It carries a 5.08mm pitch across two rows, with a 5.08mm row spacing that matches the D-3500 receptacle footprint. This is a panel-mount plug — it snaps into a panel cutout and accepts crimp terminals, so the harness is built off-line and then installed as a finished assembly.
The listing plainly states "Contacts Not Included" — and it means it. This housing ships empty. You need to order the male crimp pins separately, sized for your wire gauge. The Dynamic D-3500 terminal family uses a stamped-and-formed pin that crimps onto the wire and then locks into the housing cavity. Ordering the housing without the terminals is a common BOM miss; the harness can't be assembled until both arrive.
What the 5.08mm Pitch Means for Your Layout
The 5.08mm pitch is the same as 0.200 inches — a standard industrial spacing that gives enough creepage for the 600V rating typical of the D-3500 series without forcing an oversized connector. The dual-row layout with 20 positions means the housing is about 50.8mm wide across the rows, which fits a standard panel cutout. The row spacing is also 5.08mm, so the contact grid is square. If you're replacing a 917240-8 (the 20-position receptacle), this plug mates directly with it — same pitch, same row count, same keying.