The distance between the stitching line and the spine of the book: 5mm for the book below 100 pages, and 5-8mm for the book above 100 pages.
Number of stitches for sewing: 32 format for 12 ± 2 stitches; 16 format for 17 ± 2 stitches; 64 format for 7 ± 2 stitches.
Sewing stitching pitch: 3 to 4 mm below 16 pages.
Three 32-ply cotton yarns are used for stitching.
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