Large O-Rings, No Dimension Limits, No Mould Costs
Produced on the ORINGONE CO.SM.O system, which eliminates limitations related to size and mould costs and does not require minimum purchase quantities or amounts.
Quick answer
The CO.SM.O system can be used with O-ring cross sections of 2.62mm and a minimum internal diameter of 200.00mm. Above that, internal diameters are unlimited and fully customisable, with no mould costs and no minimum purchase.
No dimension limits
Unlimited and fully customisable internal diameters, from a minimum of 200.00mm.
No mould costs
The CO.SM.O system eliminates limitations related to size and mould costs.
No minimum purchase
No minimum purchase quantities and no minimum order amounts.
The CO.SM.O production system
ORINGONE is the benchmark in the large O-ring market. Thanks to the CO.SM.O production system, the result of years of research and continuous updates, O-rings of infinite sizes can be produced, with significant cost reductions and maximum flexibility.
Technical benefits
- Wide range of cords for various applications
- Availability of unlimited and fully customisable internal diameters
- High mechanical performance
- ISO 3601-1 and ISO 3601-3 tolerances
- Extensive selection of certified materials
CO.SM.O and ORINGONE are trademarks of ORINGONE S.r.l. Acumen Seals & Pumps supplies and specifies these O-rings in the UK.
Quality check
ORINGONE participated in the development of the world's first optical measuring machines for large O-rings. This allowed them to be among the first to provide customers with the ability to check the surface defects, internal diameter and cord of the O-rings with extreme precision. The checks performed using optical machines are conducted upon request.
Dimensions
Cross sections available (in mm)
Materials
O-rings are produced in all these materials, with certifications for food use (FDA, 3A Sanitary Standards, USP) available and for AED use (Norsok M710). Take note: for VMQ and CR materials the minimum producible cross section is 5.00mm.
Deciding between FFKM and FKM at this diameter? Read the FFKM vs FKM comparison or the FFKM chemical compatibility chart.
Tolerances
Large O-rings comply with ISO 3601-1 class B and ISO 3601-3 grade N. More restrictive dimensional and defect tolerances according to ISO 3601-1 class A and ISO 3601-3 grade S are confirmed on request.
Delivery
Standard packaging is included in the price. Alternatives carry applicable additional costs.
| Item | Standard, included in the price | Alternative, additional costs |
|---|---|---|
| Box | Blue Box ORINGONE, 400x400x100/200/300 (mm) | Neutral Havana, 400x400x100/200/300 (mm) |
| Bag | WHITE LDPE Anti UV, 500x500 (mm), standard quantity pieces per bag | Clear LDPE Anti UV, 500x500 (mm), or customised quantity as a paid option |
| Label | Standard ORINGONE, 80x90 (mm), custom references without surcharge | Neutral, 80x90 (mm), custom references without surcharge |
Large O-rings, questions answered
What is the largest O-ring diameter available?
There are no dimension limits. The CO.SM.O production system produces O-rings of unlimited and fully customisable internal diameters. The minimum internal diameter is 200.00mm.
Is there a mould cost on a large diameter O-ring?
No. The CO.SM.O system eliminates limitations related to size and mould costs, and does not require minimum purchase quantities or amounts.
What is the minimum cross section?
The CO.SM.O system can only be used with O-ring cross sections of 2.62mm and a minimum internal diameter of 200.00mm. For VMQ and CR materials the minimum producible cross section is 5.00mm.
What cross sections are available?
54 cross sections in millimetres, from 2.62 up to 60.00.
Which materials are available?
VMQ, NBR, HNBR, FKM, FFKM, FEPM, EPDM and CR. Certifications for food use (FDA, 3A Sanitary Standards, USP) are available, and for AED use (Norsok M710).
What tolerances apply?
Large O-rings comply with ISO 3601-1 class B and ISO 3601-3 grade N. More restrictive dimensional and defect tolerances according to ISO 3601-1 class A and ISO 3601-3 grade S are confirmed on request.
How are large O-rings inspected?
Optical measuring machines developed for large O-rings allow the surface defects, internal diameter and cord to be checked with extreme precision. Checks performed using optical machines are conducted upon request.
How are they packed and delivered?
Standard delivery, included in the price, is the Blue Box ORINGONE at 400x400x100/200/300mm, WHITE LDPE Anti UV bags at 500x500mm in standard quantities per bag, and the standard ORINGONE label at 80x90mm with custom references without surcharge. Alternatives with applicable additional costs include the Neutral Havana box, Clear LDPE Anti UV bags, customised bag quantities and neutral labels.
Related reading
FFKM O-Rings
The ORINGONE FFKM EZTRA range, grades and cross references.
FFKM vs FKM
Side by side on temperature, chemistry, cost and failure modes.
Encapsulated O-Rings
PTFE encapsulated rings for near universal chemical resistance.
Kalrez Alternative Cross Reference
Matching an equivalent compound on properties and price.
Send the sizes, get a straight answer
Internal diameter and cross section, or the groove dimensions, and we will quote the correct large O-ring.
Andrew Sykes MCGI, 36 Years in Sealing