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
Type	ROD Ø C f8	GROOVE DIA D H9	GROOVE WIDTH L + 0.2	RADIUS R	BORE DIA A + 0.3	X MIN	SERIES	C/S
M76A	6 - 11.9	C + 4.8	3.7	0.4	C + 1.5	3	000	1.78
M76B	12 - 64.9	C + 6.8	5.0	0.7	C + 1.5	3	100	2.62
M76C	65 - 250.9	C + 8.8	6.0	1.0	C + 2.0	4	200	3.53
M76D	251 - 420.9	C + 12.2	8.4	1.2	C + 2.5	5	300	5.33
M76E	421 - 650.9	C + 16.0	11.0	1.5	C + 2.5	8	400	7.00
M76F	651 - 999.9	C + 20.0	14.0	2.0	C + 2.5	10	500	8.40

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
Type	ROD Ø C f8	GROOVE DIA D H9	GROOVE WIDTH L + 0.2	RADIUS R	BORE DIA A + 0.3	X MIN	SERIES	C/S
M77A	6 - 11.9	C + 4.8	3.7	0.4	C + 1.5	2	000	1.78
M77B	12 - 64.9	C + 6.8	5.0	0.7	C + 1.5	2	100	2.62
M77C	65 - 250.9	C + 8.8	6.0	1.0	C + 1.5	3	200	3.53
M77D	251 - 420.9	C + 12.2	8.4	1.2	C + 2.0	3	300	5.33
M77E	421 - 650.9	C + 16.0	11.0	1.5	C + 2.0	4	400	7.00
M77F	651 - 999.9	C + 20.0	14.0	2.0	C + 2.5	5	500	8.40

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