The Centalic RQ75-SC is a press-in receptacle for the 75 mil (1.91 mm) grid with a solder-cup termination. It is pressed into the fixture's probe plate and the spring probe seats in it, so a worn probe can be replaced without unsoldering or rewiring the fixture.
It is the 75 mil member of Centalic's receptacle range, sitting between the 50 mil RQ50 and the 100 mil RQ100 bodies — the size to reach for when a board's test points are closer than a 100 mil field allows. The SC suffix marks the solder-cup termination, as against the wire-wrap (WW) versions elsewhere in the range.
FixturFab also stocks the Centalic RE75-SC and RE75-WW on the 75 mil grid; check the mounting and press-fit diameters against your plate drawing before substituting one for the other.
