simmering.pl supplies O-rings to manufacturers, industrial companies, maintenance departments, technical distributors and B2B customers. The range includes NBR, FKM/FPM, EPDM and VMQ O-rings in a wide selection of metric sizes. Many smaller sizes are also available in packs of 100 and 1,000 pieces, making them suitable for repetitive manufacturing requirements and industrial purchasing. Products are shipped from stock in Poland.
For a manufacturer using O-rings as components in its own products, the unit price is only one part of the purchasing decision. Correct dimensions, elastomer material, hardness, operating conditions, repeatability and reliable availability for subsequent production batches are equally important.
For this reason, selecting an O-ring for manufacturing should start with a clear technical specification.
O-Rings for Manufacturers - How Production Purchasing Differs from Maintenance Purchasing
A maintenance customer may need several O-rings to repair a machine. A manufacturer may require hundreds, thousands or tens of thousands of identical O-rings for continuous production.
This changes the purchasing process.
For mass production and OEM supply, important parameters include:
- exact O-ring dimensions,
- elastomer material,
- hardness,
- compatibility with the operating medium,
- operating temperature,
- static or dynamic operating conditions,
- quantity per order,
- estimated annual consumption,
- repeatability between production batches,
- availability for recurring orders.
An O-ring with the correct dimensions may still be unsuitable if its elastomer is incompatible with the medium or operating conditions.
O-Rings for Mass Production
O-rings are used as sealing components in a very wide range of industrial products and assemblies.
Depending on the design, O-rings may be used in:
- pumps,
- valves,
- cylinders,
- manifolds,
- industrial fittings,
- hydraulic components,
- pneumatic systems,
- machinery,
- industrial equipment,
- mechanical assemblies,
- fluid systems,
- gas systems.
These are typical applications for O-rings as a sealing technology. Suitability of a specific O-ring must always be determined according to its dimensions, material and the requirements of the application.
How Are O-Ring Dimensions Specified?
Two fundamental dimensions are commonly used to identify an O-ring:
ID - inside diameter
and
CS - cross-section diameter
For example:
O-ring 20x2 mm
means an O-ring with a 20 mm inside diameter and a 2 mm cross-section.
For an O-ring 40x3 mm:
- ID = 40 mm
- CS = 3 mm
For purchasing departments, engineers and manufacturers, specifying the dimensions as ID x CS provides a simple and precise way to identify the required seal.
NBR O-Rings for Manufacturers and Industry
NBR, or nitrile butadiene rubber, is one of the most widely used elastomers for technical O-rings.
NBR O-rings are commonly used in engineering applications due to their useful mechanical properties and resistance to many oils and greases.
However, compatibility with the actual operating medium and conditions must always be checked.
For production purchasing, the specification should normally include at least:
dimensions + material + hardness
For example:
O-ring NBR 20x2 mm 70 ShA
This allows a purchasing department to source a defined technical component rather than simply searching for an "O-ring 20x2".
FKM/FPM O-Rings for Demanding Applications
FKM/FPM refers to fluoroelastomers used for seals where suitable chemical and thermal resistance is required.
FKM/FPM O-rings are often considered for applications where standard NBR does not meet the technical requirements.
However, FKM is not automatically the best material for every application.
O-ring material should be selected according to factors such as:
- operating medium,
- temperature,
- pressure,
- type of movement,
- groove design,
- required service life,
- environmental conditions.
In mass production, changing from NBR to FKM/FPM or from FKM/FPM to NBR should be treated as a technical engineering decision rather than simply a purchasing substitution.
EPDM O-Rings
EPDM is another important elastomer used for technical sealing applications.
Depending on the specific compound and application parameters, EPDM is used in selected water, steam and chemical environments.
When specifying an EPDM O-ring for a manufactured product, compatibility between the elastomer and the actual operating medium must be verified.
An EPDM O-ring should not be considered interchangeable with an NBR or FKM O-ring simply because the dimensions are identical.
VMQ Silicone O-Rings
VMQ, commonly referred to as silicone rubber, is used for O-rings where the properties associated with silicone elastomers are required.
Again, dimensions alone are not sufficient for technical selection.
If the engineering documentation specifies a VMQ O-ring, substitution with NBR, EPDM or FKM should only be considered after evaluating the operating conditions and technical requirements.
NBR, FKM, EPDM or VMQ - Which O-Ring Material Should You Choose?
There is no single O-ring material suitable for every application.
| Material | Material group | Typical direction of use |
|---|---|---|
| NBR | Nitrile butadiene rubber | General engineering applications, many oils and greases |
| FKM/FPM | Fluoroelastomer | Demanding chemical and thermal environments |
| EPDM | Ethylene propylene diene rubber | Selected water, steam and chemical applications |
| VMQ | Silicone rubber | Applications requiring silicone elastomer properties |
This table is a general guide only. Final selection should be based on the specific elastomer compound and actual operating conditions.
Bulk O-Rings - Packs of 100 and 1,000 Pieces
For repetitive manufacturing requirements, purchasing individual O-rings is often inefficient.
For this reason, many smaller O-ring sizes at simmering.pl are offered in 100-piece and 1,000-piece packs.
Bulk packs are particularly useful for:
- manufacturers,
- assembly plants,
- repetitive production,
- maintenance departments,
- industrial workshops,
- service companies,
- technical purchasing departments.
For regular consumption, it is useful to compare not only the pack price but also the unit price per O-ring.
When thousands of seals are consumed annually, even a small difference in unit cost can have a measurable impact on the total component cost of the finished product.
OEM O-Rings
A manufacturer using an O-ring as a component of its own product needs consistent and unambiguous component identification.
The purchasing specification should therefore be as precise as possible.
Instead of:
"20 mm rubber O-ring"
a much better specification is:
O-ring NBR 20x2 mm 70 ShA
If the application requires additional properties, these should also be included in the technical specification or request for quotation.
This allows the purchasing department to source the component defined by the engineer rather than selecting a visually similar seal.
O-Rings for Machinery and Equipment Manufacturers
A single machine may contain many different O-rings.
Depending on the design, separate O-rings may seal:
- housings,
- ports,
- valves,
- pistons,
- covers,
- fittings,
- fluid channels,
- hydraulic components,
- pneumatic components.
Manufacturers using multiple O-rings can benefit from maintaining an internal seal specification containing:
dimensions - material - hardness - quantity per machine - estimated annual consumption
This simplifies purchasing and helps reduce the risk of confusing similar-looking seals.
O-Rings for Pumps
Pumps are a common application for O-ring sealing.
However, the phrase "O-ring for pump" is not sufficient to identify the correct seal.
The engineer should consider factors including:
- pumped medium,
- temperature,
- pressure,
- installation position,
- static or dynamic operation,
- materials of the mating components.
Only after these conditions have been established can the appropriate O-ring material and dimensions be selected.
O-Rings for Valves and Industrial Fittings
O-rings are frequently used to seal connections and functional components in valves and industrial fittings.
Compatibility between the elastomer and the fluid or gas passing through the device is particularly important.
NBR, FKM, EPDM and VMQ O-rings with identical dimensions can behave very differently when exposed to a specific medium.
For this reason, the elastomer material should always remain part of the production specification.
O-Rings for Hydraulic Systems
In hydraulic applications, O-ring selection depends on the sealing arrangement, hydraulic fluid, pressure, temperature and operating conditions.
Not every O-ring with the correct diameter is suitable for every hydraulic application.
When an O-ring forms part of an engineered product, the parameters specified by the designer or technical documentation should be followed.
O-Rings for Pneumatic Systems
O-rings are also widely used in pneumatic systems.
Depending on the design, they may operate in static joints or in components involving movement.
Selection should take into account groove geometry, elastomer material and actual operating conditions.
Metric O-Rings by Size - Fast Identification for Purchasing Departments
For purchasing departments, one of the simplest search methods is to combine the dimensions with the material.
Typical searches may include:
O-ring NBR 20x2 mm 70 ShA
O-ring NBR 25x3 mm
O-ring FKM 40x3 mm
O-ring EPDM 30x2 mm
O-ring VMQ 15x2 mm
The more precise the specification, the lower the risk of purchasing an unsuitable seal.
How to Prepare an RFQ for O-Rings
A well-prepared request for quotation makes it easier to identify the correct product and determine availability.
Where possible, provide:
- O-ring dimensions as ID x CS
- material, such as NBR, FKM/FPM, EPDM or VMQ
- required hardness
- quantity required per order
- estimated annual consumption for repetitive production
- required standards or documentation, where applicable
- operating medium and conditions if technical selection assistance is required
For example:
O-ring 18x2 mm, NBR 70 ShA, quantity 5,000 pcs per order, estimated annual requirement 20,000 pcs.
This provides considerably more useful information than simply asking for the price of an "18 mm O-ring".
How to Calculate Annual O-Ring Requirements
Manufacturers can estimate annual consumption relatively easily.
If one product contains four identical O-rings and annual production is 2,500 units:
4 x 2,500 = 10,000 O-rings per year
An appropriate production and inventory reserve should then be added according to the company's own material planning requirements.
Knowing annual consumption makes it easier to plan purchasing quantities and replenishment.
Recurring O-Ring Supply for Manufacturing
Supply continuity becomes increasingly important in repetitive manufacturing.
If the same O-ring is installed in every finished product, a shortage of a low-cost seal can interrupt the assembly of a much more valuable machine or component.
Manufacturers should therefore know:
- monthly consumption,
- annual consumption,
- minimum safety stock,
- standard purchasing quantity,
- expected replenishment requirements.
This means treating the O-ring not merely as an inexpensive rubber component, but as part of production material planning.
Do Identical O-Ring Dimensions Mean Interchangeability?
No.
Two O-rings may have identical dimensions while differing in:
- elastomer material,
- hardness,
- physical properties,
- compatibility with the operating medium,
- temperature behaviour,
- regulatory or technical requirements.
Dimensions are therefore only the first stage of identification.
For manufacturing applications, the complete technical specification defined for the product should be maintained.
Why Standardise O-Rings in Manufacturing?
Where permitted by the engineering design, reducing the number of different O-ring dimensions and materials can simplify inventory management.
Fewer component references can simplify:
- purchasing,
- warehousing,
- production picking,
- inventory control,
- component identification,
- purchasing forecasts.
However, O-ring standardisation must remain an engineering decision. Dimensions, material or hardness should not be changed solely to simplify purchasing without technical approval.
simmering.pl - Industrial O-Ring Supplier from Poland
simmering.pl specialises in technical sealing solutions and components for manufacturers, industrial companies, maintenance departments, service businesses and B2B customers.
The O-ring range includes numerous combinations of:
- inside diameters,
- cross-sections,
- elastomer materials,
- hardness values,
- pack quantities.
Available materials include NBR, FKM/FPM, EPDM and VMQ.
Many smaller metric O-rings are available in 100-piece and 1,000-piece packs, making them particularly suitable for recurring production and industrial consumption.
Orders are shipped from stock in Poland. simmering.pl supplies customers in Europe and offers worldwide shipping.
FAQ - O-Rings for Manufacturers and Industry
How can I order O-rings for mass production?
Provide the ID x CS dimensions, elastomer material, hardness and required quantity. For recurring production, estimated monthly or annual consumption is also useful.
How are O-ring dimensions specified?
O-rings are commonly identified by inside diameter ID and cross-section CS. An O-ring 20x2 mm has a 20 mm inside diameter and a 2 mm cross-section.
Can I buy O-rings in packs of 100 or 1,000 pieces?
Yes. Many smaller O-ring sizes at simmering.pl are available in packs of 100 and 1,000 pieces, suitable for manufacturers, service companies and maintenance departments.
Should I choose NBR or FKM O-rings?
The correct choice depends on the operating medium, temperature, pressure and other application conditions. One material should not be substituted for another solely because the dimensions are identical.
Are FPM and FKM the same type of elastomer?
FPM and FKM are designations associated with fluoroelastomers and occur in different nomenclature systems. The actual material specification of the particular O-ring should still be checked when selecting a component.
Is an O-ring with the same dimensions always interchangeable?
No. O-rings with identical dimensions can have different materials, hardness values and operating properties. Complete technical specifications should be compared.
What information should a manufacturer specify when ordering O-rings?
At minimum, specify dimensions, elastomer material and hardness. Medium, temperature, pressure, operating conditions and groove design should also be considered where relevant.
What information should I include in a bulk O-ring RFQ?
Include the exact dimensions, material, hardness, order quantity and estimated annual consumption. If applicable, also provide technical, regulatory or documentation requirements.
O-Rings for Mass Production - Key Information
O-rings for manufacturing should be selected according to ID x CS dimensions, elastomer material, hardness and actual operating conditions. NBR, FKM/FPM, EPDM and VMQ are not automatically interchangeable. For mass production, pack quantity, annual consumption and supply continuity are also important. simmering.pl supplies industrial and B2B customers from stock in Poland with worldwide shipping.