Prädifa Technology Division

Novel Roll2Seal® from Parker Prädifa Seals Bores Easily and Effectively

Parker Prädifa unveils all-new development of a static, self-retaining sealing solution with equally new assembly process.


Bietigheim-Bissingen / Hannover, 1. April 2019 - The Engineered Materials Group of Parker Hannifin Corporation, the global leader in motion and control technologies, presents Roll2Seal®, an all-new sealing solution for easy and safe sealing of bores in non-pressurized applications. The clever patent-pending design enables an easy and accurate assembly process in which the seal rolls into its seat undamaged and without a lead-in chamfer.


Whenever components have been provided with bores for subsequent installation of additional assemblies and such bores require reliable permanent or temporary sealing – for instance during shipping or for test runs – design engineers are frequently faced with a problem: The bore is to be closed with a cover but the surrounding space is too small for a classic flange seal. If a lead-in chamfer of 15 to 20° is lacking radial sealing is doomed to fail because the seal would not survive installation undamaged even with a chamfered or rounded edge of the bore: part of the seal would inevitably be sheared off.


Rolling instead of Slipping
According to the “rolling instead of slipping” principle, Parker Prädifa has now solved this problem in a clever way: The novel static Roll2Seal® featuring an innovative geometry requires no lead-in chamfer, no deburring, is self-retaining, and delivers both temporary and permanent protection against dirt and wetness.


Roll. Fix. Seal. Once or Repeatedly as Needed
Both one-time and multiple installation and de-installation are very easy and, due to the seal’s immunity against unbroken edges of the bore, can be accomplished without damaging the seal: Instead of destructively squeezing the seal at the edge it is simply made to roll across the critical area, which keeps the seal intact. This is possible due to the seal’s innovative triangular geometry in interaction with the special contour of the seal’s seat on the cover which, due to the reversal of the press-in force curve, is pulled into the hole toward the end of the assembly process until it audibly clicks in. The geometry can be adapted to the respective hole diameters using Finite Elements Simulation. 


The space- and cost-saving Roll2Seal® is produced from suitable materials according to the thermal and mechanical requirements. The sealing system consists of a metal or plastic cover and the seal. It is available in pre-assembled condition if desired.


About Parker Hannifin
Parker Hannifin is a Fortune 250 global leader in motion and control technologies. For 100 years the company has engineered the success of its customers in a wide range of diversified industrial and aerospace markets. Learn more at or @parkerhannifin.


Parker Hannifin’s Engineered Materials Group is a world leader in the production of sealing systems and engineered polymer components as well as EMI shielding and thermally conductive materials.


Christine Stehmans, Marketing Communications Manager
Parker Hannifin GmbH · Engineered Materials Group Europe
Arnold-Jäger-Str. 1 · 74321 Bietigheim-Bissingen, Germany
Tel. +49 (0) 7142 351-440 · Fax +49 (0) 7142 351-432