Measuring .078 in. in diameter and .055 in. ± .002 in. tall, Model 1578-3-57-15-00-00-03-0 SMT Disc features flat surfaces on both sides with virtually no burrs. Flat surfaces are suitable for surface mount soldering and as conductive mating surface for spring-loaded pins and connectors as well as test probes. Machined from brass, discs come standard with 10 µin. hard gold finish with nickel under-plate. Discs are typically placed on solder pasted PCB pads and then subjected to reflow soldering.