Faston PIDG female terminal, 0.110" tab
The 8-1377174-4: The non-mating end is insulated (color-coded red), the contact is tin-plated phosphor bronze, and termination is by crimp for free-hanging inline use.
Tab thickness variants in the 0.110" width
Both the 8-1377174-4 and the 8-1377174-3 share the same tab thickness, wire gauge, and insulation; the 8-1377174-3 uses a brass contact instead of phosphor bronze.
