PDW-Piston Profile, Machined PTFE Wear Rings are available from Parker in a variety of PTFE blends and provide excellent low-friction and high temperature performance in pneumatics and light-duty hydraulics. PTFE compounds 0401, 0307, and others have outstanding chemical compatibility with a wide range of fluids. Polyacetal, nylons, molybdenum disulfide, and many different PTFE filler combinations are also available for specialized applications. Composite, fabric-reinforced resins are also available to accommodate sideloads far more severe than glass-loaded nylon compounds can withstand. Composite resins also resist moisture swell in water-glycol emulsions and other water-based fluids.

Part numbers are shown for standard sizes and hardware dimensions and may be produced in virtually any width from 0.125 to 2.000, and larger, based upon bore diameter.

The final four “XXXX” characters in the part number reflect wear ring width based upon desired size.

For example: ½” wide = 0.500 and for part numbering purposes, final four XXXX characters would be substituted with 0500. (To produce final four characters of part number, use this method: 0.500 x 1000 = 0500.)“Please see literature in Product Support tab for assistance.”

If you need technical assistance with determining recommended wear ring widths, or alternate cross-sections for your specific application, please contact Parker EPS Division's application engineering team at 801-972-3000.

Standard Materials:
• 0401 Bronze (40%) filled PTFE; Temp -200F / +575F
• 0307 Carbon (23%) & Graphite (2%) filled PTFE; Temp -250F / +575F
• 0810 Composite, Standard Polyester-based with PTFE; Temp -40F / +200F
• 0811 Composite, Graphite-filled Polyester Based; Temp -40F / +200F
• 0812 Composite, MoS2-filled Polyester Based; Temp -40F / +400F
• 0813 Composite, PTFE-Filled Polyester Based; Temp -40F / +400F

Alternate Materials: For applications that may require an alternate material, please contact your Parker EPS representative.

Radial Tolerance
• +.000"/ -.004"

End Cut Configuration Types:
• Angle Cut
• Butt Cut
• Step Cut
Angle cut part numbers shown. Butt cut and step cut also available. See literature documents in Product Support tab for part numbering.

Typical Applications:
• 0401 – 40% Bronze-filled PTFE is primarily used in light-duty hydraulic applications. This self-lubricated, long-wearing material offers superior frictional characteristics and high temperature capabilities. It is not recommended for use with aluminum bores and soft metal rods, nor in applications involving moderate to heavy side loading.
• 0307 – 23% Carbon, 2% Graphite-filled PTFE is the most popular material for pneumatic applications. This self-lubricated compound ensures long life, low friction and high temperature capabilities. The carbon-graphite fillers allow for outstanding performance, lessen the risk of scratching or scoring soft metal surfaces.
• 0810 – Composite fabric reinforced, Standard polyester-based with PTFE. This polyester-based fabric-reinforced resin is used to handle severe sideloads and swell from moisture. Internally lubricated for dry running service
• 0811 - Composite fabric reinforced, Graphite-filled polyester based. This polyester-based fabric-reinforced resin is filled with graphite to handle severe sideloads and swell from moisture. Low friction, non-lubricated service
• 0812 - Composite fabric reinforced, MoS2-filled Polyester based. This high temperature polyester-based fabric-reinforced resin is filled with MoS2. Low friction, non-lubricated service.
• 0812 - Composite fabric reinforced, PTFE-filled polyester based. This high temperature vinyl-ester based fabric-reinforced resin is filled with PTFE. Internally lubricated for dry running.

Machined PTFE Wear Rings for Pistons (PDW)