Strong-Drive® SDHR COMBO-HEAD Screw

Product Details

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"- and 0.472"-diameter structural fasteners are designed to pull structural members together while providing excellent connection strength — especially when connecting steel plate connectors to wood. 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.

Key Features

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)
Interior grade blue-zinc coating
Available in 4" and 6 1/4" lengths in two diameters: .394" and .472"

Applications

Wall-to-wall, floor-to-floor, support beams, lap joints, ledger connections, steel plate and angle connections

Related Literature

Connectors and Fasteners for Mass Timber Construction Catalog

C-C-MASSTIMBER20

A catalog featuring connectors and fasteners for mass timber construction solutions.

Catalog

Simpson Strong-Tie® Strong-Drive® SDHR Combo-Head Screw

L-F-SDHRSCREW20

Strong-Drive® SDHR Combo-Head screws are load rated for shear, pull-over and withdrawal resistance in sawn wood, glulam, CLT and structural composite lumber products.

Engineering Letter

Product Information Table

Fastener Production Information and Stuff & Things

New products
Model No.	Coating/Material	Length (in.)	Head Diameter (in.)	Shank Diameter (in.)	Drive Type	Head Type	Thread Length	Point Type	Packaging Qty.	UPC
SDHR27400	Blue-Zinc Coated	4	0.590	0.275	T40 6-Lobe or Hex-Head	Combination	2.15	Type-17 Point	100	707392012054
SDHR27400-R25	Blue-Zinc Coated	4	0.590	0.275	T40 6-Lobe or Hex-Head	Combination	2.15	Type-17 Point	25	707392012146
SDHR27614	Blue-Zinc Coated	6 1/4	0.590	0.275	T40 6-Lobe or Hex-Head	Combination	4.30	Type-17 Point	100	707392012061
SDHR27614-R25	Blue-Zinc Coated	6 1/4	0.590	0.275	T40 6-Lobe or Hex-Head	Combination	4.30	Type-17 Point	25	707392012153
SDHR31400	Blue-Zinc Coated	4	0.669	0.315	T40 6-Lobe or Hex-Head	Combination	2.15	Type-17 Point	100	707392012078
SDHR31400-R25	Blue-Zinc Coated	4	0.669	0.315	T40 6-Lobe or Hex-Head	Combination	2.15	Type-17 Point	25	707392012160
SDHR31614	Blue-Zinc Coated	6 1/4	0.669	0.315	T40 6-Lobe or Hex-Head	Combination	4.30	Type-17 Point	100	707392012085
SDHR31614-R25	Blue-Zinc Coated	6 1/4	0.669	0.315	T40 6-Lobe or Hex-Head	Combination	4.30	Type-17 Point	25	707392012177