Friday, 31 August 2018

Fitco O-Ring Kit - NBR 5A - Inches sizes o rings

O Ring Kits contains the most often used Imperial sizes of AS-568 standard size O-Rings

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

Friday, 3 August 2018

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. 

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 :

Saturday, 21 July 2018

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.
Ring Cross-Section

Symbol Definitions
Parameters used in the discussion of O-Rings are defined in the following table: 
O-Rings Parameters
Inner Diameter
inch (cm)
Diameter of the inside edge of the cross-section.
Maximum Cross-Section Diameter
inch (cm)
Upper bound on the cross-section diameter for a given set of input requirements.
Minimum Cross-Section Diameter
inch (cm)
Lower bound on the cross-section diameter for a given set of input requirements.
Cross-Section Tolerance
inch (cm)
Manufacturing tolerance on the O-Rings cross-section diameter.
Maximum Compression Factor
Upper bound for the cross-section compression when the O-Rings is seated in the gland; used as a design input.
Minimum Compression Factor
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
Bore Diameter
inch (cm)
Inner diameter of the bore which confines the outer diameter of the O-Rings.
Bore Diameter Tolerance
inch (cm)
Manufacturing tolerance on the bore diameter.
Groove Diameter
inch (cm)
Minimum diameter of the gland which confines the inner diameter of the O-Rings.
Groove Diameter Tolerance
inch (cm)
Manufacturing tolerance on the groove diameter.
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:
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
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Wednesday, 4 July 2018

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.

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

Friday, 17 November 2017

Understanding Automotive O-Rings and Seals

Automotive O-Rings and Seal which is used for filling the gap between the two components in order to ensure that there is no leakage between them during compression stage. Automotive seals can bear both low and high compressive loads. These automotive parts come in different designs, shapes and specifications. Commonly used seal include o-rings, O-rings can be used in static applications and in dynamic applications, in the automotive industry o-rings is to seal at -40°C without leakage.
The stationery sprung elements that are used for holding tightly the various components of an automobile are automotive o-rings, The materials and design is such that the O-rings manufactured for the automotive industry can function effectively in extreme temperatures, under pressure, and in the presence of harsh liquids and gases
Seals are an imperative part of the automotive industry. They are used in various applications and components. Seals enable a vehicle and its engine to function smoothly. These components are used across automotive applications like motorcycles, all terrain vehicles and other off-road heavy-duty equipment.
Although seals form a small part of the constitution of a vehicle or engine, they serve a bigger purpose. Some of these functions are : Enclosing liquid and gases in a chamber, Keeping dust and other contaminants away from the integral parts of the component. They also keep different types of liquids and gases away from one another, Protection of bearings.
Generally, automotive seals are corrosion-resistant and have long service lives. Depending on the type of engine used and its emission standards, the material of the seals can vary.
Customer demand and government regulations continue to push the automotive industry to improve efficiency, and many of these improvements affect o-ring and seal materials .
For additional information on the best material to solve your sealing challenges, please contact us :

Sunday, 12 November 2017


O-Rings developed and manufactured by FITCO are safe sealing solutions for automotive and truck applications. O-Rings can be used in static or dynamic assemblies. Our expertise covers all demanding automotive and truck applications like fuel, air intake, filtration, braking, cooling, HVAC, SCR, transmission, etc. 

According to your requirements, our engineering teams will develop optimal solutions with custom dimensions or compounds, including high cleanliness range or specific surface treatments reducing friction forces or facilitating the use in automatic feeding distribution systems


Our O-Rings ensure perfect static and dynamic seals between two parts assembled radially (shafts) or axially (covers). Our O-Rings can withstand the most extreme temperatures and fit in the smallest spaces.