Double Acting/Rotary

M74 and M75 are double acting seals for rotary rod and piston designs, rotary distributors for example.

Advantages	Surface Roughness	Operating Ranges
Excellent anti-friction characteristics No stick-slip effect during start up No adhesion effect Can be used in dry and lubricated media Single piece piston and cylinder head possible Available up to 2000mm diamteter Compact simple groove design	Cylinder/bore: Ra=0.05 - 0.4µm Rod/shaft: Ra=0.05 - 0.4µm GrooveØ: Ra<2.5µm Groove walls: Ra<4µm	Up to 300 bar Oscillatory up to 5m/s, intermittent. continuous up to 1m/s Temperature from -60°C to 200° limited by the O-ring material

Table for Type M74
Type	ROD DIA C f8	Groove DIA D H9	Groove Width L + 0.2	Diametral Clearance Emax (BAR)		Radius	O-Ring
				0 - 150	150 - 300		Series	C/S
M74A	8 - 18.9	C + 4.9	2.2	0.4 - 0.25	0.25 - 0.15	0.3 - 0.5	000	1.78
M74B	19 - 37.9	C + 7.5	3.2	0.6 - 0.40	0.40 - 0.20	0.5 - 0.8	100	2.62
M74C	38 - 199.9	C + 11.0	4.2	0.6 - 0.40	0.40 - 0.20	0.8 - 1.2	200	3.53
M74D	200 - 255.9	C + 15.5	6.3	0.8 - 0.55	0.55 - 0.30	1.2 - 1.5	300	5.33
M74E	256 - 649.9	C + 21.0	8.1	0.8 - 0.55	0.55 - 0.30	1.5 - 2.0	400	7.00
M74F	650 - 999.9	C + 28.0	9.5	1.2 - 0.85	0.85 - 0.50	2.0 - 3.0	500	8.40

Table for Type M75
Type	Cylinder DIA A H9	Groove DIA B H9	Groove Width L + 0.2	Diametral Clearance Emax (BAR)		Radius	O-Ring
				0 - 150	150 - 300		Series	C/S
M75A	8 - 18.9	A - 4.9	2.2	0.4 - 0.25	0.25 - 0.15	0.3 - 0.5	000	1.78
M75B	19 - 37.9	A - 7.5	3.2	0.6 - 0.40	0.40 - 0.20	0.5 - 0.8	100	2.62
M75C	38 - 199.9	A - 11.0	4.2	0.6 - 0.40	0.40 - 0.20	0.8 - 1.2	200	3.53
M75D	200 - 255.9	A - 15.5	6.3	0.8 - 0.55	0.55 - 0.30	1.2 - 1.5	300	5.33
M75E	256 - 649.9	A - 21.0	8.1	0.8 - 0.55	0.55 - 0.30	1.5 - 2.0	400	7.00
M75F	650 - 999.9	A - 28.0	9.5	1.2 - 0.85	0.85 - 0.50	2.0 - 3.0	500	8.40

As a guide, the O-Ring ID for type M75 should be equal to or up to less than 5% of the goove Ø B.

Tel: 01623 751515 | Downloads | Contact Us

Tel: 01623 751515 | Fax: 01623 753167 | Downloads | Contact Us | Profile