O-Ring Compression Set

The biggest reason of O-ring failure is compression set. An effective O-ring seal requires a continuous “seal line” between the sealed surfaces. The establishment of this “seal line” is a function of gland design and seal cross-section which determines the correct amount of squeeze (compression) on the O-ring to maintain seal integrity without excessive deformation of the seal element.

The following suggestions may improve the rate of compression set:

1. Use “Low Compression Set” O-ring material whenever possible.

2. Select O-ring material compatible for the intended service conditions (a material with higher temperature capability or greater chemical resistance).

3. Reduce the system operating temperature.

4. Check frictional heat build-up at seal interface and reduce if excessive.

5. Verify groove dimensions are consistent with recommended Parker practices


For further Information
Website - https://www.fitcorings.com
Email - fitco@fitcorings.com

O Ring Tolerence Chart

Fitco are oring provider since 1995, We have in-house manufacturing and worldwide manufacturing partners for supply all size oring and seals according to international standard: AS 568, ISO 3601, DIN 3771, JIS B2401. We are exporting o-ring worldwide and supply in various materials.

O-Ring is selected as the bore or rod/shaft diameter and housing dimensions in both metric and inch size, so you know exactly which part you need. 

Standard O Rings Cross section widely used 

BS 1806  BS ISO 3601-1 SAE AS 568	Aerospace sizes to  BS ISO 3601-1	BS 4518	Inch sizes
0.070" 1.78mm	0.071" 1.80mm	1.6mm	0.063"
0.103" 2.62mm	0.104" 2.65mm	2.4mm	0.094"
0.139" 3.53mm	0.140" 3.55mm	3.0mm	0.125"
0.210" 5.33mm	0.209" 5.30mm	5.7mm	0.188"
0.275" 6.99mm	0.276" 7.00mm	8.4mm	0.250"

ISO O Rings Tolerance Chart

Fitco O Rings Tolerence Chart

For further details : fitco@fitcoseals.com
https://www.oringstore.com

Sealing Materials for O-Rings ,Oil Seals, Hydraulic Seals

Material of O Ring plays an important role in increasing performance & its life in any particular application.

Two things are equally important for reliable performance of an O Ring , the right size and the right material.

Sealing Materials for O-Rings ,Oil Seals, Hydraulic Seals

• Polyurethane (P.U)
• EPDM Rubber
• Fluorinated Rubber FKM(Viton)
• PTFE/ Glass Filled PTFE
• Nitrile Rubber (NBR)
• Silicone Rubber
• Poly Acrylic Rubber
• PTFE/ Bronze filled PTFE
• H-NBR Rubber
• Polychloroprene Rubber (C R)
• PTFE / VIRGIN
• PTFE/GRAPHITE filled PTFE

Since 1995 in supply of O Rings & Seals.

Extensive stock range, Knowledge and expertise, Fast and Efficient.

Contact for all your sealing needs.

Fitco Engineers Pvt Ltd

Bandra West ,Mumbai 400050, India

Mfg of O Rings , Seals, Silicone Rubber Extrusions, PTFE Parts

Email :  sales@fitcoseals.com  Web: fitcoseals.com / oringstore.com

www.oringstore.com - Largest O Ring Seal range from Small to Large Diameter  

O-Ring Kit - Inch sizes of o rings

We have variety of O-Ring kits of UK and US standard sizes

O Ring Kits contains the most often used Imperial sizes of AS-568 standard size O-Rings , our O-Ring Kit is industry standard. O-Ring kit contains 30 sizes of o-rings in total quantity 382 pieces of o-rings of the most often used AS568 Standard sizes. The outside top cover has detailed, labels indicating the sizes and quantities of the o-rings in each compartment , and the highly attractive red styrene box features both post and recess styles of o-ring retention.

Fitco O-Ring Kits

Material : Nitrile (NBR) with 70 Shore A Hardness
Orders are shipped from our stock within 3-5 days .

For Further Details Email us : sales@fitcoseals.com
www.fitcoseals.com
www.oringstore.com

Miniature O-rings, large special O-rings, continuously moulded and spliced cord - O-Ring Store

We supply O-Rings to Distributors, MROs, OEMs, designers, engineers, maintenance staff and plant operators.

FITCO are a leading supplier of O-rings and Seals from last 23 years established since 1995 - our warehouse is located in Mohali & Mumbai

O-Rings  - Manufactured to US and international standards: AS 568B, ISO 3601, DIN 3771, JIS and metric. Custom sizes of almost any dimension. 
 

 

O-Rings

Back-up Rings - Prevent extrusion in high-pressure applications and help retain lubricant, extending O-ring life.

O-Ring Kits - Kits are conveniently arranged with various size O-rings for repair, assembly and workshop.

Accessories - Products to assist O-ring users include assembly sizing cones and extraction tools.


Compounds - O-rings can be molded in a wide range of compounds in hardnesses from 60 to 95 Shore A. These materials include:

• Acrylonitrile-Butadiene (NBR) • Butyl (IIR) • Chloroprene (CR) • Ethylene Acrylic (AEM) • Ethylene Propylene (EPDM) • Fluorocarbon (FKM) • Fluorosilicone (FVMQ) • Hydrogenated Nitrile (HNBR) • Perfluoroelastomer (FFKM) • Polyacrylate (ACM) • Silicone (VMQ)

Let us know for your requirement of O-Rings

For Details visit us :

sales@fitcoseals.com

www.fitcoseals.com

www.fitcoseals.com

O-Rings Design Guidelines, Specifications - FITCO

O-Rings are one-piece molded objects made from elastometric seal with a circular cross-section. They are used to prevent fluid movement between mechanical parts by maintaining contact with the inner and outer walls enclosing the ring. The resiliency of the rubber provides a zero-pressure seal. When pressure is applied, the fluid forces the O-Rings across the groove and causes more deformation. This leads to the ring flow up to the fluid passage and seal it against leakage. O-Rings are an example of self-energize seals, meaning they relay pressure inside the container (or pipe) to give them the pressure necessary to form the seal. O-Rings are inserted into cavities called glands, and they are used in either axial or radial seal designs. An O-Ring is described by its inner diameter, its outer diameter, its material hardness  (or durometer) and its material composition. Dimensions of O-Rings are given in ANSI/SAE AS568A. A seven-digit number is assigned to each ring to designate the ring size and their composition. The first three digits are standardized and they specify the ring size. However, different manufacturer use different system to specify the composition. For this reason, the ANSI/SAE AS568A only publishes the first three digits for dimension specification. When installed, an O-Ring compresses and deforms slightly into the free space within the grove to from a proper seal. The ring's cross-section is approximately 20 percent greater than the gland depth and the groove width is about 1.5 times larger than the ring's width.

Symbol Definitions

Parameters used in the discussion of O-Rings are defined in the following table:  O-Rings Parameters Symbol Parameter Units Description ID Inner Diameter inch (cm) Diameter of the inside edge of the cross-section. CSmax Maximum Cross-Section Diameter inch (cm) Upper bound on the cross-section diameter for a given set of input requirements. CSmin Minimum Cross-Section Diameter inch (cm) Lower bound on the cross-section diameter for a given set of input requirements. CStol Cross-Section Tolerance inch (cm) Manufacturing tolerance on the O-Rings cross-section diameter. Cmax Maximum Compression Factor N/A Upper bound for the cross-section compression when the O-Rings is seated in the gland; used as a design input. Cmin Minimum Compression Factor N/A Lower bound for the cross-section compression when the O-Rings is seated in the gland; used as a design input.

Radial Gland Symbol Definitions Parameters used in the discussion of glands for radial seals are defined in the following table: Gland Parameters for Radial Seals Symbol Parameter Units Description Bd Bore Diameter inch (cm) Inner diameter of the bore which confines the outer diameter of the O-Rings. Btol Bore Diameter Tolerance inch (cm) Manufacturing tolerance on the bore diameter. Gd Groove Diameter inch (cm) Minimum diameter of the gland which confines the inner diameter of the O-Rings. Gtol Groove Diameter Tolerance inch (cm) Manufacturing tolerance on the groove diameter. GW Groove Width inch (cm) Groove length in the axial direction; must be large enough to accommodate O-Rings axial expansion.

Design Guidelines Using the diametrical clearances given by the O-Rings' manufacturer usually provides the most effective and reliable sealing. They often provide information that can be used to estimate the gland depth required in O-Rings applications. This information is necessary for designing a system with a proper clearance gap so that the ring material will not extrude into the gap when subjected to pressure. The extruded ring material will quickly wear and fray, severely limiting the service life of the seal. Other factors, such as system pressure, ring compound and hardness, can affect the radial clearance used. There are number of ways to correct an extruding O-Rings application:

Reduce the clearance gap in the system by modifying the dimensions of the system.  Reduce the system operating pressure. Install backup rings in the groove with the O-Rings to prevent extrusion.  Use harder O-Rings compound.

These modifications, however, have their drawbacks. For example, reducing system-operating pressure may affect the operational parameter of the system and harder O-Rings may result in higher friction and a greater tendency of the seal to leak at low pressure.  In general, the ring's cross-section is about 20 percent great than the gland depth and the groove width is approximately 1.5 times the ring's cross sectional diameter if the its cross-section is larger than 1/16 in.  The surface finish of the groove has a great impact on the performance of the seal. There are two things to consider for determining the surface finish roughness:

1. Whether it is a static seal in which the O-Rings does not come into contact with any moving parts or a dynamic seal where relative motion exist between the O-Rings and other moving parts. and  2. In the case of static seal, whether the seal is for a liquid system or a gaseous system.

The table below sums up the intended application with the proper surface finishes: Application Surface finish roughness Static liquid system 0.81 - 1.60 mm Static gaseous system 0.41 - 0.81 mm Dynamic (sliding motion) 0.20 - 0.41 mm Dynamic (rotary motion) 0.41 - 0.81 mm It is desirable to circumferentially stretch the O-Rings slightly so that it sits securely in the groove during assembly. This can be done by selecting an O-Ring with an internal diameter 2% to 3% smaller than the groove diameter. For Further Details Email us : sales@fitcoseals.com www.oringstore.com www.fitcoseals.com

O-Rings Seals for Connector and Metal Tube Adapters Assemblies - FITCO

Tube Assemblies - Hydraulics Hose and Hose Fittings

For over a decade, we are manufacturing O-Rings for metal tube assemblies because of our precision engineering and quality control practices, companies have used our O-Rings for tube assemblies in hydraulic fluid transfer, fuel and oil, lubrication, fleet, automotive, and military applications.

O-Rings for Fuel Injection Tubes

O-Rings are used in Fuel Injection Tubes are used in large numbers in all kinds of diesel engines for automobiles, ships, construction equipment, and agricultural machinery

O-Rings for CRDi Tubes & Hydraulic Tubes

Common Rail technology operates at very high-pressure to achieve better air-fuel mixing and as a result, higher engine efficiency. We offer a qualitative range of High Pressure Hydraulic Tubes.

O-Rings for EGR & Bellows

EGR tube assembly carries unburnt gas vapors from the exhaust manifold chambers to the intake manifold and is reintroduced into the engine firing sequence

We expertise in O-Rings and   work in team to develop highly customized  O-Rings for tube assemblies for their OEM products.

FITCO works to ensure that every component and assembly we supply meets our highest expectations for quality and performance. Our experienced team leverages their thousands of hours of quality testing experience to closely inspect and approve each and every product that passes through our facility, ensuring that you receive products that enhance and empower your equipment.

As a quality-source supplier, Fitco Engineers Pvt Ltd consolidates and simplifies the engineering, specification, and purchasing processes for you. From the prototype stage to production, you can count on Fitco expertise for the essential o-rings for  fluid transfer systems of your machinery.

O-Rings Applications:

·         Hydraulic

·         Air Conditioning and Refrigeration

·         Truck and Bus

·         Pneumatic

·         Cooling

O-ring Installation Instructions & useful with O-ring seal connectors and adapters.

O-ring seal fittings are used for direct connection to existing pipe thread or straight thread ports which have a smooth, flat surface perpendicular to the threaded port. O-ring seal fittings provide leak-tight sealing on both vacuum and high pressure systems. The standard Buna N O-ring is completely contained in a precision groove, to prevent O-ring extrusion at high pressure. The precision groove also provides a controlled squeeze for a vacuum-tight seal.

Note:

When installing an O-ring port:

1. Hand-thread until the O-ring compresses on the port end.

2. Snug the fitting to the port with a wrench to completely compress the O-ring.

3. Always use a back-up wrench to hold the O-ring seal fitting body, when connecting or

disconnecting a end.

For Further Details Contact

Email: sales@fitcoseals.com

www.oringstore.com

www.fitcoseals.com