For Locking Levers see stock numbers ; 693-5163 693-5163 or ; 693-5176 693-5176. Harting SEK-18 Series 2.54mm Shrouded Headers with Straight Solder Pins. A range of Harting SEK Headers with straight solder pins 2.9 mm long. Performance level 2 PCB hole Ø 1± 0.1 mm