Seal Profiles Guide

This Seal Profiles Guide is designed for anyone involved in machine and equipment maintenance and refurbishment, particularly working with hydraulic and pneumatic applications.

What are machined seals?

Machined seals are turned on our CNC lathes using software specifically designed to create the appropriate profile.  Provided we have the metalwork dimensions and the profile detail, the software will apply weightings to facilitate a working seal for the application for which that profile of seal was designed. If the seal required is not one of the ‘standard’ profiles available, we can manually code the design that you do require, or we can work with you to develop a seal that fits your application.

A101 Wiper Scraper Seal in its correct application

A101 Wiper Scraper Seal in its correct application

What choices are available to you?

We manufacture a variety of standard seal profiles; these are designed for hydraulic and pneumatic applications, and are profiles used throughout industry in most standard applications.  This guide shows 125 such designs for you to choose from – we just need to know which profile you require, what material we should use (or some detail on the application in order to advise you).  We will also require metalwork dimensions including the ID (inner diameter), OD (outer diameter), height of the metalwork groove, along with any stepped dimensions within the profile.  Please see the questions below for further information on how to use the profiles guide and which dimensions we need. In addition to our standard range, we can manufacture ‘special’ profiles; these are any seals required outside of this range of standards offered.  This may be as a result of a particularly archaic or innovative design.  In such cases, please supply either a sketch and metalwork sizes as preference; we can manufacture from a sample but you should be aware that any wear or distortion on a used seal will have to be judged and therefore cannot be guaranteed to fit. We hold a range of materials in stock and therefore can offer a solution in a lead-time to suit the requirements of most machine break-downs or maintenance; a fast-track service may be available for urgent jobs.  Our machined seals are turned and therefore must be of a material of 85-90 shore hardness. If you are seeking a seal from a softer material, a continuous length or a very bespoke profile or shape, we will be able to offer either an extruded or a moulded option as an alternative, so whatever your sealing requirements, please get in touch.

How do I use your profiles guide?

Each of the reference numbers show a seals’ profile; the orientation of the seal is always as follows, with the ID being the bottom of the drawn profile and the OD the top, as demonstrated by the following diagram using the A101 profile as an example:

A101 Seal Dimensions required for manufacture

A101 Seal Dimensions required for manufacture

Select the profile you require, give us the code reference and the relevant dimensions, along with the material or some detail on the application, and we will manufacture to your specification.

What is the difference between the metal dimensions and the seal dimensions?

Depending on the job that the seal is required to do, the seal will fit a groove differently; a wiper, an energised u-seal or a glide ring would be designed with differing emphases in order to assist their effectiveness.  If we are given metalwork sizes to work to, our software will calculate the dimensions of the seal that you require in conjunction with the profile that is selected. Seal dimensions taken from a sample are far less likely to provide the result you require, unless the profile is identical to that which we machine, and the sample is not worn or distorted in any way; small nuances within a profile can affect the way in which a seal performs. In summary, metalwork dimensions are always preferable if you have them available, as below using the A101 profile as an example:

A101 Housing Dimensions required for manufacture

A101 Housing Dimensions required for manufacture

Can you produce a seal to a sample that I provide?

Yes, if you send us the sample we will measure and copy the one provided.  However, if the seal has been used there is every chance that it will be worn or distorted; we cannot be held responsible for fit and function.

Can you supply a kit of parts?

Yes – we can keep a record of any parts (including moulded items, o-rings, free-issued parts and seals), and manufacture to order the relevant parts, kit into a pack and supply labelled.  We have several customers for whom we currently perform this service, and for many years we sold a range of seal kits into the construction equipment trade, so it is an area in which we have a great deal of experience.

MR Seal Kits for repair of Rams and Cylinders

MR Seal Kit, containing all the parts required to refurbish the sealing elements of a cylinder

What are the benefits of using machined seals?

There are a number of benefits; firstly, due to the manufacturing method, dedicated tooling is not needed to manufacture a part – there may be a small set-up required but the absence of a physical tool can reduce the overall cost, particularly for low quantities of parts. The materials available for machining include a range of rubbers and plastics, as well as composites and polymers; this allows for a material to be selected in accordance with your specific application.  Engineering plastics are constantly developing as innovative materials become available on the market and traditional ones are refined; many of the older material options have been replaced with modern solutions offering an equivalent or improved performance; for example, the old style “rag and rubber” seals are now manufactured using cast polyurethane, turned to produce a one-piece seal. Since there is no need for dedicated tooling and the readily available materials, this method of manufacture can be ideal for development work, producing a small quantity of prototypes and adjusting variables to reach the most effective solution. Once set up, the software will produce the same seal repeatedly and to the same dimensions, allowing for a consistent, repeatable product.

Conclusion:

Turning plastics and rubbers can be fast, cost-effective and straightforward; call us with the required dimensions and profile details and we will work with you to produce the seal that will suit your application – no more waiting for OEM parts for weeks! Call 023 8022 6330 or email the details of your requirements to sales@martins-rubber.co.uk Write to us at: Martin’s Rubber Company Limited Orchard Place Southampton SO14 3PE

See our Seal Profile Guide in PDF

Please note that this is only a selection of the standard profiles available as a general guide, and we recommend you contact us for specific advice on the optimum seal design and material selection. Open our Seal Profile Guide in PDF