720 unitized piston – cost effective optimum performance
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DESIGN The Hallite 720 is a completely self-contained piston, bearing, and seal-in-one assembly that solves difficult assembly problems and can be a cost-effective alternative to the traditional piston assembly which has a separately fitted seal and bearing(s). The Hallite 720 improves stability and has smaller extrusion gaps that extend the life of the piston seal. Moulding the bearing material over the outer diameter gives an extremely tight fit between the piston and the cylinder bore.The piston diameter is tightly controlled which reduces the tolerance build up and results in increased performance. The Hallite 720 unitized piston is constructed using four components: • High strength steel body Non-metallic bearing Rubber energiser Filled PTFE seal ring for inch sizes Polyurethane seal ring for metric sizes The steel piston body is machined to exact dimensions. The non-metallic bearing material is moulded to the piston using a special proprietary process. It is then machined to the final precise outer diameter dimension to suit the cylinder bore and the seal is fitted. It is supplied ready to be attached to the piston rod for use in a cylinder. In many cases the Hallite 720 is also supplied with an internal static sealing O-ring to provide a positive seal between the piston and the rod. Those marked with an asterisk in the part number range on the following pages do not have this internal seal. The materials used in the standard unitised piston are selected to handle a broad range of application parameters. Contact your local Hallite technical team to decide which is best for your application. • Maximum bearing surface area for the piston length • Works on a variety of cylinder bore finishes • Increases side load capacity • Diminishes effect of fluid contamination • Compact piston design enables increase in stroke or reduction in overall cylinder length • Improves supply chain management by reducing warranty claims, increasing manufacturing capacity and reducing inventory • Eliminates metal-to-metal contact and ext

OPERATING CONDITIONS Maximum Speed Temperature Range Maximum Pressure TECHNICAL DETAILS Data given are maximum values and can apply depending on specific application. Maximum ratings of temperature, pressure, or operating speeds are dependent on fluid medium, surface, gap value, and other variables such as dynamic or static service. Maximum values are not intended for use together at the same time, e.g. max temperature and max pressure. Please contact your Hallite technical representative for application support. SURFACE ROUGHNESS Dynamic Sealing Face ØD₁ Static Sealing Face Ød₂ RADII Max...

PART NUMBER RANGE METRIC ØD₁ Part numbers suffixed by “*” are not fitted with an internal static sealing O-Ring. PART NUMBERS ON THIS PAGE ARE LISTED IN THE STANDARD MATERIAL OPTION. FOR MATERIAL VARIATIONS OR FOR CUSTOM SIZES, MATERIALS, OR SEAL DESIGNS, PLEASE CONTACT YOUR LOCAL HALLITE REPRE