French toolmaker and knifemaker
A Few Products
Stitch Spacing Tool Sizing
Blanchard numbers pricking irons and pricking wheels by the number of stitches per Paris inch, equal to 1.0657 inch or 27.069 millimeters. These sizes are not equivalent to stitches per British Imperial or United States customary inch.
| Number | Space Between Marks (Per Blanchard) |
Stitches Per US Inch (Derived) |
|---|---|---|
| 4 | 6.75 mm | ≈3.76 |
| 5 | 5.40 mm | ≈4.70 |
| 6 | 4.50 mm | ≈5.64 |
| 7 | 3.85 mm | ≈6.60 |
| 8 | 3.38 mm | ≈7.51 |
| 9 | 3.00 mm | ≈8.47 |
| 10 | 2.70 mm | ≈9.41 |
| 11 | 2.45 mm | ≈10.37 |
| 12 | 2.25 mm | ≈11.29 |
| 16 | 1.70 mm | ≈14.94 |