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Hydraulic Seals - FAQs

​​​​​​​​​Can'​t find your answer below?  Feel free to Ask an Expert​​ or call us today.​


  1. I have a used seal​ and would​​​ like to order a Chesterton replacement; can I measure the used seal and use those dimension to place the order?
    We recommend that replacement seals are ordered using the actual equipment dimensions and NOT used seal measured or approximated dimensions.

  2. Which dimensions do I need to provide when ordering a seal?
    Chesterton has an EPS Engineering Request Form which provides sketches for each type of application. These sketches show clearly which dimensions are required to order that style of seal. This form also has a series of questions that can be used to communication important system information to the engineering group if you require support in making the final seal selection.


  1. What seal material do you recommend for standard hydraulic service?
    The Chesterton AWC800 (Red Polymer) material is suitable for use in most of today's standard hydraulic fluids found in industry.​

  2. What seal material would I use in a hydraulic system that utilizes a high concentration of glycol?
    The Chesterton AWC850 High Glycol Tolerant (HGT) material is specially formulated to operate in systems where the percentage of glycol exceed the percentage of water.

  3. What type of material does Chesterton recommend for wear bands in industrial and mining cylinders?
    Chesterton recommends our AWC660, 40% glass-filled nylon material as it holds up much better than the phenolic-based materials which tend to delaminate.


  1. If I need a split set of packing to do an infield rod seal replacement on my stamping press what product do you recommend?
    The Chesterton 8K and 27K V-Ring chevron packing sets are specifically designed for in-field packing replacement. The Chesterton 11K Stack-Pac is also specifically designed for installation where the packing must be split to wrap around the rod for installation into the stuffing box.

  2. What type of surface finish on my ram do you recommend when using your packing? 
    For the majority of our polymer seal materials, we recommend a dynamic surface finish of 8 to 24 Ra μin (0.20 to 0.61 Ra μm) and for the static surface we recommend  30 to 40 Ra μin (0.76 to 1.17 Ra μm)

  3. Why does Chesterton recommend using 9K Anti Extrusion Rings (AER) in certain applications? ​
    AERs are necessary to keep seals from extruding in between the gland ID and the rod, or the piston OD and the bore in high-pressure or high-shock load situations. They also help keep the heal area of a seal from taking a set into the metal groove, which can lead to eventual failure.

For additional questions, call us or Ask an Expert​.

Chesterton Polymer Seal Tooling