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

Strong-Drive® SDHR COMBO-HEAD Screw

S-F-SDHR22

A flier providing product and installation information for the Strong-Drive® SDHR Combo-Head screw.

Flier

Connectors and Fasteners for Mass Timber Construction Catalog

C-C-MASSTIMBER20

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

Catalog

Installation Torque & Tools for SDCF TIMBER-CF, SDCP TIMBER-CP and SDHR COMBO-HEAD Screws

L-F-MTINSTALL22

The purpose of this letter is to convey recommendations for installation of Strong-Drive SDCF TIMBER-CF Screws, SDCP TIMBER-CP Screws and SDHR COMBO-HEAD Screws.

Engineering Letter

Strong-Drive® SDCF, SDCP, and SDHR screws in ICC-ES ESR-3046

L-F-SDCFCPHR21

Simpson Strong-Tie® Strong-Drive® SDCF Timber-CF screw, SDCP Timber-CP screw and SDHR Combo-Head screw are now listed in ICC-ES ESR-3046.

Engineering Letter

Simpson Strong-Tie® Strong-Drive® SDHR COMBO-HEAD Screws

L-F-SDHRCAN22

This letter provides design information for Simpson Strong-Tie Strong-Drive SDHR COMBO-HEAD screws used in steel-to-wood connections in accordance with CSA Standard O86-14 and NBC 2015.

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.
SDHR27400	Blue-Zinc Coated	4	0.590	0.275	T40 6-Lobe or Hex-Head	Combination	2.15	Type-17 Point	100
SDHR27400-R25	Blue-Zinc Coated	4	0.590	0.275	T40 6-Lobe or Hex-Head	Combination	2.15	Type-17 Point	25
SDHR27614	Blue-Zinc Coated	6 1/4	0.590	0.275	T40 6-Lobe or Hex-Head	Combination	4.30	Type-17 Point	100
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
SDHR31400	Blue-Zinc Coated	4	0.669	0.315	T40 6-Lobe or Hex-Head	Combination	2.15	Type-17 Point	100
SDHR31400-R25	Blue-Zinc Coated	4	0.669	0.315	T40 6-Lobe or Hex-Head	Combination	2.15	Type-17 Point	25
SDHR31614	Blue-Zinc Coated	6 1/4	0.669	0.315	T40 6-Lobe or Hex-Head	Combination	4.30	Type-17 Point	100
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