Duplex Nails

A duplex nail is a two-headed nail that was invented in 1916 by William Arthur Collings to replace common nails used in formwork. Before the invention of duplex nails, common nails were widely used in formwork. Today, duplex nails are most commonly used in temporary construction, such as building wooden scaffolding, formwork, or temporary wood braces. The nail is hammered only to the first head leaving a gap with the second so the nail can be easily removed using a hammer.

Size Ø, mm Length, mm Distance between heads, mm Top Head Ø, mm Lower Head Ø, mm Screw Ring Smooth
6D 2.87 50.8 6.35 5.95 7.15 +
8D 3.33 63.5 6.35 5.95 7.15 +
10D 3.76 76.2 9.55 5.95 8.75 +
16D 4.11 88.9 9.55 7.15 8.75 +
Other nail sizes, point, top and shank modifications are available upon request.

Nail shank types:

  • Smooth

Nail Cutting Point types:

  • Diamond

Nail finishing types:

  • Bright
  • White
  • Yellow

Also we can offer nails from low and high carbon or stainless steel.

500-1000 kg

big carton box

1 box

on a pallet

25 kg

small carton box

36 boxes

on a pallet

Nails can be packed in unlabeled carton boxes or carton boxes with our logo.
On request, individually selected logos, texts or other graphics may be printed on the packaging.
Other packaging options are available upon request.


  • What is a duplex nail?

    Duplex nail is a double-headed nail which is its distinctive feature.

  • 2. What is duplex nail used for?

    Duplex nails are most used in temporary construction, such as building wooden scaffolding, formwork, or temporary wood braces where nail removal is required.

  • 3. What duplex nail sizes I should use?

    The accepted rule of thumb is the nail length should be 2 times the thickness of the wood you are nailing through. Thus, for 25 mm. thick material, you would use 50 mm. nail and for 50 mm. thick material, you’d use a 100 mm. nail.

  • 4. What are duplex nail finishing types?

    Bright nails are not coated with a protective finish layer which means they are more vulnerable to outdoor conditions.

    Electro-galvanized (white) nails have a 12μ layer of zinc which offers corrosion protection. They are generally used in areas where minimal corrosion protection is needed.

    Electro-galvanized (yellow) nails offer the same corrosion protection as white galvanized nails the only difference is the color.

  • 5. What is the price of duplex nails?

    Raw material prices are always changing so it is difficult to set constant prices. To get a quotation of our updated product prices, please contact us via email or fill out the inquiry form on our product page.