ISO 6431-VDMA Cylinders – K & KD Series

K series cylinders are designed in accordance with ISO-15552 (which supersedes ISO 6431) & VDMA 24562 allowing complete interchangeability with other manufactures cylinders which are made to the same standards. The new ISO 15552 standard covers all mountings and external dimensions.

High Speed Design
The cylinders incorporate unique mechanical buffer seals, which are designed to absorb energy but ensure seal over compression is avoided. This feature enables higher operational speeds and enhances the life of the cylinder. Unlike the majority of our competitors the inlet ports have full bore access for rapid acceleration, without causing catastrophic failure and allowing low noise operation. Conventional cylinders incorporate standard magnets for end of stroke sensing but at high speeds these are susceptible to fatigue due to the brittle nature of magnets. K series cylinders are equipped with plastoferrite magnetic rings, which are flexible and ideal for high speed operation.

High Efficiency Adjustable
K series cylinders incorporate floating cushion seals which provide bubble-tight sealing characteristics even under side load conditions. This feature ensures the maximum amount of air is captured to allow accurate end-of-stroke deceleration.

Low Operating Noise Levels
Reduced noise levels (lower than 50 dB) are achieved due to several design features. Firstly, synthetic rubber shock absorbers are fitted in each end cap to avoid mechanical stress and reduce machinery noise. Low friction seals and technopolymer wear rings, further reduce noise levels.

Self-compensating Seals
The piston and cushion seals are made from a wear-resistant nitrile rubber compound suitable for applications with or without lubrication. The double lip seal design automatically self-compensates against wear.


Technical Data
Type Air cylinder
Bore (mm) 32 / 40 / 50 / 63 / 80 / 100 / 125 / 160 / (Ø 200 K Series only)
Mounting In accordance to ISO 15552, ISO 6431 & VDMA 24562
Stroke 3 metre (max)
Operating Pressure 1.5 – 10 bar
Outer chamber fluid Compressed air, Filtered 50µ. Use with or without lubrication
Operating temperature Max +80° Min -20°
Barrel Type All bore sizes utilise non tie-rod extrusion with the exception of Ø160 & 200 mm cylinders which utilise aluminium tube and steel tie-rods