Keying plug for Universal MATE-N-LOK
The 770377-1 is a polarizing device — a keying plug — for the Universal MATE-N-LOK connector series, listed as active in production. It prevents mis-mating between identical-position-count housings by occupying one of the cavity positions, ensuring the plug and receptacle align only when the keying pattern matches.
Sibling keying plugs in the series
Two other active keying plugs share the same Universal MATE-N-LOK series: 1-640415-1 and 1-640415-0, both also polarizing devices in Bulk packaging. The 770377-1 is functionally equivalent — select by order code to match the existing BOM keying pattern.