Hydraulic Seals - Wipers Scrapers

M76 is a double wiper with two geometrically profiled wiper lips and an O-ring energiser.

M77 as type M76 but only single wiper.

Advantages Surface Roughness Operating Ranges
  • Very good external wiping effect even when subject to firmly adhering dirt and ice
  • Very good internal wiping effect even when subject to firmly adhering dirt and ice
  • Abrasion resistant
  • Low friction
  • Available up to 2000mm diameter
  • Cylinder/bore: Ra=0.05 - 0.5µm
  • GrooveØ: Ra<2.5µm
  • Groove walls: Ra<4µm
  • Reciprocating up to 15m/s
  • Temperature from -60°C to +200°C limited by O-ring material
Table for Type M76
Type ROD Ø
C f8
GROOVE
DIA D H9
GROOVE
WIDTH
L + 0.2
RADIUS
R
BORE
DIA A + 0.3
X MIN O-RING
C/S INSIDE Ø = C+
M76A 19 - 39.9 C + 7.6 4.2 0.8 C + 1.0 3 1.78 2.5
M76B 40 - 69.9 C + 8.8 6.3 0.8 C + 1.5 3 2.62 3.5
M76C 70 - 139.9 C + 12.2 8.1 1.5 C + 2.0 4 3.53 4.0
M76D 140 - 399.9 C + 16.0 9.5 1.5 C + 2.5 5 5.33 4.0
M76E 400 - 649.9 C + 24.0 14.0 1.5 C + 2.5 8 7.00 5.0
M76F 650 - 999.9 C + 27.3 16.0 2.0 C + 2.5 10 8.40 6.0
Table for Type M77
Type ROD Ø
C f8
GROOVE
DIA D H9
GROOVE
WIDTH
L + 0.2
RADIUS
R
BORE
DIA A + 0.3
X MIN O-RING
C/S INSIDE Ø = C+
M77A 6 - 11.9 C + 4.8 3.7 0.4 C + 1.5 2 1.78 2.0
M77B 12 - 64.9 C + 6.8 5.0 0.7 C + 1.5 2 2.62 3.0
M77C 65 - 250.9 C + 8.8 6.0 1.0 C + 1.5 3 3.53 4.0
M77D 251 - 420.9 C + 12.2 8.4 1.2 C + 2.0 3 5.33 4.0
M77E 421 - 650.9 C + 16.0 11.0 1.5 C + 2.0 4 7.00 5.0
M77F 651 - 999.9 C + 20.0 14.0 2.0 C + 2.5 5 8.40 6.0

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