This level of accuracy would generally be unachievable by the metal producer. Without a specified tolerance, this could mean the purchaser wants a metal sheet that is 48.00000000 inches by 96.00000000 inches. For instance, a purchaser may want a metal sheet that is 48 inches long by 96 inches wide. While these variations are typically small, they must be considered.Ī tolerance can be beneficial to both the producer and the purchaser. These include changing tool and die dimensions, chemistry variation, furnace temperature fluctuation, and different cooling rates, to name only a handful. Tolerances are needed because metal forming processes have unpreventable sources of variation. A tolerance or set of tolerances is made to give the manufacturer of a metal product some measurement allowance in the production process. What is a Tolerance and Why Use Them?Ī tolerance is a range of acceptable measurements outside of the nominal dimension. However, there are variations that are inherent to the metal forming and sizing processes that require a measurement designation known as a tolerance. In an absolute, perfect world, the metal that was ordered would be delivered to the customer in exactly that size to the nth degree. The size specified is known as the desired nominal dimension. When ordering a metal, the customer typically asks for a specific shape and size.
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