What are Robertson screws used for?
Combination Robertson/Phillips drives are often used in the electrical trade, particularly for device and circuit breaker terminals, as well as clamp connectors. Robertson screwdrivers are easy to use one-handed, because the tapered socket tends to retain the screw, even if it is shaken.
What is a square headed screw?
The square-head screw was invented by P. I. Robertson, a Canadian, in 1908. It offered a big advantage over the slotted screw head because it was self-centering and not prone to slipping when driven. A new hybrid screw-head design is a square-drive screw that, in a pinch, allows you to use a Phillips driver.
What is a Robertson drill bit?
The Robertson screwdriver, also known as a square screwdriver, was invented in 1908 by P.L. Robertson, a native Canadian. Robertson’s design depended on the corresponding square shape on the top of screws that enabled the square-shaped screwdriver to make secure contact with the screw.
Why do we still use flathead screws?
The slotted head screw (commonly but incorrectly called a flat head) is the oldest type of screw in use today. Now, they are mostly used for decorative purposes and have less “impact”. Many people think they are used on light switch covers still for this reason.
Why does Canada use Robertson screws?
Phillips had invented another kind of socket screw and had no such reservations. Although the Robertson screw is most popular in Canada, it is used extensively in boat building because it tends not to slip and damage material, it can be used with one hand, and it is much easier to remove/replace after weathering.
How do you unscrew a Robertson screw?
Extracting Phillips, Torx and Robertson Screws A nail. Some nails have a burr on the point, which makes them able to grip the inside of the slot. Hold the nail with a pair of pliers to turn it. Tapping the nail into the screw with a hammer may improve the grip.
Why are there both Phillips and flat head screws?
Phillips were designed* to cam out and prevent over tightening. Robertson and torx were designed specifically to not cam out. Security heads are designed to make it difficult for the average user to remove the fastener.
What are Robertson screws?
Robertson screw. noun. trademark a screw having a square hole in the head into which a screwdriver with a square point (Robertson screwdriver (trademark)) fits.
What is a Robertson tip screwdriver?
Robertson screwdriver(Noun) A type of screwdriver having a square tip, designed to drive a Robertson screw.
What is an allen head screw?
• ALLEN SCREW (noun) The noun ALLEN SCREW has 1 sense: 1. a screw with a hexagonal hole in the head. Familiarity information: ALLEN SCREW used as a noun is very rare.
What is a Robertson bit?
Also known as Robertson bits these are designed for screws with a square recess in the head. These sets include an adjustable torque driver, bits for different drive styles, and a socket adapter. The slim body reaches into tight spots to grip and turn screws that are hard to reach or too small to hold by hand.