918" OD

Expert Overview

This industrial O-ring features a durable Buna-N elastomer and a Brass construction for robust sealing. Precisely manufactured to stringent tolerances, it provides a reliable barrier against leaks in demanding applications.

StandardASTM A106
MaterialBrass
FinishPassivated
GradeN/A
Inside Diameter7.771"
Outside Diameter6.918"
Cross Section0.089"

Detailed Engineering Specifications

Engineered for reliability and performance, this Buna-N O-ring is designed with an Inside Diameter of 7.771 inches, an Outside Diameter of 6.918 inches, and a precise Cross Section of 0.089 inches. The Buna-N (Nitrile) material offers excellent resistance to oils, fuels, and many hydraulic fluids, making it suitable for a wide range of industrial sealing tasks. The Brass material provides excellent corrosion resistance and compatibility in specific environments where non-ferrous metals are preferred or required. This combination ensures long-term sealing integrity under moderate pressure and temperature conditions.

🧊 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:N/A

Installation Procedure

1. Ensure the groove is clean, dry, and free of debris. 2. Carefully compress the O-ring to fit within the groove, avoiding overstretching or twisting. 3. Verify proper seating and compression for a secure seal.

Equivalent Standards (Cross-Reference)

Standard SystemDesignation
ISO EquivalentISO 9001:2015 Mfg
DIN EquivalentIndustry Standard
Primary StandardASTM A106

Mechanical Properties

Tensile StrengthStandard Commercial Spec
Yield StrengthStandard Commercial Spec
HardnessVaries by specific batch

Chemical Composition

Copper (Cu)60.0 - 63.0%
Zinc (Zn)Balance
Lead (Pb)2.5 - 3.7%

Temperature & Environment Rating

Min Operating Temp
-20°F (-29°C)
Max Continuous Temp
400°F (204°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 / ExposedModerate
Marine / SaltwaterNot Recommended
Chemical / AcidicNot Recommended

Common Mistakes & How to Avoid Them

❌ Mistake✅ Correct Approach
Overtightening fasteners, which can crush the O-ring and compromise the seal.Torque fasteners to manufacturer specifications, ensuring consistent pressure distribution.
Using incompatible cleaning agents that can degrade the Buna-N material.Clean the O-ring and groove with mild soap and water or a compatible solvent recommended for Buna-N.
Failing to inspect the O-ring for damage or wear before installation.Visually inspect the O-ring for nicks, cuts, or signs of embrittlement before placement.

Common Applications

  • Hydraulic systems
  • Pneumatic equipment
  • Fluid power assemblies
  • Chemical processing
  • Automotive components

⚠️ Engineering Warnings

  • Not suitable for use with strong oxidizing agents, ketones, or esters.
  • Operating temperature range should not exceed material limitations for optimal performance and longevity.

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 Brass.

Q: What are the main applications?

A: Hydraulic systems, Pneumatic equipment, Fluid power assemblies, Chemical processing, Automotive components.

Technical Schematic

O-RING SEAL DIAGRAMAS568 Standard ConfigurationID = 7.771"CS = 0.089"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.