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The Strong-Drive SDHR Combo-Head screw is a structural fastener designed for cross-laminated timber construction, mass timber construction and general interior applications. These partially-threaded, sturdy 0.394-in. and 0.472-in. diameter structural fasteners are designed to pull structural members together while providing excellent connection strength. The unique “combination” head allows for effortless driving using either a hex driver bit or T40 6-lobe driver bit. The SDHR Combo-Head has an interior-grade, blue-zinc coating, a robust knurled shaft and Type-17 point for fast starts and low-torque driving.
Designed for use with steel side plates
Can be driven by either a hex-head or 6-lobe driver bit
Heavy-duty, partially-threaded shaft with knurl provides strength, with superb pull-out resistance
Type-17 point ensures fast starts, reduces installation torque and eliminates the need for predrilling in most applications
Deep T40, 6-lobe recess for a secure drive (replacement bit BIT40T-134-R2)
