Audited Supplier
Comprehensive O-Ring Size & Dimension Charts
Discover the two primary o-ring size categories: standard and metric. Standard sizing is predominantly used in the United States, while metric sizing caters to international standards, further customized for specific regions like Europe and Japan. At Seal & Design, we boast an extensive inventory of these diverse sizes and beyond. No matter the specification, we are equipped to provide virtually any size you require with precision.
Unmatched Service Guarantee
• Our flawless logistics and SAP systems ensure customers receive precise and reliable service guarantees;
• We promise the shortest possible delivery times, thanks to our consistently maintained stock levels.
Our Inventory of Standard O-Rings
| AS 568A USA | BS 4518 England | DIN 3771 Germany | SMS 1586 Sweden |
| AFNOR 47501 France | JIS B2401 Japan | JASO F404 Japan | ISO 3601 International |
Extensive Material List
| Material | Hardness (Shore A) | Temperature | Size | |
| Standard Size | Available | |||
NBR(Buna,Nitrile) FKM(FPM) EPDM Silicone(VMQ) HNBR FFKM(FFKM,Kalrez) | 60-90 70-90 60-90 10-70 60-90 70-90 | -40ºC-110ºC -20ºC-220ºC -45ºC-150ºC -55ºC-204ºC -48ºC-180ºC -18ºC-326ºC | AS-568(USA) JIS-B2401(Japan) DIN-3771(Germany) BS-1516(UK) ISO3601(International) R(France) | ID≤2000mm CS≤40mm |
| Resistance | Color | Certificate | Application | |
Hydraulic Fluid Engine Oil Chemical Ozone Steam & Hot Water Low Temperature High Temperature | Black Brown Red Green White Blue Clear Customized | IS09001 ISO14001 TS16949 RoHS REACH | Auto Industry Construction Machinery Machine Tool Equipment Food Health Water Treatment Chemical Processing Hydraulic Pneumatic Industrial Manufaturing | |
1. What is an O-Ring?
An O-Ring is a circular elastomeric seal with a round cross-section, designed to prevent fluid or gas leakage in mechanical systems. It works by compressing between two surfaces, creating a reliable barrier against contaminants and pressure loss.
2. What materials are available for O-Rings?
We provide high-performance materials compliant with international standards:
- **NBR (Nitrile Rubber)**: Oil-resistant, ideal for automotive and industrial applications.
- **FKM/FPM (Fluoroelastomer/FKM®)**: Resists extreme temperatures (-20°C to +200°C) and chemicals.
- **Silicone (VMQ)**: Non-toxic, flexible, and heat-resistant (-60°C to +230°C), perfect for food, medical, and aerospace industries.
- **EPDM**: Excellent for water, steam, and UV/ozone resistance.
- **PTFE**: Chemically inert, suits aggressive media.
*Custom materials (e.g., FDA/USP Class VI, RoHS, REACH) available upon request.*
3. How to choose the right O-Ring size?
We follow **ISO 3601** and **AS568** standards. Provide us with:
- **Inner Diameter (ID)**
- **Cross-Section (CS)**
- **Application details** (pressure, temperature, media).
*Need help? Our engineers offer free technical support.*
4. What causes O-Ring failure?
Common issues include:
- **Improper installation** (twisting, over-stretching).
- **Material incompatibility** (chemical swelling or degradation).
- **Extreme temperatures/pressure** beyond design limits.
- **Aging** due to ozone/UV exposure.
5. How to ensure proper O-Ring installation?
- Clean grooves thoroughly; remove sharp edges.
- Lubricate with compatible grease (e.g., silicone-based).
- Avoid stretching >5% during assembly.
- Use installation tools for precision.
*Download our installation guide [link] or request training.*
6. Do you offer custom O-Rings?
Yes! We specialize in:
- **Non-standard sizes** (micro to large diameters).
- **Special shapes** (X-rings, square rings).
- **Tailored materials** (anti-static, conductive, low-temperature).
- **Color coding** for easy identification.
*Submit your CAD drawing or specifications for a quote within 24 hours.*
7. What certifications do your products have?
We comply with:
- **ISO 9001:2015** (quality management).
- **FDA, USP Class VI** (food/medical).
- **RoHS/REACH** (environmental compliance).
- **ASTM International** standards.
8. What is your MOQ and lead time?
- **MOQ**: Flexible (from prototypes to bulk orders).
- **Standard products**: 5-7 days.
- **Custom orders**: 2-4 weeks (depending on complexity).
*Express shipping and bonded inventory options available.*
9. How to store O-Rings?
- Keep in original packaging, away from direct sunlight.
- Store at 15-25°C; avoid ozone sources (e.g., motors).
- Shelf life: Up to 10 years for most materials.
10. Why choose us as your O-Ring supplier?
- **Global expertise**: Serving 50+ countries in automotive, oil & gas, and pharmaceuticals.
- **Cost-effective**: Competitive pricing with no compromise on quality.
- **Technical partnership**: Free material selection advice and failure analysis.
- **Logistics excellence**: DDP terms, air/sea shipping, and door-to-door delivery.
11. Do you provide samples?
Yes! Request free samples to test performance in your application.
12. What if I need urgent replacement?
Our 24/7 emergency service guarantees fast-track production and global shipping.
This FAQ highlights technical expertise, compliance, and global service capabilities, aligning with international buyers' priorities. Adjust bold keywords, certifications, or services to match your company's strengths!
