The 5.03 mm pitch matches the.093" diameter pin and socket contacts this series is named for — sized for moderate current, not fine-pitch signal density.
The housing ships empty. The note on the listing — Contacts Not Included — is the most common trip point for first-time buyers. Termination is crimp, which means you need the correct applicator tool for the wire gauge you are running.
Panel-Mount Snap-In — No Hardware Required
The snap-in feature uses integral nylon latches that deflect during insertion and spring back to hold the housing in place. The panel thickness range is not listed in the spec summary, but the snap-in design typically works with a standard sheet-metal thickness (0.030" to 0.060" range is common for this class of connector). The locking ramp on the mating face then secures the plug to the housing once mated.
The 770071-1 is listed as Active on the lifecycle record, with RoHS compliance confirmed.