Robertson or Square Screwdriver
Share: The Roberston 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.
Subsequently, question is, what tool has a square head? Shop for Protractor Sets The square head is arguably the most commonly seen part of the combination square set. It is traditionally used for determining whether angles are at right angles or 45 degree angles (such as a 45 degree mitre in a mitre joint).
Correspondingly, what are the different screwdriver heads?
Screws, and screwdrivers, have different types and sizes. The most common types here in the US are Phillips head and slot head. Then there’s the less common Torx or star head, a super cool six-pointed star-shaped head, which is used on things that need to get very tight. Others exist, but let’s not get too complicated.
Why is it called a flat head screwdriver?
The tool used to drive a slotted screw head is called a standard, common blade, flat-blade, slot-head, straight, flat, flat-tip, or “flat–head” screwdriver. This last usage can be confusing, because the term flat–head also describes a screw with a flat top, designed to install in a countersunk hole.
What are the five most common screwdriver types?
A range of precision screwdrivers always includes the most commonly used types and sizes: slotted, Phillips, Torx, Hex.
How do you get a screw out of a square head?
Any method you choose to try to remove a square head screw without a square head driver would be much, much more trouble than any cost it saves is worth. Screwdrivers are inexpensive. These screws are usually tightened or removed with a hand held power drill/screwdriver with the appropriate bit.
What is a square head screw?
A Robertson, also known as a square or Scrulox screw drive is specified as ANSI Type III Square Center and has a square-shaped socket in the screw head and a square protrusion on the tool. Both the tool and the socket have a slight taper.
What are JIS screws?
Commonly found in Japanese equipment, JIS looks much like a Phillips screw (and even more similar to Frearson), but is designed not to cam out and will, therefore, be damaged by a Phillips screwdriver if it is too tight. Heads are usually identifiable by a single raised dot to one side of the cross slot.
What is the difference between Torx and Torx Plus?
The Torx Autosert feature guides the driver bit accurately into the recess creating a self-centering engagement action. Torx Plus is designed for high torque transmission. This means that higher torques can be used to securely tighten fasteners without incurring additional wear and tear on the tools.
Are triple square and Torx the same?
A triple square is just that, 3 squares overlaid, each point is 90*. A Torx has a completely different profile. Any good set of triple square sockets (bits) will have the sizes that you need for VW work. Here is a good pdf on measuring the bolt head although if you have a set just use what fits.
What is a PZ bit?
A Pozidriv has ribs between each of the four arms of the cross. A Pozidriv bit does not fit in a Phillips screw head. Pozidriv bits are available in driver sizes from 0 to 5 (from smallest to largest) and have “pz” marked on them.
How do I choose a screwdriver bit?
By selecting the right match and fit you will prevent stripped screws, damaged bits, and spoiled work surfaces. Choose the bit size that fills the screw head entirely. A bit that is too big or too small will not seat properly, and you’ll end up with a stripped screw.
What are the different Torx sizes?
Common sizes include T10, T15, and T25, while T5. 5, T35, and T47 tend to see specialized use.
What is an easy out tool?
A screw extractor is a tool for removing broken or seized screws. There are two types: one has a spiral flute structure, commonly called an easy out after the trademarked name EZ-Out; the other has a straight flute structure. One way to avoid this added difficulty is to drill a hole completely through the screw.
What is the best screw head type?
Phillips: What is the best type of screw head? Many would say the Phillips head screw, which is commonly used and a lot more stable than a slotted screw.