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Heavy duty machines typically have higher maximum sewing speeds, around 1500 stitches per minute, versus 1000-1200 stitches per minute for standard machines. Again, this allows them to work through heavy fabrics more efficiently. However, heavy duty machines also tend to sew better at slower speeds, in the 500-800 stitch per minute range, for optimal control through thick seams. So they provide a wider speed range to suit the fabric.

Industrial sewing machines for auto upholstery are engineered to handle a variety of materials, including leather, vinyl, and specialized fabrics that are commonly used in vehicles. These machines are built for durability, as they need to sew through multiple layers of thick materials while maintaining precise stitch quality. The average automobile can have intricate stitching designs, which require high-speed and accurate sewing machines to ensure a flawless finish.