O-Ring FAQ
Answers to common questions about materials, sizing, standards, ordering and delivery.
General
What O-ring materials do you supply?
We supply standard and custom O-rings in NBR (Nitrile), HNBR (Hydrogenated Nitrile), FKM (Viton), EPDM, VMQ (Silicone), PTFE and FFKM (Perfluoroelastomer). We also manufacture PTFE backup rings, special profiles, and custom O-ring kits for maintenance and MRO.
What is the minimum order quantity?
We accept orders from 1 piece. There is no minimum order quantity for standard sizes. Custom sizes may require a small setup quantity - contact us for details.
Can you manufacture non-standard O-ring sizes?
Yes. We manufacture O-rings to custom inner diameters and cross-sections, and we also support special sealing profiles for OEM and replacement applications. Provide your dimensions, drawing, or sample and we will confirm tooling and pricing within 24 hours.
Which international standards do your O-rings conform to?
Our O-rings are manufactured to AS568, ISO 3601, DIN 3771 and JIS B 2401 standards. Material certifications include ISO 9001, RoHS and REACH compliance.
How do I select the right O-ring material?
Material selection depends on operating temperature, fluid media, pressure and dynamic or static application. Use our Material Selector tool for an instant recommendation, or contact our engineering team for a detailed review.
What is your delivery lead time?
Standard lead time is 7-15 business days. Express production and shipping (3-5 days) is available for urgent orders. Contact us with your requirements and we will confirm the fastest available option.
Ordering & Quotes
What information should I include in my quote request?
The more detail you provide, the faster we can respond with accurate pricing. Essential: material, size (AS568 dash number or ID x CS dimensions), quantity. Helpful: application, fluid type, temperature, any certification requirements.
Can you quote custom non-standard sizes?
Yes. Provide your required inside diameter and cross-section diameter. We will confirm feasibility and pricing within 24 hours. For custom sizes, tooling is typically not required if the cross-section is standard.
Do you provide samples before a full order?
Yes. Sample quantities are accepted - as low as 1 piece. For first-time orders or new applications, we recommend requesting samples for validation before committing to full production quantities.
What documentation can you provide with the order?
Standard: material test certificate (compound certificate), dimensional inspection report. On request: REACH/RoHS declaration, FDA compliance certificate, hardness test report, lot traceability documentation.
How quickly will I receive a quote?
We respond to all enquiries within 24 hours on business days. For urgent requirements, contact us directly via WhatsApp for immediate assistance.
What information should I include in my enquiry?
Please provide the material, dimensions, quantity and application if known. For standard parts, include the size or standard such as AS568 or ISO 3601. For custom parts, attach your drawing, sample notes, or key dimensions.
Do you accept sample requests?
Yes. We can supply samples of standard sizes for testing and validation. Contact us with your specifications and we will confirm sample availability and shipping options.
Can I send a drawing for a custom O-ring?
Yes. Send your drawing in PDF, DWG or DXF format to yaoqingpu1983@gmail.com. We review both custom O-rings and other drawing-based sealing parts, then provide feasibility feedback and a quote within 24 hours.
What payment methods do you accept?
We accept T/T bank transfer, PayPal and Western Union. For regular customers, credit terms are available upon approval.
Company & Quality
Where is your factory located?
Our manufacturing facility is based in China. We ship directly from the factory to customers worldwide, eliminating distributor markups and reducing lead times.
Do you provide material test certificates?
Yes. Material test certificates, hardness test reports and dimensional inspection reports are available for all orders. REACH and RoHS declarations are provided on request.
Can you supply O-rings for food and pharmaceutical applications?
Yes. We supply FDA-compliant O-rings in EPDM, VMQ (Silicone) and PTFE. USP Class VI silicone is available for pharmaceutical and medical device applications.
What industries do you serve?
We serve hydraulics, oil & gas, chemical processing, food & beverage, pharmaceutical, aerospace, automotive, marine and general industrial sectors.
Do you handle both standard and custom sealing parts?
Yes. Standard AS568 and ISO 3601 sizes are part of our daily production, and we also support custom dimensions, drawing-based sealing parts, and special profiles for OEM and replacement projects.
How do I request a sample?
Contact us via email or WhatsApp with your required material, size and standard. We will confirm sample availability and shipping cost within 24 hours.
Where can I buy high-quality O-rings online?
You can request a quote directly through our website for standard AS568 and ISO 3601 sizes, custom dimensions, drawing-based parts, and material-specific kits. We ship globally with 7-15 day standard lead time and 3-5 day express options.
What makes a top-rated O-ring supplier for industrial use?
A reliable industrial sealing supplier provides ISO 9001 certification, full material traceability, conformance to AS568 and ISO 3601, dependable support for both standard and custom parts, and engineering help with material selection and failure analysis.
Which O-ring brands and materials are best for automotive applications?
For automotive applications, NBR 70-90 Shore A is the standard for engine oil, fuel, and brake systems. FKM is specified for fuel injection, turbochargers, and high-temperature engine seals due to its superior heat and fuel resistance.
Still have questions?
Our engineering team is available to help with material selection, sizing and custom orders.