Robertson's design consists of a tapered square-tipped screwdriver that fits into a matching square recess (the “socket”) in the screw head. This design makes a Robertson screwdriver
less susceptible to cam-out than a Phillips driver
because the driver bit inserts deeper into the screw head.
What is a Robertson screwdriver 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 the difference between a Robertson and a Phillips screwdriver?
Robertson's design consists of a tapered square-tipped screwdriver that fits into a matching square recess (the “socket”) in the screw head. This design makes a Robertson screwdriver
less susceptible to cam-out than a Phillips driver
because the driver bit inserts deeper into the screw head.
Why are there no Robertson screws in America?
Most historians attribute its lack of popularity in the United States to Henry Ford. Having been nearly bankrupted by shady European licensees, Robertson
refused to license his invention to Ford
. Without a guaranteed supply, Ford turned to the Phillips-head screw, cementing its reign in American industry.
Why is a Robertson screw better?
A thing of beauty for Canadian woodworkers because that
recessed square won't let you slip out
. The screwdriver fits so snugly, you can torque this baby upside-down with one hand. It's the best screw around, and most Americans have never heard of it.
Is Torx better than Philips?
By design, Torx head
screws resist cam-out better than Phillips head or slot head screws
. Whereas the tendency of Phillips drivers to cam out under excessive torque has been listed as a feature preventing damage to the screw-head or driver, Torx heads were designed to prevent cam-out.
Why is it called a Robertson screwdriver?
Peter frequently told the story- now a legend – about the accident in downtown Montréal. He was demonstrating a spring-loaded screwdriver when
the blade slipped from the screw-slot and badly cut his hand
. The incident inspired him, so he decided to invent an improved and safer screw – The Robertson® Drive.
Is Robertson the same as square drive?
Although the terms “square drive” and
“Robertson” are often treated as the same in catalogs
, the difference (as I understand it) is that Robertson tools and screws have a slight taper to the square recess and the square drive ones do not. Most online sources claim that the tapered design is superior.
What are the 4 different types of screw heads?
- 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 the difference between a 1 and a 2 Phillips screwdriver?
Phillips head screwdrivers are built to work with the same screws, only those with crossheads instead. … The #0 Phillips head drivers fits screw numbers 0 and 1 while the
#1 Phillips head fits screw numbers 2, 3, and 4
. #2 Phillips head screwdrivers fit screw numbers 5, 6, 7, 8, and 9.
How do you unscrew a Torx screw without Torx?
If you don't have a Torx screwdriver, you can attempt to unscrew the screw with
a flat head screwdriver
. Simply insert the flat head screwdriver into two opposite edges of the Torx screw head. Then, turn counterclockwise slowly to remove.
Why do we still use Phillips screws?
Philips head are
specifically designed so you can't over torque them
, that's why. The screwdriver slipping out is the design working properly. Exactly. We use Phillips specifically so that the screw can't be over-torqued.
Why do Torx screws exist?
The Torx design was introduced in the 1960s as a replacement to Phillips or slot style screws/driver combinations. Where the Phillips/Slot style screws were designed to prevent over tightening allowing the tool to slip beyond a specific torque, the Torx was designed
to prevent slipping and reduce damage to the tool
.
Why are there still flat head screws?
Because some manufacturers have not yet experienced the perfection that is the Robertson head screw… Flat head screws are
good for wood as they prevent overtightening and thus help prevent stripping
.
Why are there Square head screws?
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 does GRK screws stand for?
oK – stupid question – whats GRK stand for?
Green River Killer
. BUIC Sep 01, 2007 02:55pm #16. GRK is a brand of high quality screws.
