Flange Gaskets
Key Features
- Precision CNC cut for accurate dimensions and consistent quality
- Available in full-face, bolt-hole and ring gasket configurations
- Manufactured from rubber and specialist sealing sheet materials
- Standard DIN/EN, BS10 and ANSI/ASME flange sizes available
- Suitable for a wide range of industrial sealing applications
- Custom internal diameters, external diameters and thicknesses
- Standard and bespoke gaskets available with fast manufacturing options
Product Description
Our flange gaskets provide a reliable sealing solution for pipework, valves, pumps and industrial flange connections. Designed to create a secure seal between adjoining flange faces, these precision-cut gaskets help prevent the leakage of liquids and gases across a wide range of industrial applications.
We manufacture standard and bespoke flange gaskets using our in-house CNC gasket cutting technology. Gaskets can be produced from a comprehensive selection of rubber and specialist sealing sheet materials, including EPDM, neoprene, nitrile, silicone, graphite, PTFE and non-asbestos gasket materials, depending on application requirements.
Our range includes full-face flange gaskets, bolt-hole gaskets and inside-bolt-circle ring gaskets, available in standard dimensions or manufactured to customer specifications. We can supply gaskets to suit DIN/EN, BS10 and ANSI/ASME flange dimensions, with a comprehensive selection of gasket tables available to help identify the correct size.
Whether you require a standard replacement gasket, a large-diameter sealing ring or a bespoke flange gasket manufactured from a technical drawing, our team can assist with material selection, dimensional requirements and manufacturing options.
Types of Flange Gaskets
Different flange connections require specific gasket designs to achieve effective sealing. The correct configuration depends on the flange face, bolt arrangement, operating pressure and sealing material.
Full-Face Flange Gaskets
Full-face flange gaskets extend across the entire flange face and feature accurately positioned bolt holes. They provide a continuous sealing surface around the pipe opening and bolt positions, making them suitable for full-face flange connections.
Inner Bolt Circle (IBC) Ring Gaskets
Inner Bolt Circle (IBC) gaskets, also known as ring gaskets, fit within the flange bolt circle without extending to the fixing holes. Their compact design provides a sealing surface around the pipe bore and is commonly used with raised-face flange connections.
Flange Gasket Materials
Selecting the correct gasket material is essential for achieving reliable sealing performance. Material choice should consider the operating pressure, temperature, media being sealed and flange design.
Other materials, including butyl rubber, sponge rubber and specialist gasket compounds, may also be available. Suitability must be assessed for the specific operating conditions.
Standard Flange Gasket Sizes & Tables
We manufacture flange gaskets to a wide range of standard flange dimensions. Use the tables below to identify suitable gasket sizes for your flange connection.
DIN / EN Flange Gaskets
Standard dimensions for PN6, PN10, PN16, PN25 and PN40.
BS10 Flange Gaskets
Gasket dimensions for BS10 Tables A, D, E, F, H, J and K.
ANSI / ASME Flange Gaskets
Dimension tables for ASME B16.21 Class 150, 300 and 600, and ASME B16.47 Series A and B for larger flange sizes.
View our flange gasket dimension tables to identify suitable standard sizes.
The selected gasket dimensions must match the applicable flange standard, facing and pressure class.
How to Measure a Flange Gasket
Accurate measurements are essential when identifying a replacement flange gasket or specifying a bespoke component.
The main dimensions include:
• Internal Diameter (ID): The diameter of the central opening.
• Outside Diameter (OD): The overall external diameter.
• Thickness: The thickness of the gasket material.
• Bolt Hole Diameter: The size of each fixing hole, where applicable.
• Pitch Circle Diameter (PCD): The diameter of the circle passing through the centres of the bolt holes.
• Number of Bolt Holes: The total quantity and arrangement of fixing holes.
For standard flanges, we recommend confirming the relevant flange standard and pressure designation rather than relying on measurements alone.
Click here for further guidance on How to Measure a Gasket.
Bespoke Flange Gasket Manufacturing
Our in-house CNC gasket cutting capabilities enable us to manufacture standard and non-standard flange gaskets from a wide selection of sheet materials.
We can produce gaskets to customer drawings, dimensional specifications or existing samples, including large-diameter rings and specialist bolt-hole configurations.
Our manufacturing capabilities include precision CNC cutting, bespoke gasket shapes, custom thicknesses and material selection to suit individual applications.
We can also assist with replacement gaskets for existing equipment where standard dimensions or original components are unavailable.
FAQs
A full-face flange gasket extends across the flange face and includes holes for the fixing bolts. An inside-bolt-circle ring gasket fits within the bolt circle and does not contain bolt holes. The correct design depends on the flange facing, dimensions and operating requirements.
Flange gaskets can be manufactured from EPDM, neoprene, nitrile, silicone, natural rubber, PTFE, graphite and specialist non-asbestos gasket materials. The most suitable material depends on the operating temperature, pressure and media being sealed.
Yes. We can manufacture bespoke flange gaskets using CNC cutting technology. Customers can provide technical drawings, existing samples or dimensions specifying the internal diameter, external diameter, thickness and bolt-hole arrangement.
The correct gasket size is normally determined by the flange standard, nominal bore, pressure class and flange facing. Where these details are unavailable, accurate measurements of the existing gasket and flange may help identify a suitable replacement.
Large-diameter flange gaskets can be manufactured from suitable sheet materials, subject to material dimensions and cutting capabilities. Our team can review your specifications to determine an appropriate manufacturing method.
Suitability depends on the rubber compound, gasket design, flange configuration, operating temperature and pressure. Not all rubber materials are appropriate for high-pressure or high-temperature systems. Specialist gasket materials may be required.
Potential Applications
- Sealing industrial pipework and flange connections
- Pumps, valves and fluid handling equipment
- Water treatment and distribution systems
- Oil, gas and petrochemical installations
- HVAC and mechanical plant equipment
- Marine pipework and engineering systems
- Food and beverage processing equipment
- Industrial machinery and manufacturing plant
