1/4-20 x 1 1/2 Six Lobe Pan Floor Board Screw Type F Fully Threaded Black Phosphate PSW14410 These 8-18 x 2 1/2

These 8-18 x 2 1/2 Slotted Indented Hex Washer Self Drilling Screw Full Thread Zinc & Bake are designed for use in a variety of applications

The 1/4-20 x 1/2 Six Lobe Flat Floor Board Screw Type F Black Phosphate is a small

The head is an un slotted indented hex washer head

The 2-56 x 3/8 6-Lobe Pan Machine Screw Fully Threaded 18-8 Stainless Steel is a small

They are also commonly used in automotive

1/4-20 x 1 1/2 Six Lobe Pan Floor Board Screw Type F Fully Threaded Black Phosphate PSW14410 These 8-18 x 2 1/21 4 20 x 1 1 2 Six Lobe Pan Floor Board Screw Type F Fully Threaded Black Phosphate This screw is designed for use in floor board applications. It has a 1 4 20 thread size and is 1 1 2 inches long. The six lobe pan head provides a secure hold and prevents the screw from slipping. The fully threaded design ensures maximum holding power. The black phosphate finish provides corrosion resistance and a professional appearance.