Forgefix Corrugated Roofing Screw Round Head Pozi Zp 2in X 10in Bag 10 10crsc
These Forgefix Pozidriv, round head Corrugated Roofing Screwsare Zinc Plated for increased corrosion resistance. They comecomplete with a specially designed plastic fold over cap to suitinstallation of corrugated roofing. The plastic cap has a largesurface area to improve weather resistance.
Screw size: 4.0 x50mm (Pozi).
Suitable for fixing corrugated sheeting to timber sub frames.
Zinc coatings prevent oxidation of the protected metal to createa longer lasting finish. It does this by forming a barrier and byacting as a sacrificial anode if this barrier is damaged. Zincoxide is a fine white dust that (in contrast to iron oxide) doesnot trigger a breakdown of the substrate’s surface integrityas it is formed. The zinc oxide, if left intact, can act as abarrier to further oxidation, in a way similar to the protectionafforded to aluminum and stainless steels by their oxidelayers.
The Pozidriv screw is similar in appearance to the classicPhillips cross-head, but in fact is very different. The Pozidrivhas four additional points of contact, and does not have therounded corners that the Phillips screw drive has. The biggestadvantage it offers is that, when used with the correct tooling ingood condition, it does not cam out, allowing great torque to beapplied. The Pozidriv screw can easily be distinguished by a lineembossed in the screw head at 450 to the slots for the driver.
Round heads have a flat under head surface making the screwideal for laying flat on sheet material of all types, reducingdeformation.
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