An externally threaded fastener with a dome-shaped head and an integrally formed washer; a recess that can accommodate a Phillips screwdriver, and a single lead thread. The shank has a reduced diameter. Applications / Advantages - The deeper thread design offers greater resistance to pull-out forces. The round washer head is preferable in softer woods and offers a greater bearing surface than a countersunk design. It is superior to countersunk or pan heads at pulling material together.