Product Categories / O-Rings

O-Rings

11635 Products
Oil Resistant O-Rings
Oil Resistant O-Rings
Oil-resistant O-rings are designed to provide effective sealing in environments where they are exposed to various types of oils, fuels, and lubricants. They are crucial in applications where oil resistance is essential to prevent leaks and ensure reliable operation.
Chemical Resistant O-Rings
Chemical Resistant O-Rings
These rings are designed to withstand exposure to various chemicals, including acids, bases, solvents, and other aggressive substances. They are essential for applications where chemical compatibility is crucial to ensure effective sealing and prevent leaks.
High Temperature O-Rings
High Temperature O-Rings
These rings are essential components in applications where temperatures exceed the standard operating range of conventional O-rings. They are designed to maintain sealing performance and durability under extreme heat conditions
Water And Steam Resistant O-Rings
Water And Steam Resistant O-Rings
These rings are designed to provide reliable sealing in environments where exposure to water or steam is prevalent. These O-rings can handle the unique challenges presented by moisture and high temperatures.
High Vacuum Fluoroelastomer O-Ring
High Vacuum Fluoroelastomer O-Ring
These O-rings are made from fluoroelastomer, a type of synthetic rubber known for its excellent chemical resistance and ability to maintain sealing performance under challenging conditions.
Oil Resistant O-Ring Cord Stock
Oil Resistant O-Ring Cord Stock
Oil-resistant O-ring cord stock, available in materials like nitrile, fluorocarbon, and silicone, allows for custom-sized O-rings that provide excellent resistance to oils and lubricants for various applications.
Chemical Resistant O-Ring Cord Stock
Chemical Resistant O-Ring Cord Stock
Chemical-resistant O-ring cord stock, made from materials like fluorocarbon or PTFE, is used to create custom O-rings that offer excellent resistance to a broad range of chemicals and harsh environments.
High Temperature O-Ring Cord Stock
High Temperature O-Ring Cord Stock
High-temperature O-ring cord stock, typically made from materials like silicone or fluorocarbon, is designed to create custom O-rings that can withstand extreme temperatures while maintaining effective sealing performance.
Water And Steam-Resistant O-Ring Cord Stock
Water And Steam-Resistant O-Ring Cord Stock
Water and steam-resistant O-ring cord stock, usually made from materials like EPDM or silicone, is used to create custom O-rings that effectively seal in environments with exposure to water and steam.
O-Ring Backup Rings
O-Ring Backup Rings
O-ring backup rings, often made from materials like plastic or metal, are used in conjunction with O-rings to provide extra support, prevent extrusion, and enhance sealing performance in high-pressure or high-temperature applications.

What Are O-Rings?

An O-ring is a torus-shaped elastomer seal that closes the gap between two mating surfaces by compressing into a groove, blocking the passage of liquids, gases, and particulates. LILY Bearing stocks O-rings sized to AS568, ISO 3601, and JIS standards, grouped by the compound each is built from — oil-resistant, chemical-resistant, high-temperature, and water/steam-resistant — plus PTFE backup rings that stop O-rings from extruding under high pressure.

 

Shop O-Rings by Material

Category Common Compound Standard Temperature Range Petroleum Resistance Ozone/Weather Resistance Watch Out For
Oil-Resistant O-Rings NBR (Buna-N) −40°F to +257°F
(−40°C to 125°C)		 Good Poor Not suited to steam, aromatic or chlorinated solvents
Chemical-Resistant O-Rings FKM (Viton) −13°F to +446°F
(−25°C to 230°C)		 Good Good Not suited to hot water, steam, or polar solvents
High-Temperature O-Rings Silicone (VMQ) −85°F to +400°F
(−65°C to 204°C)		 Fair Good Not suited to fuels or aromatic mineral oils
Water and Steam Resistant O-Rings EPDM −40°F to +275°F
(−40°C to 135°C)		 Poor Good Not suited to mineral oils, greases, or fuels
O-Ring Backup Rings PTFE / Nylon Depends on base material — — Not a seal itself — pairs with an O-ring

 

Each compound above is also available as cut-to-length cord stock for custom-sized O-rings. Durometer measures compound hardness on the Shore A scale: softer compounds seal better against rough or imperfect surfaces, while harder compounds resist abrasion and extrusion better under pressure. Sizing follows AS568 (inch), ISO 3601 (metric), or JIS conventions depending on the equipment being sealed.

 

Where Are O-Rings Used?

  • Hydraulic and pneumatic systems
  • Automotive engines, fuel systems, and transmissions
  • Plumbing, HVAC, and water treatment equipment
  • Food and beverage processing equipment
  • Medical and laboratory equipment
  • Industrial pumps, valves, and compressors

 

Frequently Asked Questions

How do I choose the right O-ring material?

Match the compound to what the seal will contact first: NBR for oil and fuel, FKM for aggressive chemicals, silicone for sustained heat, and EPDM for water or steam. Then confirm the compound's temperature rating covers your operating range with margin.

 

Do backup rings need to be ordered separately from the O-ring?

Yes — backup rings are stocked separately since they're only needed when system pressure or dynamic motion risks extruding the O-ring into the clearance gap. They don't seal on their own and are typically paired with NBR or FKM O-rings in hydraulic applications.

 

Can one O-ring compound handle both oil and steam exposure?

Not reliably — NBR degrades in steam service, and EPDM swells in petroleum oils, so no single common compound covers both well. If an application sees both media, size the seal around the more demanding exposure or use two different seals in sequence.

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