4-circuit spring-loaded piston at 0.100" pitch
The 821-22-004-10-000101 is the 4-contact member of Mill-Max's 821 series spring-loaded piston connectors, designed for through-hole mounting in a single row. Contacts are copper alloy with 20.0µin (0.51µm) gold finish, suited for repeated mating cycles in test or interconnect applications where wiping action maintains low resistance.
Pitch and footprint fit
At 0.100" (2.54mm) pitch, the 821-22-004-10-000101 shares the same board footprint as standard 0.100" headers — the single-row layout occupies minimal board edge and routes easily on two-layer boards.