A Flat Leaf Screw is a special type of fastener that is designed with a flat, leaf-like look for the purpose of spreading the load uniformly. While the ordinary screw has only a helical thread with a small diameter, which is less resistant to shear forces, the flat leaf increases the grip and decreases the stress concentration. https://www.dalloyedbolts.com/flat-leaf-screw-manufacturers-suppliers-stockists-exporters.html