Collection: Airtec Series ZDMO ISO 6432 Anti-Rotation Pneumatic Cylinders

Technical information & FAQs

Airtec ZDMO Anti-Rotation Pneumatic Cylinders

Airtec Series ZDMO pneumatic cylinders are designed for linear movements where the piston rod must extend and retract without allowing attached tooling to rotate freely. A hexagonal anti-rotation piston rod helps maintain the orientation of pushers, stops, locating components and other machine attachments throughout the stroke.

ZDMO retains the slim round-body format associated with Airtec's ISO 6432 pneumatic cylinders, making it particularly useful where both installation space and tooling alignment matter. Standard versions are double acting and magnetic, with a stainless-steel cylinder tube and piston rod for robust repetitive industrial movement.

For ordinary single-rod movement without anti-rotation, compare Airtec ZDM pneumatic cylinders. Where the application needs a piston rod extending from both ends, see Airtec ZDMK through-rod pneumatic cylinders.

Why Use an Anti-Rotation Pneumatic Cylinder?

A conventional round piston rod can rotate around its own axis unless the attached mechanism provides separate guidance. That may not matter when the rod simply pushes against a flat surface, but it becomes a problem when the rod carries tooling whose angular position affects the machine process.

Series ZDMO addresses that problem mechanically. The hexagonal piston-rod arrangement restricts rotation, helping attached tooling retain its orientation during extension and retraction.

This makes ZDMO particularly relevant to compact locating, pushing, indexing and positioning mechanisms where adding a separate external anti-rotation guide would increase component count and installation size.

Airtec ZDMO Technical Specification

Manufacturer	AIRTEC
Series	ZDMO
Product Category	Anti-rotation pneumatic cylinders
Dimensional Standard	ISO 6432
Verified Bore Sizes	16, 20 and 25 mm
Operation	Double acting
Anti-Rotation Design	Hexagonal piston rod
Position Detection	Magnetic piston on standard versions
Head and Foot	Anodised aluminium
Cylinder Tube	1.4301 stainless steel
Piston Rod	1.4305 stainless steel on verified standard versions
Seals	NBR / PUR
Maximum Working Pressure	10 bar
Standard Temperature Range	-20°C to +80°C
Special Options	FKM high-temperature and ATEX configurations available

Choose ZDMO When Tooling Orientation Matters

ZDMO becomes particularly valuable when a component attached to the piston rod has a defined top, bottom or angular orientation. Examples include shaped pushers, locating fingers, stops and tooling plates that must arrive at the workpiece in the same orientation on every cycle.

If rotation does not matter, the standard Airtec ZDM range may provide the simpler solution. The purpose of ZDMO is specifically to add resistance to piston-rod rotation while retaining compact pneumatic actuation.

ZDMO Bore and Connection Sizes

Bore	Pneumatic Connection	Rod Thread
16 mm	M5	M6
20 mm	G1/8	Check individual MPN
25 mm	G1/8	Check individual MPN

Verified 16 mm ZDMO products use an M5 air connection and M6 piston-rod thread. Airtec ZDMO 20 mm products use G1/8 pneumatic connections, while the exact rod and dimensional data should always be checked against the individual manufacturer part number before replacement.

Compact Stainless-Steel Round Construction

The standard ZDMO construction combines anodised aluminium end components with a 1.4301 stainless-steel tube and 1.4305 stainless-steel piston rod. This keeps the actuator slim while providing a durable industrial body for repetitive machine cycles.

The overall format also allows ZDMO to sit within the wider ISO 6432 pneumatic cylinder range, making it easier to compare other small-format pneumatic cylinders where a replacement or alternative is being investigated.

Magnetic Feedback for Automated Machinery

Standard verified ZDMO pneumatic cylinders incorporate a magnetic piston. Compatible cylinder switches can therefore monitor piston position as part of a PLC or machine-control sequence.

The combination of magnetic sensing and anti-rotation is particularly useful where the machine needs both confirmation of cylinder position and repeatable orientation of attached tooling.

Standard and High-Temperature ZDMO Options

Airtec offers FKM-sealed versions for higher-temperature applications, with verified catalogue data showing operation up to +150°C. These versions may differ from standard products in their magnetic sensing specification, so they should not be selected solely from bore and stroke.

ATEX-certified versions are also available for suitable hazardous-area applications. Preserve the relevant option suffix when replacing an existing specialist pneumatic cylinder.

ZDM, ZDMK or ZDMO?

Airtec Series	Key Mechanical Difference	Use It When...
ZDM	Standard single piston rod	A normal compact linear movement is required
ZDMK	Piston rod extends from both ends	The machine needs a mechanical connection on both sides
ZDMO	Hexagonal anti-rotation piston rod	Attached tooling must maintain its angular orientation

This is exactly why we are keeping these as separate Cylinder Warehouse series collections: the codes identify genuinely different mechanical functions, not merely cosmetic variants.

Getting a ZDMO Replacement Right

My current pneumatic cylinder has a hexagonal piston rod. Should I replace it with a standard round-rod ZDM?

Not if the machine relies on that hexagonal rod to stop the attached tooling rotating. The anti-rotation function is part of the ZDMO design and should be preserved unless separate external guidance is being added to the machine.

Does anti-rotation mean the cylinder can carry unlimited side load?

No. Preventing piston-rod rotation is not the same as providing a full external linear guide. Side loads, bending moments and tooling weight still need to remain suitable for the pneumatic cylinder and machine arrangement.

Could I use ZDMO instead of adding a separate anti-rotation guide?

In suitable light-duty applications, that is one of its main advantages. The hexagonal piston rod provides rotational restraint within the pneumatic cylinder itself, helping keep compact mechanisms simpler.

Where can I compare other Airtec pneumatic cylinder designs?

Return to the Airtec pneumatic cylinder hub for all Airtec ranges, or browse ISO 6432 pneumatic cylinders across manufacturers where dimensional alternatives are required.

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35 pneumatic cylinder products in this range.

Airtec
ZDMO16/10
16mm bore x 10mm stroke
ISO 6432 | ISO 6432 Pneumatic Cylinder
Manufacturer Part Number ZDMO16/10

£53.94 EX VAT

£64.73 INC VAT

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Airtec
ZDMO16/100
16mm bore x 100mm stroke
ISO 6432 | ISO 6432 Pneumatic Cylinder
Manufacturer Part Number ZDMO16/100

£63.62 EX VAT

£76.34 INC VAT

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Airtec
ZDMO16/125
16mm bore x 125mm stroke
ISO 6432 | ISO 6432 Pneumatic Cylinder
Manufacturer Part Number ZDMO16/125

£65.62 EX VAT

£78.74 INC VAT

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Airtec
ZDMO16/160
16mm bore x 160mm stroke
ISO 6432 | ISO 6432 Pneumatic Cylinder
Manufacturer Part Number ZDMO16/160

£69.29 EX VAT

£83.15 INC VAT

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Airtec
ZDMO16/200
16mm bore x 200mm stroke
ISO 6432 | ISO 6432 Pneumatic Cylinder
Manufacturer Part Number ZDMO16/200

£71.95 EX VAT

£86.34 INC VAT

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Airtec
ZDMO16/25
16mm bore x 25mm stroke
ISO 6432 | ISO 6432 Pneumatic Cylinder
Manufacturer Part Number ZDMO16/25

£57.55 EX VAT

£69.06 INC VAT

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Airtec
ZDMO16/250
16mm bore x 250mm stroke
ISO 6432 | ISO 6432 Pneumatic Cylinder
Manufacturer Part Number ZDMO16/250

£78.97 EX VAT

£94.76 INC VAT

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Airtec
ZDMO16/320
16mm bore x 320mm stroke
ISO 6432 | ISO 6432 Pneumatic Cylinder
Manufacturer Part Number ZDMO16/320

£105.80 EX VAT

£126.96 INC VAT

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Airtec
ZDMO16/40
16mm bore x 40mm stroke
ISO 6432 | ISO 6432 Pneumatic Cylinder
Manufacturer Part Number ZDMO16/40

£61.73 EX VAT

£74.07 INC VAT

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Airtec
ZDMO16/50
16mm bore x 50mm stroke
ISO 6432 | ISO 6432 Pneumatic Cylinder
Manufacturer Part Number ZDMO16/50

£60.39 EX VAT

£72.47 INC VAT

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Airtec
ZDMO16/80
16mm bore x 80mm stroke
ISO 6432 | ISO 6432 Pneumatic Cylinder
Manufacturer Part Number ZDMO16/80

£62.39 EX VAT

£74.87 INC VAT

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Airtec
ZDMO20/10
20mm bore x 10mm stroke
ISO 6432 | ISO 6432 Pneumatic Cylinder
Manufacturer Part Number ZDMO20/10

£61.53 EX VAT

£73.83 INC VAT

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Airtec
ZDMO20/100
20mm bore x 100mm stroke
ISO 6432 | ISO 6432 Pneumatic Cylinder
Manufacturer Part Number ZDMO20/100

£69.68 EX VAT

£83.61 INC VAT

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Airtec
ZDMO20/125
20mm bore x 125mm stroke
ISO 6432 | ISO 6432 Pneumatic Cylinder
Manufacturer Part Number ZDMO20/125

£71.68 EX VAT

£86.01 INC VAT

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Airtec
ZDMO20/160
20mm bore x 160mm stroke
ISO 6432 | ISO 6432 Pneumatic Cylinder
Manufacturer Part Number ZDMO20/160

£77.27 EX VAT

£92.72 INC VAT

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Airtec
ZDMO20/200
20mm bore x 200mm stroke
ISO 6432 | ISO 6432 Pneumatic Cylinder
Manufacturer Part Number ZDMO20/200

£80.39 EX VAT

£96.47 INC VAT

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Airtec
ZDMO20/25
20mm bore x 25mm stroke
ISO 6432 | ISO 6432 Pneumatic Cylinder
Manufacturer Part Number ZDMO20/25

£62.84 EX VAT

£75.41 INC VAT

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Airtec
ZDMO20/250
20mm bore x 250mm stroke
ISO 6432 | ISO 6432 Pneumatic Cylinder
Manufacturer Part Number ZDMO20/250

£90.74 EX VAT

£108.89 INC VAT

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Airtec
ZDMO20/320
20mm bore x 320mm stroke
ISO 6432 | ISO 6432 Pneumatic Cylinder
Manufacturer Part Number ZDMO20/320

£118.49 EX VAT

£142.19 INC VAT

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Airtec
ZDMO20/40
20mm bore x 40mm stroke
ISO 6432 | ISO 6432 Pneumatic Cylinder
Manufacturer Part Number ZDMO20/40

£66.75 EX VAT

£80.10 INC VAT

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Airtec
ZDMO20/50
20mm bore x 50mm stroke
ISO 6432 | ISO 6432 Pneumatic Cylinder
Manufacturer Part Number ZDMO20/50

£64.85 EX VAT

£77.82 INC VAT

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Airtec
ZDMO20/80
20mm bore x 80mm stroke
ISO 6432 | ISO 6432 Pneumatic Cylinder
Manufacturer Part Number ZDMO20/80

£67.98 EX VAT

£81.57 INC VAT

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Airtec
ZDMO25/10
25mm bore x 10mm stroke
ISO 6432 | ISO 6432 Pneumatic Cylinder
Manufacturer Part Number ZDMO25/10

£67.32 EX VAT

£80.78 INC VAT

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Airtec
ZDMO25/100
25mm bore x 100mm stroke
ISO 6432 | ISO 6432 Pneumatic Cylinder
Manufacturer Part Number ZDMO25/100

£77.92 EX VAT

£93.50 INC VAT

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Airtec
ZDMO25/125
25mm bore x 125mm stroke
ISO 6432 | ISO 6432 Pneumatic Cylinder
Manufacturer Part Number ZDMO25/125

£80.20 EX VAT

£96.24 INC VAT

View Details
Airtec
ZDMO25/160
25mm bore x 160mm stroke
ISO 6432 | ISO 6432 Pneumatic Cylinder
Manufacturer Part Number ZDMO25/160

£86.55 EX VAT

£103.86 INC VAT

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Airtec
ZDMO25/200
25mm bore x 200mm stroke
ISO 6432 | ISO 6432 Pneumatic Cylinder
Manufacturer Part Number ZDMO25/200

£90.92 EX VAT

£109.10 INC VAT

View Details
Airtec
ZDMO25/25
25mm bore x 25mm stroke
ISO 6432 | ISO 6432 Pneumatic Cylinder
Manufacturer Part Number ZDMO25/25

£69.03 EX VAT

£82.83 INC VAT

View Details