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A spiral binding consists of a continuous wire, which is coiled through evenly spaced holes that have been punched into the pages of a book. The spiral wire can be made
of metal, plastic, or plastic coated metal. Plastic is available in a variety
of colors, but the metal spiral has a limited color selection. When the books
are open, the pages lie flat. The pages can also be folded over completely,
which makes spiral binding a good choice for training manuals, cookbooks, notebooks,
and calendars.
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Diameter Guide for Spiral Binding
The examples below are based on booklets consisting of
20 lb. bond pages with heavy weight covers on the front and back.
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Number of sheets
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Approx. thickness including covers
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Coil diameter
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30 (60 pages)
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1/8"
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6 mm
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40 (80 pages)
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5/32"
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7 mm
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50 (100 pages)
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3/16"
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8 mm
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60 (120 pages)
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7/32"
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9 mm
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70 (140 pages)
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9/32"
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10 mm
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80 (160 pages)
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5/16"
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11 mm
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90 (180 pages)
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11/32"
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12 mm
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100 (200 pages)
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3/8"
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13 mm
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110 (220 pages)
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7/16"
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14 mm
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125 (250 pages)
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1/2"
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16 mm
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140 (280 pages)
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9/16"
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18 mm
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160 (320 pages)
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5/8"
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20 mm
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180 (360 pages)
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11/16"
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22 mm
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210 (420 pages)
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13/16"
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25 mm
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230 (460 pages)
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15/16"
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28 mm
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250 (500 pages)
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1"
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30 mm
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265 (530 pages)
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1-1/16"
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32 mm
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