221225008 Bobbin Shaft Gear (Z-stitch Sewing Machine) and 221225007 Lower Shaft Gear (Z-stitch Sewing Machine)

Product No. 221225008 bobbin shaft gear is categorized as a spiral bevel gear, serving as a dedicated transmission component for Z-stitch sewing machines. This gear features a pressure angle of 20°, a module of 0.9, 24 teeth, a gear ratio of 1, and a spiral angle of 35° left-hand (35°/L). In terms of structural dimensions, it has an inner diameter of 7.94mm, an outer tooth diameter of 22mm, an overall length of 10.05mm, with a unit weight of 0.1292kg. Made of 20CrMo alloy steel, it undergoes a sophisticated manufacturing process including sawing → turning → threaded hole machining → reaming → gear milling → heat treatment → shot blasting → marking → reaming → surface capping → overall length grinding → demagnetization → screw assembly. Full-process quality control ensures the gear’s dimensional accuracy, tooth surface hardness and assembly compatibility. This gear can accurately match the power transmission requirements of the bobbin shaft of Z-stitch sewing machines, facilitating the stable completion of Z-stitch sewing operations, and acts as a key component of the bobbin rotation system of Z-stitch sewing machines.

Product No. 221225007 lower shaft gear belongs to the spiral bevel gear category, acting as a core component of the lower shaft transmission system of Z-stitch sewing machines. It has a pressure angle of 20°, a module of 0.9, 24 teeth, and a spiral angle of 35° right-hand (35°/R). Regarding structural dimensions, it has an inner diameter of 7.94mm, an outer tooth diameter of 22mm, an overall length of 15.85mm, with a unit weight of 0.022kg. Made of the same 20CrMo alloy steel, it adopts the identical precision manufacturing process as the bobbin shaft gear: sawing → turning → threaded hole machining → reaming → gear milling → heat treatment → shot blasting → marking → reaming → surface capping → overall length grinding → demagnetization → screw assembly. It is precisely compatible with the lower shaft of Z-stitch sewing machines, achieving stable power transmission, ensuring the efficient operation of the lower shaft drive mechanism of sewing machines, and serving as an important transmission component for the normal operation of Z-stitch sewing machines.