Board-fit reality and the 4-loaded cavity
The 1-1318301-4: This is a single-row header with 7 positions in the housing, but only 4 of those positions are loaded with a contact. The other three cavities are empty — the buyer needs to confirm whether the BOM calls for 7 circuits or 4, because the part number covers both the populated and unpopulated slots. The 3.96mm pitch (0.156 inch) is a standard Economy Power spacing, matching the mating receptacle housing and its crimp terminals. The header stands 14.40mm overall contact length, with the mating pin extending 7.70mm into the receptacle.
Current rating and temperature ceiling
Rated 7.5A per circuit at 250VAC, but the operating temperature range tops out at 105°C. In a warm enclosure the per-contact current should be derated — the PBT housing (UL94 V-0) softens well before the 105°C limit, so the practical working current in a 105°C ambient is lower than 7.5A.
Friction lock — what it holds and what it does not
The shrouded wall with a friction lock keeps the mating housing from backing off under light vibration, but this is not a positive locking ramp. If the application sees shock or cable pull, a secondary retention method (cable tie, clamp) is needed.