Pan Washer Screw Slot Pozidriv Machine Thread Tapping Thread

Pan washer screw design could possibly be the most versatile head design available. Pan washer screw combines the advantages of the pan head but has a washer built on to the head to increase head diameter and prevent overdriving in softwoods while providing a maximum bearing surface. These fasteners have Square-Phillips combo recess drive designed to offer the dependability of a square drive recess with the convenience and after-market serviceability of a Phillips drive. In addition, they have coarse thread design for superior holding power while reducing splitting or crumbling of the material, allowing the fastener to install rapidly with full thread engagement after just one revolution. The thread surface is nearly perpendicular to the screw axis, providing great resistance to pullout. Ever Hardware provides custom-made fasteners and customizable packaging.

The Pozidriv is an improved version of the Phillips screw drive. Pozidriv was jointly patented by the Phillips Screw Company and American Screw Company. The name is thought to be a portmanteau of the words “positive” and “drive.” Its advantage over Phillips drives is its decreased likelihood to cam out, which allows greater torque to be applied. In ANSI standards, it is referred to as “Type IA.” It is very similar to, and essentially compatible with, the Supadriv screw drive.

Pozidriv drive bits are often designated by the letters “PZ” plus a size code of 0, 1, 2, 3, 4 or 5 (by order of increasing size); the numerical bit size codes do.

The slot screw drive has a single slot in the fastener head and is driven by a “common blade” or flat-bladed screwdriver. It was the first type of screw drive to be developed, and for centuries it was the simplest and cheapest to make.