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Sheet Metal Gauge
A numeric designation for sheet metal thickness, where larger numbers represent thinner material. Common gauges in press brake work range from 7 gauge (0.179 inch) to 26 gauge (0.018 inch). Gauge-to-inch conversion varies by material.
Sheet metal gauge is a standardized numerical system where lower numbers indicate thicker material, 10 gauge mild steel is approximately 0.135 inches thick, while 20 gauge is only about 0.036 inches. This inverse relationship frequently causes confusion, but understanding gauge equivalents is essential for press brake setup because material thickness directly determines tonnage requirements, bend radius capabilities, and springback behavior.
Importantly, gauge thickness varies by material type, 18 gauge stainless steel (0.048 inches) is thinner than 18 gauge mild steel (0.048 inches) due to different gauge standards historically used for different metals. Fabricators must verify actual material thickness with calipers rather than relying solely on gauge designations, especially when tight tolerances are required on the finished part.
This verification step is particularly important when switching between material suppliers, as thickness can vary within the acceptable tolerance range of a given gauge designation.
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