Stop Tube Recommendations for Air and Hydraulic Cylinders

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Engineering Information:

A Stop Tube is a construction feature recommended for use in certain single rod end cylinders when the calculated Value of “L” exceeds a minimum level.

Its function is to increase the distance between the piston and rod bearing support surfaces when the stroke is fully extended. This added distance improves the structural rigidity of the assembly, increases rod buckling resistance, and reduces the possibility of bearing surface overloads.

Stop Tube design information is explained in greater detail on the following page. This data should be reviewed to gain information on construction variations and order options applicable when the use of a Stop Tube is indicated.

Stop Tube use recommendations can be determined by following the same procedure explained on the preceding page pertaining to the selection of the Piston Rod Diameter.

Steps 1 and 2 relate to Stop Tube requirements. The calculated Value of “L” should be located in the charted information below to find the suggested Stop Tube length. If the use of a Stop Tube is indicated, the original Value of “L” should be adjusted to include this additional length and rechecked to determine any possible effects on the selected rod diameter or Stop Tube requirements.

Cylinders with Fixed, Rigid Mounting Styles (groups headed by Models “A” and “C” in chart on preceding page) used with Class II and III Rod End Connections usually do not require the use of Stop Tubes. However, if the cylinder stroke is very long, or other conditions exist which may be improved by use of a Stop Tube, its inclusion may be warranted in view of those con- ditions as a matter of customer preference.

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