The new ASTER 51x44 is a fully automatic book sewing machine able to handle signatures of sizes up to 510 x 440 mm (spine x width). It also handles sizes as small as 150 x 120 mm, offering the same basic features and the same engineering quality found on top models of the Aster range.
| Maximum mechanical speed | 8,400 sign./hour |
| Number of vacuum openings | 4 top, 4 bottom |
| Minimum size | 75 x150 mm |
| Maximum size | 440 x 510 mm (17 1/4"x20") |