AC491 Self-drilling Tapping Screws Used with Aluminum—Approved June 2017, editorially revised January 2019 (PDF Download)

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AC491 1-2019
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AC491 establishes guidelines for evaluation of carbon steel, dual-hardened, stainless steel and bi-metal self-drilling tapping screws used used in engineered aluminum-to-aluminum, aluminum-to-steel and steel -to-aluminum connections.

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