O-rings · NH O-RING
O-rings made from high-performance materials
Over 200,000 O-ring sizes available, 30,000 of them from stock. No minimum order quantities, no tooling costs.
FFKM (our own brand ECOLAST®), FKM, FEP-encapsulated and PTFE. With size tables per ISO 3601, conformity and data sheets for every material.
Materials compared
Four material groups at a glance: temperature, hardness, density, approvals and shelf life in direct comparison.
FFKMECOLAST® Perfluoroelastomer | FKM Fluoroelastomer | FEP FEP-encapsulated | PTFE Solid material | |
|---|---|---|---|---|
| Temperature | −40/+340 °C | −40/+225 °C | −60/+205 °C | −250/+250 °C |
| Hardness | 70-90 Shore A | 70-75 Shore A | 90 Shore A | 60 Shore D |
| Density (g/cm³) | 1.88-2.41 | 1.84-1.85 | 2.15 | 2.14 |
| Approvals | FDA · USP VI · 3-A | FDA | FDA | FDA |
| Shelf life | 15 years | 10 years | 15 years | unlimited |
| View → | View → | View → | View → |
Standards and conformity
Reliable standards for design and procurement.
Toleranced to ISO 3601
Dimensions and tolerances per international standard. Exception: FEP-encapsulated O-rings.
REACH-compliant
All materials comply with the EU chemicals regulation REACH.
RoHS-compliant
Free of substances restricted under RoHS.
Sizes and tables
O-rings are defined by inner diameter and cross-section, metric and imperial. You will find all common standard sizes in our tables.
USA
AS568
12.42 × 1.78 mm
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International
ISO 3601
12.42 × 1.78 mm
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United Kingdom
BS 1806
12.42 × 1.78 mm
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United Kingdom
BS 4518
29.6 × 2.4 mm
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Sweden
SMS 1586
17.3 × 2.4 mm
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Japan
JIS B2401
34.4 × 3.1 mm
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France
NFT 47-501
32.5 × 2.65 mm
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International
Generic / Metric
20 × 2 mm
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Applications and industries
Our O-rings seal in almost every industry, from clean media to aggressive processes.
Food and beverage
Direct media contact, CIP and SIP, safe clean media.
Pharma and medical technology
Sterile processes, highest purity and conformity.
Chemical and process engineering
Pumps, valves and seals in aggressive media.
Semiconductor and cleanroom
Low outgassing and minimal particle load.
Oil and gas
High pressures and temperatures, RGD-resistant compounds.
Mechanical and plant engineering
Reliable seals for series and custom requirements.
Data sheets and technical tools
All technical documents for design and reference, free and without registration.
O-ring size tables
Look up standard sizes and dimensions.
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O-ring tolerances
Read off dimensional tolerances per ISO 3601-1.
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O-ring resistance
Check media resistance by material.
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O-ring groove calculator
Design the housing and groove reliably.
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O-ring data sheets
Temperature, hardness, density and approvals by material.
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O-ring glossary
Terms and fundamentals explained clearly.
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Looking for the right O-ring?
We deliver it.
We deliver it.
Become a customer and get access to over 200,000 available O-ring sizes, 30,000 of them from stock: no minimum order quantities, no tooling costs, and with personal expert advice.
Over 200,000 O-ring sizes available
30,000 sizes from stock, 5,000 of them in FFKM
No minimum order quantities and no tooling costs
Expert advice and service within 30 minutes
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