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www.sizes.com/tools/thread_american.htm

American inch-based screw thread series, used in bolts, machine screws, threaded holes in castings, and so forth. Threads per inch, diameters of clearance holes, size of tap drills, and size of nuts.

www.fastenersuperstore.com/fastener-guides/measuring-screws-bolts

Length of Screws / Bolts. The simplest way to remember how to measure length: Length is the distance from the flat part of the head, to the tip or blunt end of the screw or bolt. Almost all screw head types will either be flat on the top or on the bottom.

www.screwsline.co.uk/gauges_and_sizes

The gauge of a screw is defined by the thickness (diameter) of the un-threaded part of the screw known as the shank. Ordinarily, in the United Kingdom the head size is roughly twice the diameter of the shank, although there are some exceptions associated with hybrid, hardened, DIN Standard (metric) and imported screws.

www.screwshop.co.uk/.../2015/01/CLICK-HERE-for-Woodscrew-size-conversion-chart.pdf

Woodscrew conversion chart Flat (Csk) head screws are measured in total length, Round/Pan head screws are measured from underneath the head, ie. The part that is inserted into the wood. Also below is a guide to which Pozi Bit could be used, PZ2 most popular Gauge (mm) Length (mm) Imperial Size Gauge (mm) Length (mm) Imperial Size 12 4 x 1/2 25 ...

www.doityourself.com/stry/h2selectscrews

The oval-head screw extends above the surface in a slight oval, the round-head screw protrudes above the surface in a half-circle, and the flat-head screw is flush with the surface. Use this screw selection chart for selecting the correct size and length of screw for any job. This chart is designed for flat-head screws but can be used for any type.

freeautomechanic.com/bolt-chart.html

This general reference guide will help you identify Metric Nuts. Metric Nuts. Lay-over charts for quickly identifying diameter, thread count and other US fastener dimensions. US Hex Bolts. A printable paper version of our popular Thread Gauges.

www.ehow.com/how_6928381_size-machine-screws.html

Hold the screw in one hand while trying the edge of your thread gauge against the screw with your other hand. Again, these tolerances will be close, especially on smaller screws. Hold the gauge and screw up to the light. The gauge leaf that fits will allow no light between the screw's threads and the serrated edge of the gauge.

www.engineeringexpress.com/wiki/tekscrews

Four different point styles—#2, #3, #4 and #5—are available. Generally speaking, a #2 point is used with light gauge materials, #3 for medium gauge, and #4 and #5 points with heavy gauge materials. Type U metallic drive screws have spaced spiral threads and a blunt point. These screws are forced under pressure into the material.

www.bobvila.com/articles/how-to-choose-the-right-screw

The other factor is the screw’s diameter, or gauge. Screws come in gauges 2 through 16. Most of the time you’ll want to go with a #8 screw. If working with very thick or heavy material, go for ...

removeandreplace.com/2013/12/20/cheat-guide-chart-for-fasteners-bolts-screws...

Working on a project and trying to find the name of a special bolt type? We have the charts to help you identify the many different types of bolts and screws for just about any project. Using the proper specific bolt type is very critical when working on a wood or metal project. Knowing the … Cheat Guide Chart – Bolts, Screws, Washers, Nuts, Drive Charts Read More »