Simpson 0.390 x 4" Strong-Drive SDHR COMBO-HEAD Screw Blue Zinc Grind / Sand / Polish and trim exposed to moisture

and trim exposed to moisture and weather

(2) backplates - two backplates make up one complete connection

preserving the material's integrity even in aggressive environments

This makes the HSURC410Z well suited for architecturally finished spaces where the appearance of the framing connection is important

A dedicated 3-phase electrical supply is required for installation

Simpson 0.390 x 4" Strong-Drive SDHR COMBO-HEAD Screw Blue Zinc Grind / Sand / Polish and trim exposed to moistureThe Simpson Strong Drive SDHR Combo Head Screw is a heavy duty structural fastener engineered for cross laminated timber construction, mass timber assemblies, and general interior applications. Built with a partially threaded shank and a robust 0. 390 in. outer diameter, this blue zinc coated screw is purpose built to draw structural members tightly together while delivering exceptional connection strength in engineered wood and modular construction