Nail sizes

brad nail sizesIn most countries, nails are described by their dimensions in millimeters, for example “50 × 3” indicates a nail 50 mm long(not including the head) and 3 mm in diameter. In the United States, however, the length of a nail is designated by its penny size, written with a number and the abbreviation d for penny, a system that originated in England centuries ago. A larger penny number indicates a longer nail. Most nails are sized by length and wire gauge. For the wire gauge, the bigger the number, the thinner the nail.

Nail sizes – length of steel nails
(Penny-Inch-Millimeter equivalents)

  • 2d = 1″ = 25mm
  • 3d = 1-1/4″ = 32mm
  • 4d = 1-1/2″ = 38mm
  • 5d = 1-3/4″ = 44mm
  • 6d = 2″ = 51mm
  • 7d = 2-1/4″ = 57mm
  • 8d = 2-1/2″ = 65mm
  • 9d = 2-3/4″ = 70mm
  • 10d = 3″ = 76mm
  • 12d = 3-1/4″ = 83mm
  • 16d = 3-1/2″ = 89mm
  • 20d = 4″ = 102mm
  • 30d = 4-1/2″ = 115mm
  • 40d = 5″ = 127mm
  • 50d = 5-1/2″ = 140mm
  • 60d = 6″ = 152mm

Nail sizes – diameter of steel nails
(Gauge-Inch-Millimeter equivalents)

  • 7/0 = 0.4900 = 12.45mm
  • 6/0 = 0.4615 = 11.72mm
  • 5/0 = 0.4305 = 10.93mm
  • 4/0 = 0.3938 = 10.00mm
  • 3/0 = 0.3625 = 9.2076mm
  • 2/0 = 0.3310 = 8.407mm
  • 0 = 0.3065 = 7.785mm
  • 1 = 0.2830 = 7.188mm
  • 1½ = 0.272 = 6.91mm
  • 2 = 0.2625 = 6.668mm
  • 2½ = 0.253 = 6.43mm
  • 3 = 0.2437 = 6.190mm
  • 3½ = 0.234 = 5.94mm
  • 4 = 0.2253 = 5.723mm
  • 4½ = 0.216 = 5.49mm
  • 5 = 0.2070 = 5.258mm
  • 5½ = 0.200 = 5.08mm
  • 6 = 0.1920 = 4.877mm
  • 6½ = 0.184 = 4.67mm
  • 7 = 0.1770 = 4.496mm
  • 7½ = 0.170 = 4.32mm
  • 8 = 0.1620 = 4.115mm
  • 8½ = 0.155 = 3.94mm
  • 9 = 0.1483 = 3.767mm
  • 9½ = 0.142 = 3.61mm
  • 10 = 0.1350 = 3.429mm
  • 10¼ = 0.131 = 3.33mm
  • 10½ = 0.128 = 3.25mm
  • 11 = 0.1205 = 3.061mm
  • 11½ = 0.113 = 2.87mm
  • 12 = 0.1055 = 2.680mm
  • 12½ = 0.099 = 2.51mm
  • 13 = 0.0915 = 2.324mm
  • 13½ = 0.086 = 2.18mm
  • 14 = 0.0800 = 2.032mm
  • 14½ = 0.076 = 1.93mm
  • 15 = 0.0720 = 1.829mm
  • 15½ = 0.067 = 1.70mm
  • 16 = 0.0625 = 1.588mm
  • 16½ = 0.058 = 1.47mm
  • 17 = 0.0540 = 1.372mm
  • 17½ = 0.051 = 1.30mm
  • 18 = 0.0475 = 1.207mm
  • 18½ = 0.044 = 1.12mm
  • 19 = 0.0410 = 1.041mm
  • 19½ = 0.038 = 0.97mm
  • 20 = 0.0348 = 0.884mm

Apart from nail sizes, nails are classfied according to heads, shanks, points, materials, finishes. Please click here to check.

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