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Metal Fabricating Glossary
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hardness
noun
Definition
Resistance to indentation, scratching, abrasion, or cutting. Materials with little resistance are called soft; those with high resistance are called hard. Hardness in steel is measured by scientific instruments.
References on theFabricator.com
Metalworking fluids designed for heavy machining
Self-clinching, flush-head studs made for thin stainless steel assemblies
External Sources
Wikipedia: hardness