The MT Series rack & pinion actuators are the next generation of innovation featuring a slimmer body design while maintaining extensive options for easy valve integration, flexible customization, and the same reliable operation, all backed by the industry’s best unlimited cycle life warranty. Standard with NAMUR mounting for accessories, along with our patented ±10° adjustment for both the open and closed positions, the MT series is setting the standard.

Features and Benefits

Compact Design

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

Degree of Travel

The standard angle of rotation is 90°.  For sizes from MT08 through MT76, 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!

Honed Bore for High Cycle Life

Extruded aluminum 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 internal and external surfaces are hard anodized for corrosion resistance, with all units permanently lubricated at the factory.

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.

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.

Rugged Tooth Design

The pinion teeth are engaged the full length and stroke of the piston, and designed for the toughest flow conditions.  The pinion height allows manual override without needing to remove the indicator.

Multiple Output Shafts

The female 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.

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.

High Visibility Beacon

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

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 40 to 150 psi (2 to 10 Bar). 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.

Optional Accessories

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.

Quality Assurance

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


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

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.