Fasteners at the gutter edge of a metal panel roof.

Fasteners with fastener plates securing polyiso insulation.

Useful Links:

1. TechnicalAmerican National Standard - Standard Field Test Procedure for Determining the Withdrawal Resistance of Roofing Fasteners is made available on the TRUFAST website.

2. TechnicalGuide for Materials Selection and Design for Metals Used in Contact with Copper-Treated Wood - the title is self-explanatory, the article is from 2013, and is made available by the US Department of Agriculture's Forest Service's Forest Products Laboratory

3. See here for a list of roofing fastener manufacturers.