Name: Simpson Strong-Tie Strong-Drive SDWH Timber-Hex 3/8-in x 6-in Hot-dipped galvanized Exterior Structural wood screws ( 30 -Per Box )
Brand: Simpson Strong-Tie
SKU: 1002702998
Price: 64.98 USD
Rating: 4.8 (86 reviews)

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The Strong-Drive SDWH Timber-Hex HDG screw is a hot-dip galvanized fastener suitable for heavy-duty marine and coastal applications. It's ideal for use in structural pilings, piers, docks, boardwalks and offers the lowest installed cost for comparable pile solutions on the market. No longer do you need to purchase expensive auger drill bits, separate washers, nuts or bolts. Installation time is faster because you install only from one side and no predrilling is required.

Features a SawTooth point design, which provides fast starts and no predrilling or separate washer needed
Burly 0.276-in shank diameter ideally suited for heavy-duty structural applications
3/8-in hex drive for secure driving (replacement driver bit - BITHEXR38-134)
Oversized 0.93-in integral washer eliminates the need for a separate washer
Length: 6-in
ASTM A153 Class-C hot-dip galvanized coating suitable for coastal and marine environments
Quantity: 30
For best results, use a minimum of 1/2-in low-speed corded drill to install

General
Collection Name	Timber-Hex	Use Location	Exterior
Finish	Hot-dipped galvanized	Number of Pieces	30
Manufacturer Color/Finish	Hot-Dip Galvanized, Class C	Head Type	Hex washer
Series Name	Strong-Drive SDWH	Measure Type	Standard (SAE)
Sub-Brand	N/A	Thread Type	Serrated
Type	Structural wood screws	Contact Type Allowed	None
Material	Steel	Point Type	SawTooth Point
Package Quantity	30

Dimensions
Head Diameter (Inches)	0.93-in	Package Weight (lbs.)	3.5
Length Measurement	6-in	Screw Thickness	3/8-in

Features
Collated	No	Materials Fastened	Wood to wood
Drive	Hex	Multi-Material	No

Certifications
ACQ Approved	Yes	CA Residents: Prop 65 Warning(s)	No

Warranty
Warranty	None

Compatibility
For Use on Plastic	No	For Use on Concrete	No
For Use on Composite	No	For Use on Drywall	No
For Use on Metal	No	For Use on Brick	No
For Use on Wood	Yes	For Use on Vinyl	No

Miscellaneous
UNSPSC	31161500

Check out the Best Selling Wood Screws on Lowes.com

Review

4.8 out of 5

86 Reviews

97% Recommend this product

Ratings may include incentivized customer reviews.

What Customers Are Saying

The screws are durable and have strong holding power, able to securely anchor various materials. The self-tapping design makes installation quick and easy, eliminating the need for pre-drilling. The screws work well with both treated and untreated lumber, suitable for a range of project sizes. While a few customers reported issues with the screw heads, the majority found the screws to be a reliable and versatile choice.

Customer review summary generated by AI, including incentivized reviews.

86 Customer Reviews

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Clean

Good quality

DugzJanuary 22, 2026
From Strong-Drive SDWH Timber-Hex 3_SLASH_8-in x 4-in Hot-dipped galvanized Exterior Wood screws ( Verified Purchaser

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Simpson Strong-Tie Strong-Drive SDWH Timber-Hex 3/8-in x 6-in Hot-dipped galvanized Exterior Structural wood screws ( 30 -Per Box )

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