Fastener SuperStore, Inc. SEMS Screw 369505

M4-0.7 X 16 W9 SEMS Machine Screw / Phillips / Pan Hd / Double Washer (Flat / Split) / Steel / Zinc Yellow A cross-recessed, pan head machine screw with two free-spinning, captive washers. Directly below the pan head is a helical split lockwasher; beneath the split lockwasher is a round flat washer. The diameter and height of the pan head are between 5% and 20% smaller than a standard pan head. This double washer sems screw is typically a more economical alternative to a patented conical washer sems screw. They are commonly used in the electronics industry.