Custom NBR O Ring Seal Water Resistant Inside -30°C - +120°C Operating Temperature

ORK Rubber PRODUCTS CO.,LTD offers the seal industry's largest inventory of o-rings, which includes every standard AS568 and ISO 3601 size, and the following:

• Inside Diameter from 0.031 in (0.794 mm) to 26.0 in (66.04cm)
• Outside Diameter from 0.094 in (2.38 mm) to 26.5 in (67.31cm)
• Cross Section from 0.031 in (0.794 mm) to 0.250 in (6.35mm)

In addition to standard imperial and metric sizes, ORK also carries a wide variety of non-standard sizes. With over 8,000 different o-ring sizes in-stock, we have exactly what you are looking for and we can assure immediate delivery of any size in large or small quantities.

O-Ring Sizing Guides

• AS568 Standard O-Ring Sizes 
• ISO 3601 Standard Metric O-Ring Sizes 
• All Standard and Non-Standard O-Ring Sizes

 Still have questions about finding a standard or non-standard o-ring size? Feel free to either contact us

 Easy to Order, Fastest Delivery

When you are ready to get started, submit an online RFQ to receive a quote from our dedicated sales team within 24 hours. Most likely the size and compound you require is in our inventory of over 300 Million o-rings. You receive immediate shipments with no intermediate delays. Remember: With ORK, you buy direct.

 Standard O-Ring Material Applications

 Nitrile (Buna-N) is the most widely used elastomer due to its excellent resistance to petroleum products, operating temperature range (-30°F to +120°F) and one of the best performance-to-cost values. It's an ideal material for aerospace, automotive, propane and natural gas applications. Special Hydrogenated Nitrile (HNBR) compounds can improve resistance to direct ozone, sunlight, and weather exposure while increasing temperature range to +300°F

ASTM D1418 Designation: NBR

ASTM D2000/SAE J200 Type, Class: BF, BG, BK, CH

ORK Compound Designation: BN

Standard Color: Black

Description: Presently the seal industry's most widely used and economical elastomer, Nitrile combines excellent resistance to petroleum-based oils and fuels, silicone greases, hydraulic fluids, water and alcohols, with a good balance of such desirable working properties as low compression set, high tensile strength, and high abrasion resistance.

Key Use(s): Oil resistant applications of all types. Low temperature military uses. Off-road equipment. Automotive, marine, aircraft fuel systems. Can be compounded for FDA applications.

Temperature Range

Hardness (Shore A): 40 to 90.

Features: Comprised of the copolymer butadiene and acrylonitrile, in varying proportions. Compounds can be formulated for service temperature ranging from -85°F to +275°F. Use of Carboxylated Nitrile can have superior abrasion resistance, while still having improved oil resistance.

Limitations: Nitrile compounds are attached by small amounts of Ozone. Phthalate type plasticizers are commonly used in compounding Nitrile Rubber. These plasticizers can migrate out and cause problems with certain plastics. Also, new regulations on certain phthalates have limited their use.