To meet accepted standards, side sewn books must not be more than 3/8 inch thick and have less than 3/4″ gutter (interior) margin. Less binding margin will lead to broken spines as the readers seek the knowledge on the interior of the pages. Side stitching employs a lock stitch. Gregath standards do not allow for rounded spines – we offer a flat-back spine standard. This is mainly due to economy as the rounding process is an extensive step.

Please note that, though LBI standards do not endorse color lamination, this product meets or exceeds as many standards for quality, durable binding as we could find.

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This section is drawn from
http://www.gregathcompany.com/hb/color/sidesewn.html
 

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