What are 4 different sizes of Robertson screwdrivers?
The green #1 drive bits are 1”, 2” or 4” long and fit screw sizes #5, #6 and #7. The red #2 drive bits are 1”, 2”, 4” or 6” long and fit screw sizes #8, #9 and #10. The black #3 driver bits are 1”, 2”, 4” or 6” long and fit screw sizes #12 and #14.
How many sizes of Robertson bits are there?
Currently, there are five different Robertson screwdriver types available, with suitable screw size indicated by the color. Orange drivers (#00) are appropriate for use with screw types 1 and 2. The recess size range (the size of the corresponding square imprint on the screw) is from 1.77-1.80 mm.
What is the most common Robertson screwdriver size?
Screwdriver Type: Robertson Today, the Robertson screw, which ranges in recess size from 1/16” to 3/16”, is extensively used in construction and remodeling projects.
What size are screwdriver bits?
They come in three main sizes – 1/4”, 5/16”, and 3/8”. Sometimes these sizes will be slightly small for the screw at hand.
How do I know what size screwdriver I need?
If you have the package in which your screws came in, look at the package for the size of screws you bought. You want to look at how long and thick the screw head slot is. You can then find a screwdriver that’s the same size.
Why is it called a Robertson screwdriver?
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. P.L Robertson always looked for a better way of doing things and enjoyed working on new innovations.
How do you know what type of screwdriver tip to use?
Screwdriver Technique The most important technique is to use the right size screwdriver. While screw size is shrouded in mystery, there are four basic sizes of Phillips screwdriver — from #0 to #4 — #0 being the smallest. The most common sizes are #2 and #1, #2 for standard screw sizes, #1 for “miniature”.
What is the difference between a Robertson and a Phillips screwdriver?
Phillips heads have a cross-shaped tool indent. Square indentations are also known as Robertson screw heads and require a special driving tool. A torx head has a six-pointed star tool shape, which requires a torx screwdriver.
What is a Robertson screw?
A Robertson screw, also known as a square screw or Scrulox, is a type of screw which 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. The Robertson screw is specified as ANSI Type III Square Center.
Are PH2 and PZ2 the same?
2 hours remaining. PH is short for Philips head, whereas PZ is short for pozidrive. PH screws just have a cross slot on the head; PZ look similar but have additional lines between the slots.
What is a PZ2 screw?
PZ2 Screwdriver bits have a cross shaped centre and then a second set of indentations set at 45 degrees and can be used to drive pozidriv screws into wood, metal, plastic and drywall materials. It’s important to select the correct shaped bit for the screw head to ensure maximum torque is applied.
What is a Robertson screwdriver used for?
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. [citation needed]
What is a Robertson screw or Robertson head screw?
Robertson Screw. The Robertson socket head screw soared in popularity. Craftsmen favored it because it was self-centering and could be driven with one hand. Industry came to rely on it for the way it reduced product damage and sped up production.
What is the size of a screwdriver?
While the most common size is about 4 inches long, making the overall screwdriver length 8 to 9 inches long, a longer screwdriver is often easier to use and prevents you from having to bend over as much, while you do the work. The most common shape for a flat head screwdriver is a “keystone” shape.
What is a Robertson tip screwdriver?
Robertson screwdriver(Noun) A type of screwdriver having a square tip, designed to drive a Robertson screw. Origin: From Canadian inventor P. L. Robertson (1879-1951).