Spring Characteristics and Force Tolerances of Gas Springs3883566
In contrast to most other types of springs, 10mm ball stud use a integrated pretension force plus a flat spring characteristic. Which means that there's only a small improvement in force between full extension and full compression.
Because the piston and piston rod are pressed into the cylinder, volume reduces and pressure increases. This causes pushing force to improve. In conventional gas-type springs, this increase is normally around 30% at full compression.
The pushing spring movement is slow and controlled. It is just a few the gas flow involving the piston sides being permitted to pass through channels inside the piston through the stroke. Conventional gas springs use 'hydraulic damping', involving a modest amount of oil slowing the rate of the stroke immediately prior to the spring reaches full extension. This provides the movement a braking character at the end position so long as the piston rod is within the downward direction.
Force tolerances when charging with gas as well as other factors mean that there may be variations within the force exerted by gas springs with the same nominal value.
The nominal values apply at 20° C, which is the temperature of which gas charging is carried out. Observe that when the ambient temperature rises or falls, the force with the spring rises or falls depending on pressure changes in the cylinder. Usually of thumb, gas spring force increases by approximately 3.5% per 10° C temperature increase and reduces accordingly if the temperature falls.