Hydraulic Seals

M70 and M71 are double acting seals. They have been used successfully for many years to seal the rods and pistons for working cylinders.

Well proven in the hydraulic and pneumatic fields as well as general engineering, these robust seals offer designers an excellent choice of sealing components.

Advantages Surface Roughness Operating Ranges
  • Excellent anti-friction characteristics
  • No stick-slip effect during start up
  • No adhestion effect
  • Can be used in dry and lubricated media
  • Single piece piston and cylinder head poss.
  • Available up to 2000mm diameter
  • Compacy simple groove design
  • Cylinder/bore: Ra=0.05 - 0.6µm
  • Rod/shaft: Ra=0.05 - 0.5µm
  • GrooveØ: Ra<2.5µm
  • Groove walls: Ra<4µm
  • Reciprocating up to 800 bar and 15m/s
  • Temperature from -60°C + 200°C limited by the O=ring material
M70: ROD DIAMTER C f8/h9
HEAVY DUTY M70A STANDARD DUTY M70B LIGHT DUTY M70C GROOVE DIA D H9 GROOVE WIDTH L + 0.2 DIAMETRAL CLEARANCE EMAX (BAR) RADIUS R O-RING SERIES O-RING
0-200 200-400 C/S INSIDE Ø = C+
  3 - 7.9 8 - 18.9 C+4.9 2.2 0.6 - 0.4 0.4 - 0.3 0.3 - 0.5 000 1.78 2.0
  8 - 18.9 19 - 37.9 C + 7.3 3.2 0.8 - 0.5 0.5 - 0.3 0.5 - 0.8 100 2.62 3.5
8 - 18.9 19 - 37.9 38 - 199.9 C + 10.7 4.2 0.8 - 0.5 0.5 - 0.4 0.8 - 1.2 200 3.53 5.0
19 - 37.9 38 - 199.9 38 - 199.9 C + 15.1 6.3 1.0 - 0.6 0.6 - 0.4 1.2 - 1.5 300 5.33 7.0
38 - 199.9 200 - 255.9 200 - 255.9 C + 20.5 8.7 1.0 - 0.6 0.6 - 0.5 1.5 - 2.0 400 7.00 9.5
200 - 255.9 256 - 649.9 256 - 649.9 C + 24.0 8.1 1.2 - 1.0 1.0 - 0.6 1.5 - 2.0 400 7.00 13.0
256 - 649.9 650 - 999.9   C + 27.3 9.5 1.4 - 1.0 1.0 - 0.7 2.0 - 3.0 500 8.4 14.5
M71: BORE DIAMTER A H9
HEAVY DUTY M71A STANDARD DUTY M71B LIGHT DUTY M71C GROOVE DIA D H9 GROOVE WIDTH L + 0.2 DIAMETRAL CLEARANCE EMAX (BAR) RADIUS R O-RING
0-200 200-400 SERIES C/S
  8 - 14.9 15 - 39.9 A - 4.9 2.2 0.6 - 0.4 0.4 - 0.3 0.3 - 0.5 000 1.78
  15 - 39.9 40 - 79.9 A - 7.5 3.2 0.8 - 0.5 0.5 - 0.3 0.5 - 0.8 100 2.62
15 - 39.9 40 - 79.9 80 - 132.9 A - 11 4.2 0.8 - 0.5 0.5 - 0.3 0.8 - 1.2 200 3.53
40 - 79.9 80 - 132.9 133 - 329 A - 15.5 6.3 1.0 - 0.6 0.6 - 0.4 1.5 - 2.0 400 5.33
80 - 132.9 133 - 329.9 330 - 669.9 A - 21 8.1 1.0 - 0.6 0.6 - 0.4 1.5 - 2.0 400 7.00
133 - 329.9 330 - 669.9 670 - 999.9 A - 24.5 8.1 1.2 - 1.0 1.0 - 0.6 1.5 - 2.0 400 7.00
330 - 669.9 670 - 999.9   A - 28 9.5 1.4 - 1.0 1.0 - 0.7 2.0 - 3.0 500 8.4

As a guide, the O=Ring ID for type M71 should be equal to or up to less than 5% of the groove Ø B

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