Why are there flat head and Phillips head screws?

Shamelessly ripped off from here, looks like the primary reason why we still have "bad" screws (flat head and Phillips) is that the "better" types of screws are simply more difficult/expensive to manufacture: The reason for the different styles is cost and torque.

What is the purpose of a flat head screw?

Flat head screws are used a lot in the building industry for cabinets, countertops, stairs, furniture, drywall and other components. Flat head screws are ideal for these applications because they're flush with surface.

Why do Phillips head screws exist?

In the early 1930s, the Phillips head screw was invented by Oregon businessman Henry Phillips (1889–1958). Automobile manufacturers now used car assembly lines. They needed screws that could take greater torque and could provide tighter fastenings.

Why are there 2 screw heads?

Answer: The primary reason for the wide variety of screw head drive types is to ensure the fact that you will never have the proper screwdriver close at hand when you need it.

Why is it called a flat head screwdriver?

Features of a Slotted Flat Blade Screwdriver

A "slotted flat blade screwdriver" is a long standard hand-tool dating back to the 1500s. It has a flat-bladed tip used to turn, fasten or loosen screws and bolts.

What is a Phillips flat head screwdriver?

The Phillips head screwdriver was created and patented by Henry Phillips in the 1930s and was originally used on the 1936 Cadillac. The great thing about it is that unlike the flat head screw (with a single ridge at its tip to slide into a screw with one slot), the Phillips screwdriver is self-centering.

What is slotted screw?

Slot. Slot screw drives have a single horizontal indentation (the slot) in the fastener head and is driven by a "common blade" or flat-bladed screwdriver. This form was the first type of screw drive to be developed, and for centuries, it was the simplest and cheapest to make.

Why do star screws exist?

The Star (also known as Torx) has a six-point, star-shaped drive that was developed mainly to enhance tamper resistance and ensure snug fits. The star design drivers cut down on the risk stripping the screw heads, slippage, or cam-outs, with tight, specific fits.

Why are there different bolt heads?

Bolts, as well as screws, are available in a vast variety of head shapes. These heads are made in order to grip the tools that are used to tighten them. The most common type of bolt head types includes square, hex, slotted hex washer, and socket cap.

Who invented Phillips head screws?

The Phillips screw and driver, originally invented by Portlander John P. Thompson, dramatically increased the speed of manufacturing and made the Phillips screwdriver a necessity in every toolbox.

Who invented the screw thread?

“But many consider that the screw thread was invented around 400 BC by [Greek philosopher] Archytas of Tarentum, who has often been called the founder of mechanics and considered a contemporary of Plato,” Eccles writes on his website.

Why do people still use slotted screws?

Because they don't strip nearly as easily as Philips-heads do, particularly if the p-h is on decorative brass hardware. That point made by the X in a p-h is very fragile and easy to destroy unless the screw is hardened steel.

Which is better flathead or Phillips?

Only the strongest flathead driving bits are used for high-torque manufacturing processes. By comparison, a Phillips screwdriver is very well-suited for industrial processes.

Why are there 2 types of screws?

The reason for the different styles is cost and torque. Phillips screws are self-centering, making powered screwdrivers possible. They're somewhat more expensive to produce than slotted-head. They tend to 'cam-out' easily under torque, making it hard to apply much torque.

Why are decking screws square?

Deck screws have square heads to increase the engagement of the driver bit in the head of the screw. This enables the screw to be driven in with less torque and less cam out, which will chew up the head of deck screws made from softer, corrosion-resistant metals. Screw extraction is also easier.

Why are decking screws different?

Deck screws are stronger than wood screws and are often made from copper or stainless steel. Their corrosion-resistant properties make them ideal for outdoor use. On the other hand, wood screws are mostly made from steel and have a flat head as well as an unthreaded shank that make strong joints.

What are the 3 types of screw heads?

Types of Screw Heads/Screw Drives

• Step 1: Slotted. Slotted screws are the simplest type of screw, consisting of a single slot at the head of the screw. ...
• Step 2: Phillips. The Phillips screw, named after Henry F. ...
• Step 3: Square Aka "Robertson" ...
• Step 4: Torx Aka "Star" ...
• 19 Comments.

What is a screw with a flat head called?

Flat Head Screws, also called Countersunk Screws, are conical with a flat outer face and a tapering inner face. An advantage to this type of screw is that very little of the head protrudes beyond the surface, allowing it to sink into the material. These screws are commonly made out of stainless steel or zinc coating.

Why are there different types of screwdriver?

The different types of screwdriver are primarily down to the drive tip shape required for a specific head type of a given screw. However, there are other types of screwdriver that are application-specific which will be detailed in this section. This screwdriver type is probably the most common form of hand tool.

What is the difference of Philips screw and star screw?

The crosshead style of screw is best suited for power driving. Phillips and posidrive screws are two types of crosshead screws, different from each other in that the Phillips screw head has four cross points and the posidrive screw head has a star with eight points.

When did cross head screws come out?

To counteract these disadvantages, J. P. Thompson patented a screw with a cross recess in 1933. He sold the patent to the Phillips Screw Company. It improved the profile and introduced the screw to the market in 1936/37.

Why do electricians use flat head screws?

Originally posted by JasonF: Flat head screws are good for wood as they prevent overtightening and thus help prevent stripping.

Are Phillips screws designed to strip?

The popular myth that these screws were designed to cam out is simply untrue. This is a good ol' case of revisionist history that was used to sell more screws. The idea being that the screw would strip when unskilled laborers over tightened it, thus protecting the expensive machined parts.