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Fasteners for a lasting, firm hold

Know your threads

Know your threads

Thread shape: Threads are changing rapidly. A composite screw's shank usually has opposing threads designed to keep the lower threads from spinning out in less-dense natural material (i.e., a wood floor joist). Spax, a composite screw, even has serrated threads (shown) to improve cutting ability and reduce torque.

Continued on page 9:  Salt spray and splitless



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