HSO is a double-acting piston sealing profile consisting of a polyurethane ring and an energising O-ring. It provides reliable static and dynamic sealing in medium-duty hydraulic cylinders.
To install the HSO, clean the housing, remove sharp edges and fit the O-ring first, followed by the profile without twisting. Lubricate with compatible system oil and check wear, gaps and damage during maintenance.
The HSO profile can be manufactured with a 95 Shore A or 98 Shore A AU polyurethane ring and a 70 Shore A NBR nitrile rubber O-ring. Other material combinations are available on request, depending on fluid, temperature and pressure.
| No. | ØD | Ød | B | r | n | O-ring |
|---|---|---|---|---|---|---|
| JP-16*8.5*3.2 HSO | 16 | 8.5 | 3.2 | 0.6 | 3 | 7.60*2.62 |
| JP-25*14*4.2 HSO | 25 | 14 | 4.2 | 1 | 4 | 13.87*3.53 |
| JP-30*22.5*3.2 HSO | 30 | 22.5 | 3.2 | 0.6 | 3 | 21.89*2.62 |
| JP-32*21*4.2 HSO | 32 | 21 | 4.2 | 1 | 4 | 20.22*3.53 |
| JP-32*24.5*3.2 HSO | 32 | 24.5 | 3.2 | 0.6 | 3 | 23.81*2.62 |
| JP-35*27.5*3.2 HSO | 35 | 27.5 | 3.2 | 0.6 | 3 | 26.64*2.62 |
| JP-38*30.5*3.2 HSO | 38 | 30.5 | 3.2 | 0.6 | 3 | 29.82*2.62 |
| JP-40*29*4.2 HSO | 40 | 29 | 4.2 | 1 | 4 | 28.17*3.53 |
| JP-50*39*4.2 HSO | 50 | 39 | 4.2 | 1 | 4 | 37.69*3.53 |
| JP-55*39.5*6.3 HSO | 55 | 39.5 | 6.3 | 1.3 | 5 | 37.47*5.33 |
| JP-60*49*4.2 HSO | 60 | 49 | 4.2 | 1 | 4 | 47.63*3.53 |
| JP-63*52*4.2 HSO | 63 | 52 | 4.2 | 1 | 4 | 50.80*3.53 |
| JP-65*54*4.2 HSO | 65 | 54 | 4.2 | 1 | 4 | 52.39*3.53 |
| JP-70*59*4.2 HSO | 70 | 59 | 4.2 | 1 | 4 | 57.15*3.53 |
| JP-80*64.5*6.3 HSO | 80 | 64.5 | 6.3 | 1.3 | 5 | 62.87*5.33 |
| JP-80*69*4.2 HSO | 80 | 69 | 4.2 | 1 | 4 | 68.26*3.53 |
| JP-90*74.5*6.3 HSO | 90 | 74.5 | 6.3 | 1.3 | 5 | 72.40*5.33 |
| JP-100*84.5*6.3 HSO | 100 | 84.5 | 6.3 | 1.3 | 5 | 81.92*5.33 |
| JP-110*94.5*6.3 HSO | 110 | 94.5 | 6.3 | 1.3 | 5 | 94.62*5.33 |
| JP-115*94*8.1 HSO | 115 | 94 | 8.1 | 1.3 | 7 | 92*7 |
| JP-120*104.5*6.3 HSO | 120 | 104.5 | 6.3 | 1.3 | 5 | 104.14*5.33 |
| JP-125*109.5*6.3 HSO | 125 | 109.5 | 6.3 | 1.3 | 5 | 107.32*5.33 |
| JP-130*114.5*6.3 HSO | 130 | 114.5 | 6.3 | 1.3 | 5 | 113.67*5.33 |
This technical diagram defines the dimensions and geometric variables required for the correct selection and installation of the HSO piston seal, a compact double-acting profile consisting of a polyurethane ring and an energizing O-ring, intended for medium-duty hydraulic cylinders. It sets out the critical dimensions linked to the size table, namely the housing outside diameter (ØD), the groove root diameter (Ød), the groove width (B), the groove root radius (r) and the length of the lead-in chamfer (n), drawn at 20°. The drawing also carries the edge radius r1 ≤ 0.2 and dimension S, neither of which appears in the size table. All housing edges must be rounded and free from burrs. Observing these dimensions ensures the assembly seats correctly in the piston housing, without twisting or damage to the ring, and operates reliably on diameters from 10 to 300 mm.
This 3D illustration shows the basic structure of the HSO piston seal. You can see the polyurethane sealing ring, the component that bears against the cylinder liner and performs the sealing, and the energizing O-ring fitted behind it, which keeps the ring pressed against the wall and compensates for wear and pressure variations. This two-piece construction is what delivers reliable static and dynamic sealing with a compact and simple housing. The ring is manufactured in 95 or 98 Shore A AU polyurethane and the O-ring in 70 Shore A NBR nitrile rubber, and the compound must be selected according to the operating temperature, fluid and pressure.
