SDS HEX SELF DRILLING ROOFING SCREWS.
Ads hex self drilling scews are available in different sizes at Fastlane Hardware and Tools Limited.
Description
They are one of the important fasteners for metal buildings, we usually use class 3 and / or class 4 hex head self drilling screw to fix metal roofing & cladding profiles to steel purins, the common Installation methods are Crest Fixing, Cladding Fixing/ Valley Fixing, Clip Fixing and Side Lap Fixing (Stitching).
Hex Self-Drilling Screws
A Self-Drilling Screw is a Self-Tapping Screw with the added feature of a drill point. The drill point looks a lot like the point of a drill. It will drill a hole and form the mating threads in one operation.
Hex Heads are available in different materials for use in a number of applications.
- Carbon Steel
- Stainless Steel AISI-304
- Stainless Steel AISI-316
Bi-Metal – SS-304 with Carbon Steel Drill point
Bi-Metal self-drilling tapping screws that provide the corrosion resistance of 300 series stainless steel and the efficiency of drill screws. Such screws avoid the shortcomings of each of these materials.
The whole screw is protected with a silver slide coat. This coating not only adds additional corrosion protection it also reduces the screw in resistance.
This screws can be used for up to two sheets of 1.00mm stainless steel (2.00mm total thickness). The hardened point cuts through the steel then the 304 screws are designed to last a long time without corrosion and can also be used with 316 sheet or cladding. This is a much better option than either a carbon steel screw or a 410 stainless screw that will be at risk of corrosion.
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