5 Things to Know Before Buying cold rolled round bar

May. 05, 2025

Buying Better: The Definitive Cold Rolled Steel Gauge Chart

Cold-formed steel was first used in framing and construction around the s, both domestically in the United States and abroad in Great Britain. One of the first documented uses of cold-formed steel was the Virginia Baptist Hospital in Lynchburg, Virginia that was built around .

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Due to lack of design standards and little to no information on the product, acceptance of the material was limited until the ’s when Lustron Homes built and sold almost 2,500 steel-frames homes, with the framing, finishes, cabinets and furniture made from cold-formed steel.

Cold-formed steel framed construction and homes are known for their longevity, strength, and resistance to harsh elements. This makes them ideal for even the most extreme environments and a notable sign of quality construction.

The first and most important rule of reading and understanding a steel gauge chart is using the right one. Meaning coated steel gauges like galvanized are vastly different from uncoated steel like hot rolled and cold rolled gauges.

Standard gauge numbers and sizes were developed based on the weight of the sheet for a given material and coating. The equivalent thicknesses differ for each gauge number. You must use the specific gauge chart for each material to learn the right thickness.

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So, in this case, you’ll need the Cold Rolled Gauge Chart.

Now that you have the right chart, it’s time to understand how it’s measured. Gauges are different from other measurement units such as inches or centimeters. That’s due to there being no universal thickness measurement for metal during the 19th century.

The British iron wire industry adopted metal gauges over other traditional units like inches as the primary unit of measurement, and thus it’s become the standard for the steel industry, being used across sheet metals.

When looking at a gauge chart, the key to understanding it, including our cold rolled chart, is to look at the number. Gauges range from 3-31, each has a specific thickness assigned to it for the material based upon its weight.

The general rule across all gauge charts is the larger the number, the thinner the steel. The inverse is also true, as the gauge number gets lower, the thicker the steel gets. But, those numbers do not give you specific dimensional values. Follow the chart for the exact numbers you need.

If you’re looking for an even simpler solution to understanding the correct gauge, weight, width, and measurement conversions of any steel product, use our steel calculator Unravel.

Whether calculating gauges for cold rolled, hot rolled, and coated materials, looking for sheet metal or coil measurements, or just looking for unit conversion to inches and pounds, Unravel does the work for you.

Contact us to discuss your requirements of a706 rebar. Our experienced sales team can help you identify the options that best suit your needs.

Cold rolled steel? | The Hobby-Machinist

Unfortunately as hobbyists we have to get what's available for a decent price.It would be nice to use , 12l14, but there are limits on cost, etc. I try to learn how to work with the material I can get, and this forum is useful for those ideas.

I understand this.
However many hobbyists are more concerned about appearance then function, hence the many "Can't get a good surface finish in steel" questions posted.

If I were making a hobby part and the most important consideration is surface finish I would happily pay more for a material that finishes nicely with the tooling and machines that I have to use.

Does this not make sense? On the face of it, it does make sense, but availability is a big issue with most folks, it seems; surely we could all order from a convenient online source, such as Mc Master Carr, but it gets pretty expensive. I am personally fortunate to have cleaned out all the remnants of stock when I sold my business and taken them home, my very own little scrap yard, and can still go back to my old shop and beg material when needed, in exchange for such as cutter sharpening, etc.
Most hobbyists are not so fortunate, and must, by necessity use what comes to hand; by experience, they will learn to deal with less than ideal materials, and learn which cutting tools and lubricants lead to an acceptable finish, and also, they need to learn the use of files and abrasive cloth; cutting tools are not the panacea when it comes to finish.
Another thing that I have harped on several times previously is the choice of carbide inserts that hobbyists seem to gravitate to for reasons of economy, handiness, and utility; I am speaking of the parallelogram shaped (negative rake) inserts, they do not lend themselves to nice finishes to say the least, fine for roughing on a machine with sufficient power to effectively use them, machines, for the most part the hobbyist does not possess. A free cutting (positive rake) insert goes a long way to solving finish quality problems. I use nearly all TPG (positive rake) 300 and 400 series inserts for my lathe work except for work done on my 9" Monarch, where I use all HSS tools.

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