Middle and Heavy Material JK430D-01 JK430D-02 for denim The JK430D computer controlled bartacking machine outperforms older models. JK430D computer-controlled high speed bartacking machine uses computerized direct-drive, which offers quick start and stop response. It achieves minimal shock and noise for the steel construction. The machine has servo-controlled feeding equipment as well as the best in-phase and travel needle pole equipment, which results in low tension. When sewing, no oil is used to avoid oil pollution. Specification: Stitch formation: single needle lock stitch Sewing speed: 3200rpm Sewing area: max 40 x 30 mm Feed mechanism: Y-0 internittent feed mechanism Stitch length:0.005-12.7mm Max number of stitches: 210000stitches,including 200000stitchese which can be added.