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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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Comments (1)
9458153063
imrobc wrote:

OK. Tried looking it up. What is ACQ? non frame, etc... Thx Rob C

2/10/2015 08:25:57 PM Report Abuse

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