Ring terminal for 14-16 AWG
The 42751-1: The brass contact is 0.030" (0.76mm) thick and the terminal accommodates an insulation diameter of 0.120" to 0.180" (3.05mm to 4.57mm).
Comparing with similar ring terminals
The 42751-1 has a wider outer edge (0.470") and accepts a larger insulation diameter than the 140546 (0.342" width, 0.098" to 0.138" insulation range), making it suited for heavier wire insulation. The 640102-1 shares the same 0.030" thickness and non-insulated construction but accepts 14-18 AWG wire and a slightly larger insulation diameter (0.140" to 0.190").