DGS Screws
DGS stock screws in Marutex Magnum stainless steel, austenitic stainless steel and carbon steel with a choice of corossion protection coatings.
Declaration of Conformity to BS7412:2007
The standard BS7412:2007 covers the material requirements for fasteners used in the window and door industry.
The standard refers to the performance of fastenings to the BPF (British Plastics Federation) WG (Window Group) publication 363/1. Specifically 363/1 requires fasteners securing non-stainless steel hardware to have a corrosion resistance in excess of 240 hours in a neutral salt spray test (SST), tested in accordance to BS7479:1991. Fasteners securing stainless steel hardware must achieve in excess of 500 hours. Testing is to be carried out by an accredited independent UKAS laboratory.
With reference to stainless steel hardware, DGS (as well as the BFP) do not recommend the use of carbon steel screws in such applications as friction stays, because of the increased risk of corrosion due to an electrolytic reaction between two dissimilar metals and the potential exposure to aggressive environments such as coastal areas, which can accelerate the onset of corrosion. Window hardware attached using stainless steel fasteners supplied by DGS should help to ensure the long service life of the finished window or door.
All DGS Carbon Steel and Stainless Steel Screws conform to the guidelines set out in BPF WG3621/1 and in turn BS7412:2007. Independent test results are available on request.
We strongly recommend that if you are fixing stainless steel hardware, such as friction stays, you use either Marutex®.
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