Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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leather substance table

The measurement of the thickness of a finished leather, in millimeters (1 mm. 0.03937 inch), irons (1 iron = 1/48 inch), or ounces (1 ounce = 1/64 inch): 
Inch        Ounces     Irons      Millimeters
1/64         1          .75         0.4
1/32         2         1.5          .8
3/64         3         2.25        1.2
1/16         4         3.0         1.6
5/64         5         3.75        2.0
3/32         6         4.5         2.4
7/64         7         5.25        2.8
1/8          8         6.0         3.2
9/64         9         6.75        3.6
5/32        10         7.5         4.0
11/64       11         8.25        4.4
3/16        12         9.0         4.8
13/64       13         9.75        5.2
7/32        14         10.5        5.6
15/64       15         11.25       6.0
1/4         16         12.0        6.4
17/64       17         12.75       6.8
9/32        18         13.5        7.2
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This page last changed: November 06, 2007