ForgeFix General Purpose Twin Thread Screws 3 1/2" x 8 Zinc Plated Box 100

ManoMano

General Purpose Pozi Screw Countersunk TT ZP 3 1/2 x 8 Box 100 These Forgefix General Purpose Pozi Compatible Screws with Countersunk heads are zinc plated for increased durability. They are an extremely popular general purpose screw, and suitable for use in and with many materials. APPLICATION: Ideal for use in many ironmongery, electrical and plumbing applications. Can be used with various screw cover caps. Zinc coatings prevent oxidation of the protected metal to create a longer lasting finish. It does this by forming a barrier and by acting as a sacrificial anode if this barrier is damaged. Zinc oxide is a fine white dust that (in contrast to iron oxide) does not trigger a breakdown of the substrate’s surface integrity as it is formed. The zinc oxide, if left intact, can act as a barrier to further oxidation, in a way similar to the protection afforded to aluminium and stainless steels by their oxide layers. The Pozidriv screw is similar in appearance to the classic Phillips

Amazon

A twin thread screw ideal for a range of fixing applications Ideal for fixing into a range of substrates including softwoods, hardwoods, chipboards and fibreboards Extra deep insert bit recess allows a quicker and easier insertion, which enables a firmer positive drive Twin thread and special wax coating also increases speed and ease of insertion Twin thread provides increased holding power, Weight: 0.65 pounds, Manufacturer: Forgefix