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Saddle Stitching Specifications Muller Martini Prima Stitcher: Gatherer
Minimum untrimmed signature (HF lip)	3 1/8 x 3 ½”
Minimum untrimmed signature (LF lip)	3 ½ x 3 ½”
Maximum untrimmed signature (HF lip)	12 5/8 x 18 7/8”
Maximum untrimmed signature (LF lip)	11 13/16 x 18 7/8”
Minimum untrimmed signature (no lip)	3 1/8 x 3 ½”
Maximum untrimmed signature (no lip)	11 13/16 x 17”
Minimum size cover feeder	6 ½ x 3 ½"
folding to	3 Ό x 3 ½”
Maximum size cover feeder	20 ½ x 12 Ό"
folding to	10 Ό x 12 Ό”
Stitcher
Maximum thickness cover to cover	3/8”
Maximum thickness cover to cover loop heads	3/16”
Maximum thickness cover to cover narrow heads	1/8”
Minimum size untrimmed	4 5/16 x 6”
Maximum size untrimmed	12 5/8 x 18 7/8"
Minimum distance between stitches
(for book up to 1/4” thick - HK 55 narrow heads)	2”
(for book up to 3/8” thick - HK 75 heads)	3”
Loop stitching: minimum distance	3 3/16” cc min.
Between stitches (1, 2, or 3 stitches)    from head or foot to center of stitch	minimum 1”

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