Lists special installation methods required for the fastener. This includes instructions for dimpling (e.g., "D2" for dimpling both sheets) or countersinking (e.g., "C").
(typically in 1/32nds of an inch) and often the material or head style code. Lower Left (Southwest): Indicates the installation requirements
Lists special installation methods required for the fastener. This includes instructions for dimpling (e.g., "D2" for dimpling both sheets) or countersinking (e.g., "C").
(typically in 1/32nds of an inch) and often the material or head style code. Lower Left (Southwest): Indicates the installation requirements
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