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Back-Up Rings

FLEXIBLE CUSTOM DESIGNS

Whether you need a solid or scarf cut, rod, piston or another design to fit a certain gland specification, Greene, Tweed has the ability to handle any back-up ring request.

Because of our emphasis on custom engineering to meet customers’ requests, we can design almost any type of back-up ring configuration to meet your needs.

Additionally, back-up rings can be manufactured in virtually any material that Greene, Tweed sells. This ensures the best compromise between price and performance for your specific application.

4330/4340 SERIES

Greene, Tweed’s new 43 back-up ring series has been specifically designed for use in AS5857 gland configurations as anti-extrusion devices in conjunction with O-rings, packings or other elastomeric seal types. A variety of high-performance materials can be provided and specifically targeted to meet the customer’s application requirements.

This series provides a part numbering system for back-up rings per the Aerospace Industry specifications AS5860 and AS5861, which are appropriate for use in static glands according to AS5857. The materials shall consist of filled PTFE (polytetraflouroethylene). The AS5860 specification is for scarf-cut (split) back-up rings while AS5861 is the specification for solid-type rings.

4230/4240 SERIES

This series provides a part numbering system for back-up rings as per the Aerospace specifications AS5781 and AS5782. These specifications are based on virgin but pigmented PTFE materials. AS5781 is the specification for scarf-cut (split) back-up rings while AS5782 is the specification for solid-type rings. Either is appropriate for use in AS4716 glands.

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4270 SERIES

Greene, Tweed’s 4270 series has been specifically designed for use in MIL-G-5514 gland configurations as anti-extrusion devices in conjunction with O-rings, packings or other elastomeric seal types. A variety of high-performance materials can be provided and specifically targeted to meet the customer’s application requirements.

4330/4340 SERIES PART NUMBERING SYSTEM

The part numbering system requires the use of the material designator table found below. For nonstandard designs contact GT engineering.

anti-extrusion-back-up-rings-partnumber1

anti-extrusion-back-up-rings-table2

4270 SERIES PART NUMBERING SYSTEM

The part numbering system requires the use of the material designator table found below. For nonstandard designs contact GT engineering.

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anti-extrusion-back-up-rings-table3

Contact your local Greene, Tweed representative for specific recommendations to suit higher performance requirements.

4230/4240 SERIES PART NUMBERING SYSTEM

The part numbering system requires the use of the material designator table found below. For nonstandard designs contact GT engineering.

anti-extrusion-back-up-rings-partnumber2

anti-extrusion-back-up-rings-table1



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