4-position header with a 0.250-inch pitch and a locking ramp
The 643415-1: This is a 4-position, single-row, through-hole header from the Universal MATE-N-LOK series — a board-to-cable/wire interconnect where the locking ramp holds the mating plug in place against cable pull and vibration. The 0.250" (6.35 mm) pitch sets the board footprint and the per-contact current ceiling; at this pitch, the tin-plated phosphor bronze contacts carry the rated load without exceeding the housing's thermal limits.
What the locking ramp and tin plating mean for the fit
The locking ramp provides a positive audible latch when mated with the corresponding Universal MATE-N-LOK plug housing — this is the primary retention mechanism in a vibration-prone environment like an appliance or industrial control panel. Tin-on-tin contact finish is rated for moderate mating cycles (typically 25–50 cycles in this series) and suits applications where the connector is mated during assembly and rarely disconnected in the field. The board guide helps align the header during wave-solder insertion, reducing the chance of bent pins on the through-hole tails.
Temperature range and housing material
The nylon (polyamide) housing carries a UL94 V-2 flammability rating — acceptable for equipment inside an enclosure where a V-0 rating is not mandated.