1/4-20 x 3/8 Slot Ind Hex Wash Taptite Alternative Thread Roll Screw Fully Thrd Zinc & Wax APF188B It has a split lock

It has a split lock washer and a regular flat washer

preventing it from pulling through the material it is being screwed into

The indented hex washer head provides a large surface area for driving

This 1/2 x 1

7 x 40 ISO14581 Metric 6-Lobe Flat Machine Screw Full Thread 18-8 Stainless Steel is a versatile and durable fastener designed for various applications

1/4-20 x 3/8 Slot Ind Hex Wash Taptite Alternative Thread Roll Screw Fully Thrd Zinc & Wax APF188B It has a split lockThe 1 4 20 x 3 8 Slot Ind Hex Wash Taptite Alternative Thread Roll Screw Fully Thrd Zinc & Wax is a high performance screw designed for use in a variety of applications. It features a 1 4 20 thread size, a 3 8 inch length, and a slotted hex washer head. The screw is made of steel and has a zinc and wax coating for corrosion resistance. It is also self tapping, which means it can create its own threads in the material it is being driven into. This