SS Series – Stainless Steel Actuators

The SS Series actuators take corrosion resistance to the extreme with all of the great engineering features that set us apart from the competition. Our stainless steel actuators conform to the ISO standard which makes valve automation easy and cost effective. Dual patented travel stops allow up to 110° of stroke in a 90° actuator, providing exceptional positioning adjustment.

Features and Benefits

Compact Design

The MAX-AIR Stainless Steel rack & pinion pneumatic actuator produces linear torque output in a compact design utilizing the same CF8M body and CF8M end caps for double-acting and spring-return units.

Namur Mounting

Namur VDI/VDE 3845 and ISO 5211 dimensions on all sizes. No special blocks are required to mount solenoid valves, limit switches or positioners.

Degree of Travel

The standard angle of rotation is 90°. For sizes from SS16 through SS66, Max-Air actuators feature dual travel stops that provide ± 10° stroke rotation on both the opening and closing phases of the actuator stroke. 110° of travel in a standard 90° actuator!

Multiple Output Shafts

The female 316 SS pinion drive is standard with a double-square output drive, and optional with a double-D drive, keyed drive and designs to meet your specific requirements.

Rugged Tooth Design

The pinion teeth are engaged the full length and stroke of the piston. The pinion height allows manual override without needing to remove the indicator.

High Visibility Beacon

External open/close indicator as standard, available for all rotations.

High Cycle-Life Wear Pads

Pistons incorporate double wear pads (skates) to separate the rack from the actuator wall and serve as both guide and wear bearings.

High-Cycle Bearings

Shaft bearings isolate the pinion gear from the housing and support the shaft for high-cycle applications. Many competitive manufacturers do not provide this critical feature.

Safe Preloaded Spring Cartridges

Epoxy-coated special steel springs are pre-loaded with non- metallic materials. The stainless steel end-cap fasteners are extra-long to allow for spring relaxation. All parts are corrosion-resistant.

Alternate Operating Media

Air pressure operation from 2 to 10 Bar (40 to 150 psi). Water, nitrogen and compatible hydraulic fluids may also be used to power the actuator.

Stainless Steel Fasteners

All external fasteners are corrosion-resistant stainless steel.

Honed Bore for High Cycle Life

CF8M Stainless Steel body is internally machined and honed to exact specifications. Honing prevents dry spots from forming within the actuator bore and therefore eliminates premature seal failure—a critical aspect to long cycle-life. All units are permanently lubricated at the factory.


All units are externally marked with a progressive traceable serial number.

Quality Assurance

100% of all units are factory pressure and leak tested, and individually boxed for shipment.

Best Warranty In The Industry

Max-Air products are covered by our unlimited cycle-life warranty. Contact your local distributor or sales representative for more details.


Max-Air offers a wide range of adapters for many different types of valves—including butterfly valves, ball valves and plug valves—as well as a variety of pneumatic and electric automation accessories suitable for diverse industrial environments.