1/4-20 x 3 Slotted Pan Machine Screw Fully Threaded Zinc C5FT and the 4 1/2 refers

and the 4 1/2 refers to the length of the bolt

Introducing the 5/16-18 x 1 3/4 Hex Cap Screw

or other surfaces

The 4-40 x 3/16 Phillips Full contour Truss Machine Screw Fully Threaded 18-8 SS Blk Oxide is a type of screw that is used in a variety of applications

It features four prongs that grip the material

1/4-20 x 3 Slotted Pan Machine Screw Fully Threaded Zinc C5FT and the 4 1/2 refersThis 1 4 20 x 3 Slotted Pan Machine Screw Fully Threaded Zinc is a versatile fastener designed for a wide range of applications. Its 1 4 20 thread size and 3 inch length provide a secure hold in various materials. The slotted pan head allows for easy driving and removal using a flathead screwdriver. Made from durable zinc, this screw resists corrosion and ensures longevity. Its fully threaded design offers maximum holding power and can be used in both