DanaStep R21
DanaStep is designed with the well-known profile that enables the seal to draw liquid back into the system. With two Dana Steps in tandem combined with a double wiper, there is zero leakage in almost any application. The radius of the rear of the seal secures optimal form stability.
A combination with DanaFlon compounds with maximum form stability provides the best possible safety. The DanaFlon materials are chemically resistant to all hydraulic media and the O-ring material can be chosen so that the seal is unaffected by the media.
Excellent electrical properties
Advantages:
- High dynamic and static sealing effect
- High extrusion resistance
- Low friction
- No stick-slip
- Small groove
- High operational stability
- Suitable for a wide variety of media
Applications
- Mobile hydraulics
- Standard cylinders
- Machine tools
- Injection moulding machines
- Presses
- Servo cylinders
Working conditions:
- Pressure: 80 Mpa
- Temperature: NBR O-ring: -30 to +100 FPM O-ring: -10 to +200
- Movement: High pressure, Intensive movement
- Speed: 15 m/s
- Standard: ISO 7425-2
- Diameter range: 3 to 1200 mm
- Action: Single-acting
| Intensive movement - High pressure | –200 to +260 °C | –200 to +260 °C | –200 to +260 °C |
| Basis material | PTFE | PTFE TFM | PTFE |
| DanaFlon | 24 | 45 | 32 |
| Filler | Bronze & Additives | Carbon fibre | Carbon & Graphite |
| Colour | Brownish | Dark Gray | Dark Black |
| Extreme form stability and extrusion resistance | yes | yes | (yes) |
| Lubricating media | yes | yes | yes |
| Extreme wear resistance | (yes) | (yes) | (yes) |
| Wide range of media | no | yes | yes |
| Non-lubricating media | no | yes | yes |
| Food applications | no | no | no |
| Conforms to food regulation | no | no | no |
| Intensive movement - High pressure | –200 to +260 °C | –200 to +260 °C | –200 to +260 °C | –60 to +60 °C Short duration: 120 °C |
–60 to +60 °C Short duration: 135 °C |
| Basis material | PTFE | PTFE | PTFE | UHMWPE | UHMWPE |
| DanaFlon | 41 | 16 | 55 | 91 | 98 |
| Filler | Carbon fibre | Mineral & MoS2 | Glass & MoS2 | Virgin | Virgin |
| Colour | Dark gray | Blue / Gray | Light Gray | White | White |
| Extreme form stability and extrusion resistance | (yes) | (yes) | (yes) | (yes) | (yes) |
| Lubricating media | yes | yes | yes | yes | yes |
| Extreme wear resistance | (yes) | (yes) | (yes) | yes | yes |
| Wide range of media | yes | yes | yes | yes | yes |
| Non-lubricating media | yes | yes | yes | yes | yes |
| Food applications | no | no | no | yes | yes |
| Conforms to food regulation | no | no | no | FDA, EU 10/2011 | FDA, 3A Dairy, EU 10/2011 |
DanaStep R21
Technical details
Here you can see the technical details
-
Ra max (0.2 μm)
-
Rz max (1.25 μm)
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Rp max (0.63 μm)
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Tp = 50 - 70% at depth of p= 0.25 Rz
| Series | øb f8/h9 | øA H11 | G + 0,2 | R | Max radial Clearance | O-Ring | |||||||
| Heavy | Standard | Light | 16 MPa | 26 MPa | 32 MPa | 40 MPa | Series | Cross sect. | |||||
| R21 | 00 | - | 3 - 7,9 | 8 - 18,9 | øB + 4,9 | 2,2 | 0,3 - 0,5 | 0,35 | 0,3 | - | - | 000 | 1,78 |
| 01 | - | 8 - 18,9 | 19 - 37,9 | øB + 7,3 | 3,2 | 0,5 - 0,8 | 0,4 | 0,35 | - | - | 100 | 2,62 | |
| 02 | 8 - 18,9 | 19 - 37,9 | 38 - 199,9 | øB + 10,7 | 4,2 | 0,8 - 1,2 | 0,5 | 0,4 | 0,3 | - | 200 | 3,53 | |
| 03 | 19 - 37,9 | 38 - 199,9 | 200 - 255,9 | øB + 15,1 | 6,3 | 1,2 - 1,5 | 0,55 | 0,45 | 0,35 | 0,3 | 300 | 5,33 | |
| 04 | 38 - 199,9 | 200 - 255,9 | 256 - 649,9 | øB +20,5 | 8,1 | 1,5 - 2,0 | 0,6 | 0,5 | 0,4 | 0,4 | 400 | 7,00 | |
| 05 | 200 - 255,9 | 256 - 649,9 | 650 - 999,9 | øB +24,0 | 8,1 | 1,5 - 2,0 | 0,7 | 0,6 | 0,55 | 0,5 | 400 | 7,00 | |
| 06 | 256 - 649,9 | 650 - 999,9 | - | øB +27,3 | 9,5 | 2,0 - 3,0 | 0,75 | 0,65 | 0,6 | 0,55 | - | 8,40 | |
Max radial clearance is based on DanaFlon 24 and 100 °C
For other hi-filled Danaflon compounds the clearance should be reduced with 10%
Clearance: At Pressure > 40 MPa use diameter tolerance H7/f7 (Bore/Rod)
Delivery times
For special requests, please complete our Request form or call us on +45 4922 4400.
