Hydraulic Seals And Pneumatic Seals

Our aim is Customer Satisfaction, Through Quality Products & Prompt Services
Maintenance Solutions

Engineered Polymer Solutions for Hydraulic, Pneumatic, and Rotating Equipments

Chesterton'" positive rake wipers are designed to effectively clean and dislodge foreign matter from retracting rods or rams to prevent scoring and system contamination. The sharp, rugged, flared profile provides protection against abrasive particles which can con - taminate the system and lead to premature equipment failure. These wipers provide excellent performance on rods or rams in hydraulic and pneumatic applications. The 21 K design is manufactured using a machining process which allows the flexibility to create any size based on equipment dimensions. This design incorporates a built-in static seal on the flange to ensure contaminants do not migrate along the stationary side of the wiper during operation. The SK Super Wiper is made from a compression molding process that utilizes existing tooling. Additional custom designs were developed to meet specific application and equipment needs which include snap-in, stepped, and bi-directional wipers.

  • Single-acting, abrasion - resistant design for hydraulic and pneumatic applications
  • Positive rake lip design effectively wipes contaminants away from surface
  • Manufacturing process allows flexibility to create any size
  • Sizes made to accommodate international standards including ISO and DIN

Rod Seals and Piston Seals

Chesterton" 1 OK Super Monoseal" and 22KN are single-acting, U-cup designs. The positive rake, lip profile provides an optimal amount of radial sealing load with minimal frictional resistance. This seal design is offered as a rod or piston seal and provides outstanding performance in both hydraulic and pneumatic applications. The 1 OK Super Monoseal" is made from a custom molding process that utilizes existing tooling. The 22KN design is manufactured using a machining process which allows the flexibility to create any size based on equipment dimensions. A number of unique designs have been derived from the originall OK to address specific needs and applications in the market. These include designs to address pressure reversal, pressure spikes, and system vacuuming.

  • Single-acting, U-cup design minimizes frictional resistance
  • Positive rake lip design wipes contaminants away from mating surface
  • Abrasion-resistant design, outstanding performance in hydraulic and pneumatic applications
  • Manufacturing process allows flexibility to create any size
  • Sizes made to accommodate international standards including 150 and DIN

Ancillary Devices

Chesterton" 9K anti-extrusion rings, often referred to as back-up rings, are designed to prevent seals or O-rings from extruding into equipment clearances while under pres- sure. Each ring is individually manufactured and provides excellent performance, as a supporting element, to both piston, rod and face seals that are generally found in static or dynamic applications.

Chesterton" 9K anti-extrusion rings, utilize a machining process to create a final product which enables all sizes to be made to equipment dimensions. These anti-extrusion rings are available in various extrusion-resistant materials and are located on the back-side or low pressure side of the sealing element they are supporting. Anti-extrusion rings are available in many materials and custom profiles including rectangular, contoured, con-tinuous or split designs.

  • Prevent extrusion of sealing element into equipment clearances, improve MTBR
  • Static and dynamic applications, plant-wide usage
  • Machining process, allows the flexibility to create any size
  • Available in various profiles and materials
  • Back up rings, prevent seal extrusion

Hydraulic and Pneumatic Sealing Devices


Hydraulic/Pneumatic Division is a world wide manufacturer and distributor of the highest performing sealing devices including seals, wipers/excluders, bearing bands, o-rings and kits for a wide range of applications. Our products and technical services are second to none. We have thousands and thousands of existing seal designs in a wide range of materials, sizes and profiles. Plus, we pride ourselves on our ability to provide custom engineered solutions to even your toughest sealing requirements… in many cases shipped to you overnight! Chesterton is headquartered in Stoneham, Massachusetts with manufacturing facilities around the state and through out the world. Products are stocked, sold and serviced by highly trained Chesterton Specialists in over 97 countries world wide. This extensive network provides you with the best applications assistance and service available through out the industry. A combination of our unique, high performance materials, the expertise of your local Chesterton Technical Specialist and the support of our engineering staff will enable you to enjoy significantly reduced operating costs, increased reliability and years of trouble free service. Whether you have a low to medium volume, fast turn around MRO or after market requirement, or a high volume OEM quirement, Chesterton’s Hydraulic/ Pneumatic Division is the one to call.