| 摘要 |
A fastener unit for use in metal building construction in which a compressible sealing washer is used in combination with a threaded shank including a threaded portion of limited axial extent having a crest diameter substantially greater than the crest diameter of the remaining threads on the shank. The fastener unit is capable of being utilized to attach two relatively thin sheets of material while at the same time is configured in such a manner to be able to fasten a thin sheet of material to a structural member. The larger diameter threaded section pulls at least one sheet of material up towards the head of the fastener as the fastener is tightened and the sealing washer is compressed.
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