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Custom O-Rings & Rubber Seals

As a custom O-ring manufacturer and rubber O-ring supplier, Hongjie produces standard and custom sealing rings for static, dynamic, hydraulic, sanitary, automotive and industrial applications. Materials, dimensions, hardness and inspection requirements can be specified for each project.

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Custom-molded O-rings, gaskets, and seals manufactured to IATF 16949 & ISO standards. Delivering high-reliability components for automotive, medical, and industrial applications.

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Hongjie customizes O-rings and seals by size, material, hardness, temperature, pressure, and media requirements.

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Custom O-Ring

Custom O-Ring Manufacturing Capabilities

Hongjie supplies standard and custom rubber O-rings for industrial, automotive, medical, hydraulic, pneumatic and fluid-control systems. Buyers can submit an AS568, metric or JIS size code, an existing part number, a drawing or a physical sample for quotation.

Our custom O-ring capability covers inner diameters from 0.60 mm to 1000 mm, with cross sections up to 20 mm depending on material, tooling and application requirements. Common customization options include material, color, hardness, size, tolerance, surface finish, packaging method and inspection level.

For new projects, Hongjie can also help review basic sealing conditions before production, including working media, temperature, pressure, groove design, static or dynamic movement and certification requirements. For complex applications, contact our rubber seal engineering support team before confirming the material or tooling plan.

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MATERIAL COMPARISON

O-Ring Material Selection Guide

Compare common O-ring compounds by temperature range, media compatibility, limitations and relative cost. Final selection should also consider pressure, movement, groove design and expected service life.

Rubber Material Comparison
NBR / Nitrile Typical temperature range: -40°C to 120°C. Best for oil, fuel, hydraulic fluid and general industrial sealing. Not ideal for ozone, outdoor aging and strong chemicals. Relative cost: Baseline.
FKM Typical temperature range: -20°C to 200°C. Best for high temperature, fuel, oil, chemicals and harsh environments. Not ideal for low-cost general sealing where NBR is sufficient. Relative cost: High.
EPDM Typical temperature range: -50°C to 150°C. Best for water, steam, weather, ozone and outdoor sealing. Not ideal for petroleum oil and fuel. Relative cost: Medium.
Silicone Typical temperature range: -60°C to 200°C. Best for medical, sanitary, food-contact and clean-use applications. Not ideal for high-wear dynamic sealing. Relative cost: Medium to High.
HNBR Typical temperature range: -40°C to 150°C. Best for automotive AC, oil systems, heat resistance and wear resistance. Not ideal for applications where standard NBR already meets the requirement. Relative cost: Medium to High.

Available Compounds

  • NBR O-Rings for Oil and Hydraulic Sealing

    Choose NBR for cost-effective oil and hydraulic fluid sealing. For compact applications, see Miniature NBR O-Rings.

    –40°C to +120°C Oil Resistant Hydraulic Sealing

  • FKM O-Rings for High Temperature and Chemical Resistance

    Choose FKM for heat, fuel, oil or chemical exposure beyond the practical limits of standard NBR.

    –20°C to +200°C Chemical Resistant High Temperature

  • EPDM O-Rings for Water, Steam and Outdoor Use

    Choose EPDM for water, steam, weather and ozone resistance. Avoid it for petroleum oil and fuel sealing.

    –50°C to +150°C Water & Steam Outdoor Use

  • Silicone O-Rings for Medical and Sanitary Applications

    Choose silicone for clean, medical, sanitary and wide-temperature applications. See Silicone Rubber O-Rings or Bulk Silicone O-Rings.

    –60°C to +200°C Medical Use Sanitary Sealing

  • HNBR O-Rings for Automotive and High-Performance Sealing

    Choose HNBR for automotive AC, heat and wear resistance when standard NBR is insufficient. See Green HNBR O-Rings.

    –40°C to +150°C Automotive Sealing Wear Resistant
O-RING SIZE GUIDE

Standard O-Ring Sizes and Custom Sizes

Hongjie supplies O-rings based on standard dimensions as well as fully customized drawings. Standard sizes are suitable for replacement parts, hydraulic components, pneumatic systems and general equipment assemblies. Custom sizes are used when the sealing groove, product design or working conditions do not match a catalog size.

  • AS568 O-Ring Sizes

    AS568 O-rings are widely used in inch-size hydraulic, pneumatic and industrial sealing systems. If your drawing includes an AS568 code, Hongjie can quote according to the required material, hardness and quantity.

  • Metric O-Ring Sizes

    Metric O-rings are common in pumps, valves, machinery, automotive parts and equipment designed with millimeter-based dimensions. Buyers can provide inner diameter, cross section, outer diameter, material and hardness requirements.

  • JIS B 2401 O-Ring Sizes

    JIS B 2401 O-rings are often used in Japanese-standard machinery, hydraulic systems and industrial components. Hongjie can manufacture JIS-size O-rings based on drawings, samples or standard size references.

  • Custom O-Rings from 0.60 to 1000 mm ID

    Hongjie manufactures miniature and large-diameter O-rings with inner diameters from 0.60 to 1000 mm and cross sections up to 20 mm, depending on material and tooling. Non-standard parts can be developed from drawings or samples. See Custom Rubber O-Rings.

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Static Sealing vs. Dynamic Sealing

Static sealing means the O-ring seals between two parts that do not move relative to each other after assembly. Common examples include flanges, covers, plugs, housings, connectors and fixed valve interfaces. Static seals usually focus on compression, chemical compatibility, pressure resistance and long-term compression set.

Dynamic sealing means the O-ring or seal works between moving surfaces. Examples include pistons, rods, shafts, cylinders, pumps and moving valve components. Dynamic sealing requires more attention to friction, wear, lubrication, pressure changes, extrusion gap and surface finish.

For moving or hydraulic systems, see Hydraulic O-Ring Seals. Applications involving pressure, movement, extrusion risk or aggressive media can be reviewed by our rubber seal engineering team before material and tooling confirmation.

COMPLIANCE OPTIONS

Compliance and Certification Options

O-rings used in automotive, water, food-contact, medical, electrical and industrial applications may require different compliance documents. Hongjie can support material and product requirements according to the selected compound and project conditions.

COMPLIANCE OPTION TYPICAL USE
FDA 21 CFR 177.2600 Rubber articles for repeated food-contact use, depending on compound selection.
NSF/ANSI 61 Drinking water and water-contact sealing applications.
WRAS BS 6920 Potable water-related rubber sealing applications.
REACH Substance control for EU market requirements.
RoHS Restricted substance control for electrical and industrial applications.
ASTM D2000 Rubber material classification and engineering specification control.
rubber O-ring compliance and certification support
APPLICATION GUIDE

O-Rings and Seals for Industrial Applications

Hongjie O-rings and rubber seals help prevent leakage, maintain pressure, resist chemicals, and support reliable sealing performance in equipment assemblies.

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Major Industries
Served Worldwide

  • Automotive & Transportation

    O-rings, sealing rings, lip seals, and rubber seals for engines, fuel systems, transmissions, cooling systems, and vehicle assemblies.

  • Medical & Sanitary Equipment

    Silicone O-rings and custom rubber seals for pumps, valves, diagnostic equipment, sanitary fittings, and clean-use sealing applications.

  • Fluid Control & Industrial Equipment

    Rubber O-rings, Viton seals, piston seals, and double lip seals for hydraulic, pneumatic, valve, pump, and machinery sealing systems.

QUALITY INSPECTION

O-Ring Quality Inspection Options

Inspection plans can be agreed according to the drawing, order quantity and acceptable defect risk. Available options may include AQL sampling, dimensional and hardness checks, visual inspection, approved-sample comparison and 100% automatic Doss machine inspection for projects requiring tighter defect control.

Critical dimensions, appearance limits, material requirements and inspection criteria should be confirmed before sample approval and mass production.

O-RING & RUBBER SEAL FAQS

O-Ring & Rubber Seal FAQs

Answers to common questions about custom O-ring quotation, material selection, sealing conditions, compliance options and bulk order inspection.

What information is needed to quote a custom O-ring?
A drawing, sample or standard size code is helpful. Buyers should also provide material, hardness, working media, temperature, pressure, quantity and certification requirements.
Which O-ring material is best for oil sealing?
NBR is commonly used for oil and hydraulic fluid sealing. For higher temperature, fuel exposure or more demanding media, FKM or HNBR may be more suitable.
What is the difference between static and dynamic O-ring sealing?
Static sealing is used between parts that do not move after assembly. Dynamic sealing is used between moving parts such as pistons, rods, shafts or pumps, so friction, wear and lubrication are more important.
Can Hongjie manufacture non-standard O-ring sizes?
Yes. Hongjie supports custom O-rings based on drawings, samples or application requirements, including miniature O-rings and large-diameter rubber sealing rings.
Can O-rings be made with FDA, NSF, WRAS, REACH or RoHS materials?
Yes, depending on the selected compound and application requirements. Certification needs should be confirmed before quotation.
Does Hongjie support inspection for bulk O-ring orders?
Yes. Hongjie supports AQL sampling inspection and 100% automatic Doss machine inspection for projects that require tighter defect control.

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