The 640500-2: This is a through-hole solder header — the 0.150" (3.81 mm) post length fits standard PCB thicknesses; the 0.220" (5.59 mm) mating pin length engages with the matching receptacle. Full 4-wall shrouding with a latch lock prevents mis-mating and secures the connection under vibration — the latch audibly clicks when fully seated. The header accepts male pin contacts (circular, phosphor bronze) and mates with the corresponding MR series receptacle housing — confirm the mating half part number separately.
Compliance and sourcing reality
RoHS non-compliant (tin-lead post finish at 150.0 µin) — verify your application's exemption or plan for a RoHS-compliant alternate if required.
Compared to the 1318699-3 (same series, 6 positions, 4.20 mm pitch), the 640500-2 uses gold mating contacts (30.0 µin) versus tin — the gold version is preferred for higher mating cycle counts or corrosive environments. The 1-1871673-2 and 4-1775099-7 are also MR series 6-position headers but may differ in contact finish or packaging — confirm the specific plating and termination before substituting.