Factory custom 90A shore A FKM (Viton®) O-Rings

FKM (Viton®) O-Rings

FKM (Viton®) O-Rings for high temperature & chemical harsh conditions. Excellent resistance to hot oil, fuel, hydraulic fluid and hydrocarbon solvents. AS568 / metric sizes, compression molded FKM o-rings for automotive, oil & gas, aerospace and chemical equipment seals.

We supply standard sizes following AS568, ISO3601, DIN3771, JIS B2401, as well as custom-molded O-rings with custom ID, OD and cross-section. Hardness options range from 60 ~ 90 Shore A; 70 Shore A black FKM is our most popular stock grade.

Product Specifications

O-Ring Specific Tolerance Table

This sheet covers dimensional tolerance specifications for both custom molded and standard O‑rings, including inner diameter and cross‑section.

We set tolerance grades in accordance with ISO 3302‑1. For O‑rings with an inner diameter exceeding 670 mm, the tolerance is 0.64% of the inner diameter. Multiple precision classes are available to suit general industrial, hydraulic and high‑demand sealing applications.

All tolerance documentation can be supplied for your incoming inspection, supplier audits and drawing reference. Tighter tolerances can be negotiated for special high‑precision projects

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Rubber material date sheet:

We can provide complete physical test reports according to your material requirements, including hardness, tensile strength, elongation, compression set, temperature range and chemical resistance.

We are able to supply COA, COC and compliance documents for REACH, RoHS, FDA and UL. Batch traceability is guaranteed for custom molded sealing parts

Your Trusted Supplier of Molded Rubber Products

Xiamen Lead Rubber & Plastic Industry Co., Ltd. is a professional factory focused on the design and fabrication of rubber & plastic molds, as well as custom molded rubber and plastic components.

We specialize in exporting O-rings, rubber gaskets, various rubber seals, rubber bumpers, molded plastic parts, precision tooling molds and other custom molded products.

Our in-house mold workshop develops custom molds for a wide range of rubber and plastic materials. We design and manufacture tooling strictly according to customers’ 2D/3D drawings, samples and technical specifications.

We provide full one-stop OEM & ODM solutions for global buyers, covering mold development, material formulation, prototyping, mass production and quality inspection. Our products widely serve automotive, hydraulic, pneumatic and general industrial sealing applications.

Rubber O-Ring and Gasket Seal Manufacturing | Custom molded products

Lead Rubber is a professional manufacturer specializing in custom molded rubber sealing components and mold fabrication.

We mainly export standard Size O-Rings and custom rubber O-rings, gaskets, various rubber seals, rubber bumpers, precision molds and other custom molded rubber & plastic parts.

We develop custom molds for a wide range of rubber and plastic materials based on customers’ drawings, samples and technical requirements. We deliver one-stop OEM & ODM custom sealing solutions for global buyers.

OEM Services and Mold Development

Lead rubber  offers full OEM development for custom molded rubber O-rings, gaskets and seals, plus custom plastic components.

Following your drawings, samples or technical specifications, we manufacture tailored sealing parts with our in-house mold workshop covering mold design, CNC machining, trial testing and validation.

We support multiple materials including NBR, EPDM, FKM, Silicone and engineered plastics. Our engineering team collaborates with you for prototype sampling and mass production tooling to balance quality, lead time and cost.

Quality Control and Testing for rubber oring

Lead rubber enforces strict QC throughout rubber O-ring manufacturing, from raw material incoming check to finished goods inspection before shipment.

Our laboratory is equipped with hardness tester, projector, micrometer, compression set tester and tensile tester. We conduct visual inspection, dimensional measurement, Shore A hardness, compression set and tensile strength tests.

Material certificates and batch inspection reports are available upon request to guarantee consistent sealing performance.

Packaging and Delivery Preparation

Lead Rubber offers packaging options for international shipments, including PE bags, export carton, and palletized packaging where required. Customized packaging, logo printing, and product labeling can be discussed according to order quantity and customer requirements.

Packaging methods are selected according to the product type, shipment method, and destination requirements. Please confirm any special packaging or labeling instructions before placing an order.

Frequently Asked Questions

Q1: What is FKM (Viton®)?

A: FKM, commonly known as Viton®, is a high-performance fluoroelastomer. It features excellent resistance to high temperature, mineral oil, fuel, hydraulic fluid and many hydrocarbons for critical sealing.

Q2: What temperature range can FKM O-rings work at?

A: Typical working range: -20°C ~ +200°C. Special low-temperature FKM grades can reach down to -40°C.

Q3: What media are NOT suitable for standard FKM?

A: Standard FKM is incompatible with ketones, esters, amines, hot steam and low-molecular-weight acids. Special FKM formulations are required for these conditions.

Q4: What sizes of FKM O-rings do you supply?

A: We offer standard sizes to AS568, ISO 3601, DIN 3771, JIS B2401, plus custom molded O-rings with non-standard ID, OD and cross-section.

Q5: What hardness options are available?

A: 60 / 70 / 75 / 80 / 85 / 90 Shore A. 75 Shore A black general-purpose FKM is our most popular stock grade.

Q6: Can you provide material certificates?

A: Yes. Material test reports, compliance documents (RoHS, REACH) and FKM datasheets can be provided upon request.

Q7: Where are FKM O-rings mainly used?

A: Widely used in automotive fuel systems, oil & gas equipment, aerospace components, chemical pumps, hydraulic valves and high-temperature industrial machinery.

Q8: What is the difference between FKM and NBR?

A: FKM has much better heat and chemical resistance than NBR. NBR is cost-effective for medium-temperature oil sealing, while FKM is selected for harsh high-temperature and aggressive fluid environments.

Request a Quote for rubber oring

Looking for standard or custom rubber O-rings, gaskets and molded rubber seals for automotive & industrial applications? Contact Lead Rubber with your specifications.

Please submit 2D/3D CAD drawings or physical samples, dimensions, rubber material, hardness, quantity, application and special performance requirements for quotation. If custom mold tooling is needed, also advise cavity quantity and mold steel preferences.

Contact Person: Sunny                              
Tel: 0086-13400616316   
WhatsApp: 0086-13400616316
Email: sales1@leadindustryproducts.com

Contact Person: Lucy

Tel: 0086-13328793979

WhatsApp: 0086-13328793979

Email: sales4@leadindustryproducts.com

Contact Person: Nana

Tel: 0086-15872688050

WhatsApp: 0086-15872688050

Email: sales2@leadindustryproducts.com

Pricing Notice: The displayed price is for reference only. The final quotation depends on product design, material selection, dimensions, tooling requirements, order quantity, surface treatment where applicable, and packaging specifications.