#20 Silicon Bronze Wood Screw
20 Bronze Wood Screw - Large
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#20 Silicon Bronze Wood Screws

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Slotted Drive, Flat Head #20 Silicon Bronze Wood Screws

These Silicon Bronze wood screws are the highest quality available. We carry them in a variety of sizes and lengths.

#20 Wood Screw Dimensions:
 Head Diameter (Imperial) Head Diameter (Metric) Shank Diameter (Imperial) Shank Diameter (Metric)
0.600" (~39/64") 15.21mm
0.312" (~5/16") 7.92mm

What makes our wood screws the best?


Full Body: Our bronze wood screws have a shank diameter that is the same size as the outside of the threads. That means your clearance hole will be completely filled, creating a waterproof seal. Full bodied screws are made from a larger wire stock than screws that aren't full bodied, meaning they are stronger when they hold and stronger when you are driving them in.

Cut Threads: The threads are cut, not rolled. Rolled threads have a reduced shank size, and but ours have a full sized shank and sharper threads. Most other companies produce rolled thread screws and you'll find they twist and break when driving them in, and can leave a compromised fastener in your project without even knowing it.

Cold Pressed Heads: The heads on these screws are cold formed, which hardens them through a process called "work hardening". Experience less stripped screw heads with our cold pressed heads.

Guaranteed 651 Silicon Bronze Alloy: We guarantee that you'll get the correct alloy when you order through us. 651 Silicon Bronze is the ideal alloy for bronze screws in your traditional boat building project, therefore it's the only alloy we will supply our wood screws in. The others may be cheaper, but they're likely not the silicon bronze alloy they claim to be.

Traditional boatbuilders know that there is a glut of imposter alloys and bargain bronze wood screws out there on the market, but Fair Wind Fasteners only supplies Silicon Bronze wood screws of the highest marine grade.

What is a Frearson or Reed & Prince Drive?

Check our wood screw size chart.

Fair Wind Screw Lube



Don't forget to add some Screw Lube to help drive these screws home. Less effort in driving, less stripped heads, and protection from corrosion is right here with Fair Wind Screw Lube - Specifically formulated for boat building!


Customer Reviews

Based on 4 reviews
Michael Tammaro
Amazing Find

I needed #20 silicon-bronze wood screws in 5-inch lengths. I searched the internet for hours and visited many local stores. One day, while searching a hardware store, a customer told me about Fair Wind Fasteners (FWF). I contacted them and they were able to get me what I needed quickly. I'm sure FWF will become, or already is, an invaluable resource to many others.

Need Big Screws? No problem.

Difficult to find #20 wood screws. Needed to attach jaw face to a vise. Very good quality.

Robert Christensen

Company is fantastic and are very quick in shipping. Products are great

Dean Gridley

It was easy to select the fasteners I wanted. I received my order in five days which was reasonable. I would purchase from Fair Wind in the future.