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Technical specifications
Catalogue rod seal

Rod seal HRO1

Description
The HRO1 is a double-acting hydraulic rod seal made up of two parts: a PTFE slipper ring with a trapezoidal profile acting as the sealing element, and an elastomer O-ring that pre-loads it against the rod. The trapezoidal cross-section keeps the robust, compact form of a piston seal without losing the flexibility needed to achieve pressure-related maximum compression. The edge angle allows a slight tilting of the seal, shifting maximum compression toward the pressure side and reducing the risk of gap extrusion.
Assembly
Fit the HRO1 into a closed groove according to the drawing dimensions, compatible with an ISO 7425-2 housing. Chamfer and round off the groove edges and carefully clean the housing before assembly. Do not drag the seal over sharp edges or threads, and lubricate the rod and the seal with the working fluid itself before insertion.
Advantages
  • Very good static sealing performance.
  • Allows increased working clearance (approximately +50% depending on conditions).
  • Low friction and stick-slip-free operation.
  • Low breakout force and high wear resistance.
  • High extrusion safety.
  • Simple groove design, compatible with ISO 7425-2 housing.
  • Suitable for environmentally friendly hydraulic fluids and available up to 2600 mm diameter.
Materials
The slipper ring is made of high-performance PTFE (filled according to the application) and the pre-loading O-ring can be supplied in NBR or FKM depending on the fluid and working temperature. The PTFE+NBR combination, with a 70 Shore A O-ring, suits mineral hydraulic oils HL and HLP, greases and water-glycol fluids within their ranges. The PTFE+FKM combination, with an 80 Shore A O-ring, offers higher thermal and chemical resistance, suitable for higher temperatures and for HFD fluids. Other material combinations available on request.
Technical data
  • -45ºC/200ºC
  • 60 MPa
  • < 15 m/s
  • 3 - 2600 mm
NO.dDB
U-3*7.9*2.2 HRO137.92.2
U-4*8.9*2.2 HRO148.92.2
U-5*9.9*2.2 HRO159.92.2
U-6*10.9*2.2 HRO1610.92.2
U-7*11.9*2.2 HRO1711.92.2
U-8*12.9*2.2 HRO1812.92.2
U-8*15.3*3.2 HRO1815.33.2
U-10*14.9*2.2 HRO11014.92.2
U-10*17.3*3.2 HRO11017.33.2
U-12*16.9*2.2 HRO11216.92.2
U-12*19.3*3.2 HRO11219.33.2
U-14*18.9*2.2 HRO11418.92.2
U-14*21.3*3.2 HRO11421.33.2
U-15*19.9*2.2 HRO11519.92.2
U-15*22.3*3.2 HRO11522.33.2
U-16*20.9*2.2 HRO11620.92.2
U-16*23.3*3.2 HRO11623.33.2
U-18*22.9*2.2 HRO11822.92.2
U-18*25.3*3.2 HRO11825.33.2
U-19*29.7*4.2 HRO11929.74.2
U-20*27.3*3.2 HRO12027.33.2
U-20*30.7*4.2 HRO12030.74.2
U-22*29.3*3.2 HRO12229.33.2
U-22*32.7*4.2 HRO12232.74.2
U-24*31.3*3.2 HRO12431.33.2
U-25*32.3*3.2 HRO12532.33.2
U-25*35.7*4.2 HRO12535.74.2
U-25.4*32.7*3.2 HRO125.432.73.2
U-25.4*36.1*4.2 HRO125.436.14.2
U-26*33.3*3.2 HRO12633.33.2
U-26*36.7*4.2 HRO12636.74.2
U-27*34.3*3.2 HRO12734.33.2
U-28*35.3*3.2 HRO12835.33.2
U-28*38.7*4.2 HRO12838.74.2
U-28.575*35.875*3.2 HRO128.57535.8753.2
U-29*36.3*3.2 HRO12936.33.2
U-30*37.3*3.2 HRO13037.33.2
U-30*40.7*4.2 HRO13040.74.2
U-32*39.3*3.2 HRO13239.33.2
U-32*42.7*4.2 HRO13242.74.2
U-35*42.3*3.2 HRO13542.33.2
U-35*45.7*4.2 HRO13545.74.2
U-36*43.3*3.2 HRO13643.33.2
U-36*46.7*4.2 HRO13646.74.2
U-38*48.7*4.2 HRO13848.74.2
U-38*53.1*6.3 HRO13853.16.3
U-39*49.7*4.2 HRO13949.74.2
U-40*50.7*4.2 HRO14050.74.2
U-40*55.1*6.3 HRO14055.16.3
U-42*52.7*4.2 HRO14252.74.2
U-42*57.1*6.3 HRO14257.16.3
U-44*54.7*4.2 HRO14454.74.2
U-44.4*59.5*6.3 HRO144.459.56.3
U-45*55.7*4.2 HRO14555.74.2
U-45*60.1*6.3 HRO14560.16.3
U-48*58.7*4.2 HRO14858.74.2
U-48*63.1*6.3 HRO14863.16.3
U-50*60.7*4.2 HRO15060.74.2
U-50*65.1*6.3 HRO15065.16.3
U-50.8*61.5*4.2 HRO150.861.54.2
U-50.8*65.9*6.3 HRO150.865.96.3
U-52*62.7*4.2 HRO15262.74.2
U-52*67.1*6.3 HRO15267.16.3
U-54*69.1*6.3 HRO15469.16.3
U-55*65.7*4.2 HRO15565.74.2
U-55*70.1*6.3 HRO15570.16.3
U-56*66.7*4.2 HRO15666.74.2
U-56*71.1*6.3 HRO15671.16.3
U-58*73.1*6.3 HRO15873.16.3
U-60*70.7*4.2 HRO16070.74.2
U-60*75.1*6.3 HRO16075.16.3
U-63*73.7*4.2 HRO16373.74.2
U-63*78.1*6.3 HRO16378.16.3
U-65*80.1*6.3 HRO16580.16.3
U-67*77.7*4.2 HRO16777.74.2
U-70*80.7*4.2 HRO17080.74.2
U-70*85.1*6.3 HRO17085.16.3
U-72*82.7*4.2 HRO17282.74.2
U-75*85.7*4.2 HRO17585.74.2
U-75*90.1*6.3 HRO17590.16.3
Technical drawing and installation parameters of the HRO1 rod seals
This technical drawing defines the essential dimensions and geometric variables for the correct housing and installation of the HRO1 rod seal in a closed groove compatible with ISO 7425-2. It specifies the critical dimensions linked to the data tables, including the groove width (B), the radial section height (S), the rod diameter (dN) and the housing bore diameter (D1), together with the groove edge radius (r1). These values house the trapezoidal slipper ring with its pre-loading O-Ring, allow work with a larger clearance without the risk of extrusion and prevent damage or twisting of the profile during assembly.
Three-dimensional view and components of the HRO1 rod seals
This 3D illustration details the basic structure of the HRO1 double-acting rod seal for hydraulic applications. The drawing clearly shows its two elements: the high-performance PTFE slipper ring with a trapezoidal section and the elastomer O-Ring in NBR or FKM, which preloads it against the rod. The trapezoidal section keeps the robust, compact shape of a piston seal without losing the flexibility needed to reach the maximum pressure-related compression, and the edge angle allows a slight tilt that shifts that compression towards the pressure side and reduces the risk of extrusion into the gap.
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