The actual thickness associated with a "gauge range" varies largely by industry. Gauges are OK for ball-parking, but are not adequate for engineering purposes. Producing mills and reputable service centers work from actual measurements or minimum thicknesses.
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The strength, durability, and longevity of steel caskets depends first of all on the quality and thickness of the metal sheets used. The United States Standard Gauge for the thickness of metal sheets is based on the number of sheets required to total one inch. The gauge number (ga) informs about the thickness of the steel sheets in such a way that the lower the gauge number, the thicker the steel. Low cost carbon steel caskets are usually made of 20-gauge steel. (20 sheets of 20ga steel have a thickness of one inch.) Twenty gauge steel sheets have a thickness of 1/20" or 0,8 mm; this is the same thickness as used in many automobile body panels. More expensive steel Caskets are made from 18- and 16-gauge steel. 16 ga steel sheets have a thickness of 1/16" or 1,3 mm. 16 ga steel is twice as heavy as 20 ga steel, 140% stronger and has a 140% longer life than 20ga.
If it is steel, the thickness is 0.0359 ins (35.9 thou), or 0.9119 mm. See Wikipedia 'Sheet Metal Gauge' for a full table of thicknesses
The thickness of the steel used in a Snap-on toolbox can vary depending on the specific model and design. Generally, Snap-on toolboxes are constructed using high-quality steel ranging from 16 to 20 gauge thickness. Thicker gauges, such as 16 gauge, offer more durability and strength compared to thinner gauges like 20 gauge. It is recommended to refer to the manufacturer's specifications for the exact thickness of the steel used in a particular Snap-on toolbox model.
When referring to steel, the higher the gauge a steel is the thinner it will be. So 20 gauge steel is thinner than 18 gauge steel, which would suggest 18 gauge shelving is heavier than 20 gauge.The maximum gauge is 30.
19 gauge steel is 1.11 mm thick and 20 gauge is .953 mm thick.