14 STANDARD TEK PRODUCT NAME A4 Grade Standard Tek TECHNICAL ✓ A4 grade Stainless Steel LIGHT SECTION Designed For: Fastening various components to light section materials where the highest standards of corrosion resistance are required. Head Style: Hex Head with washer Drive: 5/16” Hex Head Washer: 16mm Ø bonded EDPM A4 stainless (also offered without washer) Thread Form: Coarse Thread ( Tek 3 ) Shank material: Stainless Steel Material Grade: 316 / Euro A4 Evolution A4 Bi-Metal tek screws are designed for use in coastal and chlorinated atmospheres. Also where heavy industrial pollutants are present. HEAVY SECTION Designed For: Fastening various components to heavy section materials where the highest standards of corrosion resistance are required. Head Style: Hex Head with washer Drive: 5/16” Hex Head Washer: 16mm Ø bonded EDPM A4 stainless Thread Form: Coarse Thread ( Tek 3 ) Shank material: Stainless Steel Material Grade: 316 / Euro A4 COMPOSITE PANEL Designed For: Fastening cladding panels and brick tie channel to light section materials where the highest standard of corrosion resistance is required. Head Style: Hex Head with washer Drive: 5/16” Hex Head Washer: 16mm Ø bonded EDPM A4 stainless or 19mm Ø bonded EDPM A4 stainless Thread Form: Coarse Thread ( Tek 3 ) Shank material: Stainless Steel Material Grade: 316 / Euro A4 2002/95/EC