QA Technology's high preload springs give an additional solution in solving today's challenging test environments, such as excessive fluxes and contaminants in Pb-free, organic solderability preservatives (OSP) and No-Clean processes. QA's high preload springs offer a higher force during the first 2/3rd of actuation, resulting in better probe tip penetration and higher first-pass yields. The force is also more consistent when the probe travel is affected by variations due to board flex, fixture tolerances and target heights. Below is an example of our 100-25 spring force options with the high preload springs highlighted. Please see applicable product series for availability and offered tip styles.