Zinc Plated Self Tapping Screws
We have a wide range of Zinc plated also described as Galvanised self tapping screws sizes available from stock pan head, hex head or Hex head with flange available with pozi or slot or square bit.
The ideal option to secure metal jacketing or cladding over insulation especially for tanks, vessels and pipelines. Designed to be long lasting and a low cost option.
Supplied from stock from 3.9mm up to 6.3mm diameter in lengths from 9.5mm up to 25mm
**Also available with Silver GL slide coat the slide coating provides optimum sealing with multifunctional properties, which guarantee excellent corrosion protection and simultaneously reduce the screw-in resistance. It is free from heavy metals that are harmful to health such as Cr-(VI) and is compliant with the EU directives concerning end-of-life vehicles (2000/53/EC) and electronic waste (2002/95/EC).
We can also supply with EPDM, Polymide washers to suit. Bonded washer are zinc plated and EPDM joined together to give a superior seal to prevent moisture ingress. These are supplied assembled to the screw.
EPDM washers are elastomers (long chain polymers that can be vulcanized) The vulcanization process is responsible for the elastic properties of all the materials we commonly call rubber. EPDM offer good resilience, tear strength and has good ability to resist damage from ozone, UV rays and are reasonably resistant to abrasion. They can withstand temperatures up to a high of 300 degrees F for EPDM , and a low of -60 respectively. EPDM has a good resistance to water swell.
All our screws are subjected to extensive quality control procedures. In this way we ensure the high quality standards demanded of our products. • Dimensional check • Screw-in test • Tensile strength and shearing resistance test • Extraction resistance and pull-through test • Torsional strength test • Hardness and coating thickness test • Torque test • Kesternich test IS2 in accordance with ISO 3231 (accelerated corrosion resistance test) • Cross-cut test (ISO 2409:2007) .
Zinc plating (Chrome VI free) By zinc plating the steel is coated with a thin layer of zinc (standard for mounting components 4 – 6 μ) in order to protect it from corrosion. When it has been freshly applied, the zinc layer has a bright sheen and then develops a metallic crystalline appearance for some time. In the course of time it becomes dark grey as a consequence of the corrosion of the zinc, which forms a weatherproof protective layer of zinc oxides and zinc carbonate when exposed to air. If the exposure to air and hence the inlet of carbon dioxide is restricted, undesirable white corrosion will occur.2 in accordance with ISO 3231 (accelerated corrosion resistance test) • Cross-cut test (ISO 2409:2007)