A hem is a flange that has been bent more than 180 degrees. The rope hem is used for attachment to other sheet metal parts. It is used for materials with insufficient ductility to form the open hem.
The Fabricator Blog
Metal fabrication is a communication business - by Tim Heston Most view metal fabrication as a technology business. But custom fabricators are complex, albeit usually small businesses. In such complex environments, good communication can make things a lot easier.
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