We have started with Head Types for you, and narrowing your search from here is easy... Read More
How to Use Select-A-Screw
Select-A-Screw searches through the thousands of screws that McFeely's offers. Narrowing your search is easy. Begin "Select-A-Screw" by telling us three things:
The Head Type – knowing your head type for the application narrows the list further
If you are looking for screws with "Nibs", Select "Bugle and Flat Head" Category.
Then Choose "Flat" Head from the filter on the left. With or Without Nibs will show as an additional option.
The Screw Material – we recommend that you start here. If you know the application and the material of the screw, it will narrow down the selection quickly.
The Screw Length – next, if you know your length, (remember that you want 2/3rds of your screw to go into the attaching material.)
In most cases, after making these three selections, Select-A-Screw will have narrowed your search to just a few screws. If you want to use additional attributes selected, Select-A-Screw goes to work.
Traditional Wood Screw vs. Modern Production Screw
The difference between a traditional wood screw and a modern production screw is found in the sizing differences between the diameter of the screw shank and the screw threads.
Traditional Wood Screws - The shank diameter on this screw exactly matches the outside dimensions of the threads. Threads on these screws are deeper near the point and begin to shallow as they get closer to the unthreaded shank or screw head. Tapered drill bits are needed with this type of screw as the pilot hole should fit the outside shank diameter of the screw almost perfectly. Creating this tight fit on traditional wood screws yields maximum holding power.
Modern Production Screws - The shank diameter is smaller than the major diameter but larger than the minor diameter. The reduced shank diameter results in a deep thread profile offering great holding power. Drilling a pilot with a straight drill bit yields excellent results because the shank of the screw is straight throughout its entire length. The advantages of this are that straight bits do not require the same critical depth control as a tapered bit.
Minor Diameter: Measurement of the body of the screw between the threads (one side to the other) – Smaller than major diameter and shank diameter
Major Diameter: Measurement of the outside of the thread (one side to the other) – Larger than shank diameter and minor diameter
Shank Diameter: Measurement of the bare shank (one side to the other) – Larger than minor diameter but smaller than the major diameter
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