How Much Do You Know The Difference Between Duplex Nails And Screws?

Duplex Nails?and Screws are flanged-head or double-headed fasteners that are often used to build temporary structures such as braces, scaffolding, and concrete formwork. They’re designed to be removed with ease, so they do not completely go into the wood during installation.

First came the nail

Duplex Nails are as strong as regular nails, but the double head makes them easier to remove with a claw hammer or crowbar. Workers drive the nail until the lower flange is flush with the material. With a pull bar or the reverse end of a claw hammer, the nails pull out after the job is complete.

Depending on the application, if a lot of force or bending is necessary to remove the nails, they might not be reusable.

Then came the screw

Duplex Screws feature a double-hex head, which accepts a variety of driving tools — including a pile driver or hex-head screwdriver — for installation and removal after use. The driver drills the orange hex-head screw until the stop flange is flush with the material and can easily remove it by reversing the drill.

Since there’s no need to force the removal, the screw maintains its shape and can be reused multiple times.

Timed tests

In timed comparison studies, Duplex Screws outperformed Duplex Nails by a wide margin. During three workdays, a pair of concrete-form setters built a 50 x 50 lineal-foot form. One worker used only Duplex Nails and the other worker used Duplex Screws.

The Duplex Screw user outperformed the Duplex Nail driver in setting and form stripping, completing the task in six compared to eight hours.

To hammer or drill?

It all comes down to convenience, cost, and performance. Duplex Nails are readily available in a multitude of styles and sizes and are sold everywhere. Duplex Screws are only available from select distributors, come in sizes 1-1/4, 1-5/8, 1-3/4, and 2-3/4 inches. They cost more than Duplex Nails.

However, Duplex Screws outperform Duplex Nails and are reusable. All of these factors that must be weighed when deciding on what fastener is the right one for the job.

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