Board Fit and Contact Finish
The 2355181-2: The 0.110 inch (2.79 mm) solder post length suits standard through-hole boards; the 0.157 inch (4.00 mm) mating pin length engages with socket connectors of the same pitch. Mating surface is gold-plated to 15.0 µinch (0.38 µm) over copper alloy — a finish grade that handles repeated insertion cycles without contact fretting in moderate environments. The solder tails are tin-plated (78.7 µinch, 2.00 µm) for reliable soldering to the PCB.
