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O-Ring Articles & Case Studies

Browse published O-ring guides, troubleshooting articles, application examples and case studies. For a task-based starting point, use the Technical Resources hub.

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Airgun O-Ring Extrusion: How Clearance Gaps Cause Pressure Leaks Airgun O-Ring Extrusion: How Clearance Gaps Cause Pressure Leaks Learn how clearance gaps, pressure, hardness, and groove design can cause airgun O-ring extrusion and repeated pneumatic sealin... Read guide Airgun Fill Connection O-Rings: A Case Study in Wear and Intermittent Leaks Airgun Fill Connection O-Rings: A Case Study in Wear and Intermittent Leaks Learn how repeated insertion, edge damage, debris, and material choice affect airgun fill connection O-rings in a practical pne... Read guide CO2 Airgun O-Rings: Material Selection for Cold and Pressure Cycling CO2 Airgun O-Rings: Material Selection for Cold and Pressure Cycling Learn how CO2 cooling and pressure cycling affect airgun O-rings, and compare NBR, FKM, and polyurethane for reliable pneumatic... Read guide Polyurethane vs NBR O-Rings for Airgun Valves and Fill Connections: A Case Study Polyurethane vs NBR O-Rings for Airgun Valves and Fill Connections: A Case Study Compare polyurethane and NBR O-rings for airgun valves, pressure chambers, and fill connections in a practical pneumatic sealin... Read guide How to Measure and Identify Replacement O-Rings for Airgun Seals: A Case Study How to Measure and Identify Replacement O-Rings for Airgun Seals: A Case Study Learn how a pneumatic equipment supplier identified replacement airgun O-rings by measuring inside diameter, cross-section, gro... Read guide Airgun O-Ring Sealing Case Study: Solving Pressure Loss and Repeated Leakage Airgun O-Ring Sealing Case Study: Solving Pressure Loss and Repeated Leakage Explore an airgun O-ring sealing case involving pressure loss, repeated leakage, material selection, groove condition, lubricat... Read guide

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Ready to order? Start from the common sizes

Most equipment uses standard AS568 or metric sizes. Pick one to see every listed material and hardness, or search your exact ID × CS.

Common sizes-010 6.07 × 1.78-012 9.25 × 1.78-014 12.42 × 1.78-110 9.19 × 2.62-112 12.37 × 2.62-114 15.54 × 2.62-210 18.64 × 3.53-214 24.99 × 3.5310 × 2.00 mm15 × 2.00 mm20 × 2.50 mm25 × 3.00 mm30 × 3.00 mm40 × 3.00 mm
Only have the old ring? Measure it → Open the size finder

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Core guides by size, material, application, troubleshooting and compatibility. Each guide is listed once.

Troubleshooting & Buying Help

Use these when an O-ring leaks, the installation is difficult, or the buying path is unclear.

1 GUIDES
O-ring FAQ guide for small pack buyers with replacement seals, size checks, and material selection O-Ring FAQ for Small Pack Buyers Practical answers about O-ring size, material, hardness, small packs, installation, and when an order needs... Read guide

More guides

Groove design, sealing basics, special profiles and case studies.

Airgun O-Ring Extrusion: How Clearance Gaps Cause Pressure LeaksAirgun O-Ring Extrusion: How Clearance Gaps Cause Pressure LeaksAirgun Fill Connection O-Rings: A Case Study in Wear and Intermittent LeaksAirgun Fill Connection O-Rings: A Case Study in Wear and Intermittent LeaksCO2 Airgun O-Rings: Material Selection for Cold and Pressure CyclingCO2 Airgun O-Rings: Material Selection for Cold and Pressure CyclingPolyurethane vs NBR O-Rings for Airgun Valves and Fill Connections: A Case StudyPolyurethane vs NBR O-Rings for Airgun Valves and Fill Connections: A Case StudyHow to Measure and Identify Replacement O-Rings for Airgun Seals: A Case Study How to Measure and Identify Replacement O-Rings for Airgun Seals: A Case StudyAirgun O-Ring Sealing Case Study: Solving Pressure Loss and Repeated Leakage Airgun O-Ring Sealing Case Study: Solving Pressure Loss and Repeated LeakageO-Ring Clearance Gap: How Extrusion Damage Starts O-Ring Clearance Gap: How Extrusion Damage StartsO-Ring Groove Fill: Why Available Gland Space Matters O-Ring Groove Fill: Why Available Gland Space MattersO-Ring Squeeze: How Much Compression Does a Seal Need? O-Ring Squeeze: How Much Compression Does a Seal Need?O-Ring Stretch: How Much Is Too Much? O-Ring Stretch: How Much Is Too Much?O-Ring Swelling: Causes, Materials, and What Buyers Should Check O-Ring Swelling: Causes, Materials, and What Buyers Should CheckO-Ring Lubrication Mistakes: What Buyers Should Avoid O-Ring Lubrication Mistakes: What Buyers Should AvoidO-Ring Tolerances: Why Small Size Differences Cause Leaks O-Ring Tolerances: Why Small Size Differences Cause LeaksCustom O-Rings: When Standard Sizes Do Not Fit Custom O-Rings: When Standard Sizes Do Not FitNeoprene O-Rings: Properties, Applications, and Selection Guide Neoprene O-Rings: Properties, Applications, and Selection GuideOxxRing Expands Online O-Ring and Repair Kit Selection for Home, Automotive and Workshop Maintenance OxxRing Expands Online O-Ring and Repair Kit Selection for Home, Automotive and Workshop MaintenancePolyurethane O-Rings: Properties, Applications, and Selection Guide Polyurethane O-Rings: Properties, Applications, and Selection GuideX-Rings: Practical Guide for O-Ring Buyers X-Rings: Practical Guide for O-Ring BuyersFFKM O-Rings: Properties, Applications, and Selection Guide FFKM O-Rings: Properties, Applications, and Selection GuideWhat Is an O-Ring? A Practical Guide for Buyers What Is an O-Ring? A Practical Guide for BuyersPTFE / Teflon O-Rings: Properties, Applications, and Selection Guide PTFE / Teflon O-Rings: Properties, Applications, and Selection GuideFlat O-Rings: Practical Guide for O-Ring Buyers Flat O-Rings: Practical Guide for O-Ring BuyersSquare O-Rings: Practical Guide for O-Ring Buyers Square O-Rings: Practical Guide for O-Ring BuyersHNBR O-Rings Explained: Properties, Applications, and When to Choose Them HNBR O-Rings Explained: Properties, Applications, and When to Choose ThemO-Ring Surface Finish Guide: How Roughness Affects Seal Performance O-Ring Surface Finish Guide: How Roughness Affects Seal PerformanceO-Ring Groove Design Basics: Squeeze, Stretch, and Groove Fill O-Ring Groove Design Basics: Squeeze, Stretch, and Groove FillO-Ring Extrusion: Causes, Pressure Limits, and How Backup Rings Help O-Ring Extrusion: Causes, Pressure Limits, and How Backup Rings HelpO-Ring Lubrication Guide: What to Use and What to Avoid O-Ring Lubrication Guide: What to Use and What to AvoidO-Ring Installation Mistakes: How to Avoid Pinched, Twisted, or Cut Seals O-Ring Installation Mistakes: How to Avoid Pinched, Twisted, or Cut SealsO-Ring Failure Causes: What Buyers Should Check Before Replacing Seals O-Ring Failure Causes: What Buyers Should Check Before Replacing SealsHow to Store Rubber O-Rings to Prevent Aging How to Store Rubber O-Rings to Prevent AgingCompression Set in O-Rings: What Buyers Should Know Compression Set in O-Rings: What Buyers Should KnowStatic vs Dynamic O-Rings: What Buyers Should Know Static vs Dynamic O-Rings: What Buyers Should KnowMetric vs AS568 O-Rings: How to Choose the Right Standard Metric vs AS568 O-Rings: How to Choose the Right StandardO-Ring Hardness 70A vs 80A: What Buyers Should Know O-Ring Hardness 70A vs 80A: What Buyers Should KnowPressure washer O-ring size guide showing inside diameter, cross section, and outside diameter measurements Pressure Washer O-Ring Size Guide: 5 Common Metric Sizes and Material ChoicesRubber Gasket vs O-Ring: What Buyers Should Know Rubber Gasket vs O-Ring: What Buyers Should KnowO-Ring Kits for Maintenance Teams: What Buyers Should Know O-Ring Kits for Maintenance Teams: What Buyers Should KnowEPDM O-Rings for Water and Outdoor Use: What Buyers Should Know EPDM O-Rings for Water and Outdoor Use: What Buyers Should KnowViton / FKM O-rings infographic showing heat, fuel, oil, and chemical resistance, applications, material comparison, and sizing checklist. Viton O-Rings for Heat and Chemical Exposure: What Buyers Should KnowInfographic about food-grade silicone O-rings, covering temperature resistance, repeated cleaning, sanitary equipment applications, material comparison, sizing, hardness, and replacement checks. Silicone O-Rings for Food Equipment: What Buyers Should KnowIndustrial rubber seals and O-rings used with pumps, valves, flanges, and other industrial equipment. Rubber Seals for Industrial Equipment: What Buyers Should KnowReplacement O-rings for common faucet, valve, pump, hose fitting, and industrial equipment repairs. How to Choose a Replacement O-Ring for Common RepairsIndustrial Seals Selection Guide for Buyers Industrial Seals Selection Guide for BuyersEPDM vs NBR O-Rings: Which Material Works Better for Water and Oil? EPDM vs NBR O-Rings: Which Material Works Better for Water and Oil?O-ring measurement guide showing ID, OD, and cross section with caliper How to Measure an O-Ring: ID, OD, and Cross Section ExplainedGloved hands measuring an O-ring with a caliper on an industrial workbench AS568 O-Ring Replacement: How to Measure a Worn Seal Before You BuyPressure washer hose connector, quick-connect coupler, O-rings, and caliper on a repair workbench How to Choose O-Rings for Pressure Washer Quick-Connect LeaksO-ring buying guide with caliper, material swatches, sample pack, and specification sheet Small-Pack O-Rings: When to Buy, Measure, or Request a QuoteAssorted O-rings with caliper, technical drawing, and material swatches for repair selection Where to Buy O-Rings for Repair Jobs OnlineMacro industrial photo-style image of a black metric O-ring in a caliper measurement setup Metric O-Ring Size Chart: How to Read ID × CSIndustrial catalog-style AS568 O-ring size reference concept with assorted black O-rings AS568 O-Ring Size Chart: How Dash Sizes WorkO-ring hardness guide showing Shore A ratings, rubber O-rings, and industrial sealing applications O-Ring Hardness Guide: 60A, 70A, 75A, 80A & 90ALeaking O-ring seal on an industrial threaded fitting during troubleshooting Why Is My O-Ring Leaking? Common Causes and Quick ChecksFood grade and FDA O-ring checklist with stainless processing equipment and seal inspection Food Grade and FDA O-Rings: What Small Buyers Should CheckHigh temperature O-rings comparison showing FKM Silicone and FFKM options for heat resistant sealing applications High-Temperature O-Rings: FKM, Silicone, FFKM & PTFEAlt text: O-rings for water pumps plumbing and outdoor equipment with water weather and maintenance use cases O-Rings for Water Pumps, Plumbing, and Outdoor EquipmentO-rings used with hydraulic fittings and pneumatic connectors during equipment repair O-Rings for Hydraulic Fittings and Pneumatic ConnectorsAlt text: FKM versus FFKM O-rings comparison for tougher heat chemical exposure and critical service When to Use FFKM O-Rings Instead of FKMfuel-oil-hydraulic-o-rings-nbr-fkm.png Alt text: O-rings for fuel oil and hydraulic systems showing NBR and FKM material selection cues Best O-Ring Material for Fuel, Oil, and Hydraulic SystemsEPDM vs Silicone O-rings comparison for water steam outdoor and flexible sealing applications EPDM vs Silicone O-Rings: Water, Steam, and Outdoor UseNBR vs FKM O-rings comparison for oil fuel heat and general repair applications NBR vs FKM O-Rings: Which Material Should You Choose?Alt text: Guide image showing how to measure an unknown O-ring size before buying small packs or requesting a quote What to Do If You Don't Know Your O-Ring SizeO-ring size chart guide showing ID and cross section measurement examples O-Ring Size Chart Guide: How to Match ID and Cross Section