6.3 x 225mm A4 Stainless Steel Concrete Screws (Bi-Metal) Hex Head - Box of 50

6.3 x 225mm A4 Stainless Steel Bi-Metal Masonry Screws - Box of 50 Fixabolt SKU: MS-HH-A4-6-3-225 Size: 6.3 x 225mm Box Quantity: 50 screws Material / Finish: A4 Stainless Steel Bi-Metal with zinc plated drill point Material Grade: AISI 316 / A4 stainless steel Head Style: 5/16" hexagonal head Drive: Hex head Drill Point: Type 17 Recommended Pilot Hole Diameter: 5.15mm Embedment Guidance: 25.0mm minimum embedment depth This box contains 50 A4 stainless steel bi-metal masonry screws in 6.3 x 225mm size for fixing timber battens, trunking, track and general components into concrete, masonry and timber. The A4 stainless steel body gives this range exceptional corrosion resistance for external and exposed applications, while the hardened carbon steel point and lead thread help the screw tap consistently into masonry substrates during installation. The aggressive threadform is designed to provide strong holding power without expansion pressure, making these screws useful where fixings need to be positioned closer to the edge of the substrate than traditional expansion anchors would allow. See our range of stainless steel concrete screws.