Why do we have philip screws and common screws instead of a universal screw?

Answer 1

It goes to more than just slotted and phillips screw heads... there are square and clutch drive heads, torx, hex heads, etc... most of it depends on the size of the head youve got to work with... and its function. Torx screws for instance, were first used in automobiles, to force the vehicle owner to go to the dealer for service, hehehe.

I prefer to use the square drive heads myself, but not all screw heads are large enough for that...you have to have a certain amount of depth to the screw head to be able to use square drive, or phillips bits. A slotted screwhead can be used on the smallest of screws.

Most electrical connections are made with slotted screwheads (outlets, switches, etc)

Phillips bits were manufactured because they are better at holding the bit in the screw with increased torque. A flat blade screwdiver (or bit) will usually spin out of the screw head with higher torgue... it actually gets harder to hold it in place.

Then... youve got the shape of the screw (or bolt). The underside of the screw head is shaped to do different things.... an electrical connector, for instance, has a flat underside (called a 'panhead') If you want to drive a screw flush with the surface of wood, you'd use a 'flat head', which has a cone shaped underside, to allow the screw to grip with even pressure, all the way around. Some of these kind of screws even have a small 'blade' cut into the side of them, to help them get seated.

Drywall screws are actually 'bugle' shaped, so they won't tear the paper cover on the dry wall.

Bottom line... look at what you want to do... then use the screw that fits your method best. =D

Have Fun!

Answer 2

Phillips screwdrivers and robertson screwdrivers (Phillips look like an X, Robertson look like a square) are both patented by their maker. They have benifits and drawbacks to their design

When stripped, phillips are easier to temporarily repair and remove (use a file to re-make a groove)
Robertson are easier to use. The square design allows the screw to "grip" the driver so can be applied with one hand at most angles.

Answer 3

Flat blade screwdrivers were being used before the much better [in my opinion] Phillips screw driver was invented. Phillips screws and screwdrivers are newer and better/easier to use.

Answer 4

It's not as uncommon as you may think. There's actually a similar situation on Teen Mom. You aren't related so it is normal to have an attraction to someone living under the same roof and attending other family events as you - you have something in common. You and your father both have good taste.

Answer 5

There are also about two dozen other types of specialty screws available. Many of them are made only by one manufacturer. My favorite: square drive, because the bit will never slip out of them.