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

Extreme chemical resistance
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Advantages:

Applications

Working conditions:

Frequently used - DanaFlon Material
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
Alternative solution - DanaFlon Material
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

Recommended finish for dynamic sealing surface *
  • Ra max (0.2 μm)
  • Rz max (1.25 μm)
  • Rp max (0.63 μm)
  • 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)

Order example - DanaStep for 30 mm rod:

Delivery times

For special requests, please complete our Request form or call us on +45 4922 4400.