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O-Ring

O-Ring
O-ring Product Image

O-rings, featuring a circular cross-section design, are among the most commonly used sealing elements for both dynamic and static applications. With a simple structure and stable performance, O-rings are widely applied in industrial equipment to effectively prevent liquid and gas leakage.

Key Characteristics of O-Rings

O-ring Dimensional Formula
OD = ID + 2 × CS
  • Size Standards:
    Defined by international standards such as AS568, JIS, and METRIC.
  • Tolerance Control:
    Strict precision ensures no sealing failure or leakage risks.
  • Material Properties:
    Elastomeric polymers with excellent elastic memory for shape recovery.

Why Choose O-Rings?

Versatile Conditions
High/low pressure and temperature resistance.
Easy Installation
No sealants or precise torque control required.
Space Saving
Compact and lightweight design for any system.
Sealing Solution Application

About Best Ring Industrial Co.

Best Ring is a professional manufacturer specializing in high-quality O-rings and sealing solutions. Our products serve industries such as automotive, aerospace, and general machinery.

We engineer O-rings to withstand extreme environments, using rigorous testing and strict quality control to ensure consistency and extend equipment service life. Whether standard or customized, Best Ring is your trusted partner.

O-Rings are manufactured according to various international and regional size standards. AS-568, METRIC, and JIS B2401 are the core pillars of industrial sealing applications.

Commonly Used Size Specifications

Size Standard Description Link
AS-568 (US Standard) The most widely used standard globally using inch units. Ideal for hydraulic and pneumatic systems in industrial machinery. View Sizes
METRIC (ISO/DIN) Compliant with ISO 3601 and DIN 3771. The standard for European automation and global standardized designs. View Sizes
JIS B2401 (Japan) Divided into P, G, S, V series. Predominant in Japanese precision machinery and electronics industries. View Sizes

Specialized & Regional Standards

Size Standard Description Link
JASO F404 (Automotive) Established by the Japanese Automotive Standards Organization. Critical for engines and transmissions. JASO List
BS 4518 (British) British Standard for metric sizes, featuring specific cross-sections used in legacy UK equipment. BS List
GB/T 3452.1 (China) Aligned with ISO 3601. The national standard for O-rings within the Chinese domestic equipment market. GB List

Common Elastomer Materials Overview

Material Technical Characteristics Recommended For Not Recommended Typical Applications
NBR Nitrile Rubber Oil-resistant. High ACN improves tensile/abrasion but reduces low-temp flex. ✔ Petroleum oils, Water (≤100°C), Weak acids/alkalis. ✘ Aromatic fuels, Ozone, Polar solvents. 70 Shore A: Mineral oils (-30 to 110°C)
90 Shore A: High-pressure oil (-50 to 120°C)
EPDM Ethylene Propylene Superior ozone, weathering & chemical resistance. Excellent insulation. ✔ Brake fluids, diluted acids, steam (≤204°C). ✘ Petroleum oils, Aliphatic hydrocarbons. 70 Shore A: Water, Air, Alcohols (-50 to 150°C)
FKM Fluoroelastomer Outstanding heat resistance & low gas permeability. Great ozone resistance. ✔ Chlorinated hydrocarbons, High vacuum, Petroleum oils. ✘ Hot steam, Amines, Brake fluids. 75 Shore A: Aerospace, Automotive high-heat seals (-30 to 275°C)
PU Polyurethane Exceptional mechanical strength & abrasion resistance. Handles high pressure. ✔ Mineral/Silicone oils, Oxygen, Water (≤50°C). ✘ Solvents, Superheated steam, Strong acids. 70-95 Shore A: Hydraulic cylinders, high-wear seals (-50 to 100°C)
HNBR Hydrogenated NBR Enhanced NBR with superior tensile strength and oxidation resistance. ✔ High-temp oil seals, Refrigerants, Engine parts. ✘ Strong alkalis, Esters, Ketones. 60-90 Shore A: Fuel and oil system seals (-40 to 140°C)
VMQ Silicone Excellent UV/ozone resistance. Wide temperature range, non-toxic, and outstanding elasticity. ✔ Engine/transmission oil, Ozone, Dry heat, Silicone grease. ✘ Petroleum fuels, Ketones, Concentrated acids, Steam. 70 Shore A: High-temp sealing, medical (-70 to 300°C)
CR Chloroprene Good balance of properties. Flame retardant; resistant to vegetable/animal oils. ✔ Weathering, Ozone, Compressed air, Water. ✘ Strong acids, Esters, Ethers, Aromatic solvents. 40-50 Shore A: Flame-resistant seals, hoses (-40 to 100°C)
AEM Ethylene Acrylic Balanced heat and oil resistance with good elasticity. ✔ Automotive air intake, Transmission seals, Hoses. ✘ Strong acids/alkalis, Aromatic fuels, Ketones. Engine and transmission sealing up to 150°C.
ACM Acrylic Rubber Excellent high-temp oil resistance; poor hot water/low-temp performance. ✔ Automatic transmission fluids (ATF), High-temp oils. ✘ Water, Acids, Alkalis, Fuels, Aromatic chemicals. 50-70 Shore A: ATF and transmission seals (-35 to 150°C)
NR Natural Rubber Excellent elasticity and tear strength. Poor ozone resistance. ✔ Dynamic seals, Vibration dampers, Mining gear. ✘ Oils, Fuels, Ozone, UV exposure. 40-90 Shore A: Anti-vibration pads (-40 to 100°C)
SBR Styrene Butadiene Improved heat aging over NR; good water resistance but poor oil resistance. ✔ General seals, Hoses, Gaskets, Tires. ✘ Oils, Fuels, Oxidizing agents, Outdoor use. 40-90 Shore A: Shock absorbers, rubber strips (-40 to 100°C)
XNBR Carboxylated NBR Modified NBR with very high abrasion and tear resistance. ✔ High-wear seals, Industrial oil seals, Hydraulic. ✘ Aromatic solvents, Strong oxidizers, Ketones. Wear-resistant O-Rings and heavy-duty seals.
IIR Butyl Rubber Extremely low gas permeability. Excellent chemical resistance. ✔ Vacuum systems, Gas seals, Acidic environments. ✘ Petroleum oils, Aromatic solvents, Brake fluids. 50-80 Shore A: Vacuum O-Rings, Medical (-50 to 120°C)
O-Ring FAQ Icon

O-Ring Seals FAQ

Expert Guidance on Selection, Installation & Failure Prevention

Q1: What is an O-Ring and how does it create a seal?

An O-Ring creates a seal through mechanical deformation. When compressed in a groove, its inherent elastic "memory" exerts constant pressure against the surfaces, blocking gas or liquid paths.

Q2: How do I choose the right material?

NBR (Nitrile) General oil & fuel resistance.
(-50°C to +120°C)
FKM (Viton®) High temp & chemical/vacuum use.
(-30°C to +275°C)
EPDM Steam, water & UV. No oil.
(-50°C to +150°C)
Silicone Extreme flex & Food-grade.
(-70°C to +300°C)

Q3: What causes "Extrusion and Nibbling"?

This occurs when excessive pressure forces the O-Ring into the clearance gap.

Prevention methods:
✔ Reduce clearance gap ✔ Increase Hardness (90 Shore A) ✔ Use Back-up Rings

Q4: What is "Compression Set"?

It is the permanent deformation of an O-Ring after long-term compression. Choosing a material with a low compression set is vital for maintaining the "spring-back" required for sealing.

CRITICAL SAFETY ADVICE

Q5: Can I reuse an O-Ring?

NO. Once disassembled, an O-Ring has already undergone physical flattening. Reusing it significantly increases the risk of immediate leakage. Always replace with a new seal during maintenance.

Q6: What are the standard O-Ring sizing systems?

We supply O-Rings complying with all major international standards to ensure perfect fitment:

AS568 Standard The Aerospace Standard. Most common sizing system used in the USA and aerospace applications.
Metric (ISO) Specified precisely by Inner Diameter (I.D.) × Cross Section (C.S.). Used globally.
JIS B2401 The Japanese Industrial Standard. Categorized into specific series: P (Moving), G (Fixed), V (Vacuum).

сопутствующие товары / Best Ring Industrial Corporation

Резиновая шайба (Rezinovaya Shaiba)
Резиновая шайба (Rezinovaya Shaiba)
Прокладка (Prokladka)
Прокладка (Prokladka)
Резиновая полоса
Резиновая полоса
Резиновые втулки (Grommets)
Резиновые втулки (Grommets)
X-кольца (Quad-Rings)
X-кольца (Quad-Rings)
Опорное кольцо
Опорное кольцо
V-образное кольцо
V-образное кольцо
D-образное кольцо
D-образное кольцо
U-кольца
U-кольца
резиновый чехол
резиновый чехол

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