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Heavy duty sewing needles are specially crafted to sew through multiple layers of fabric, heavy materials like denim, upholstery, leather, and canvas. The most notable difference between standard needles and heavy duty needles lies in their construction. Heavy duty needles have a thicker shaft and a larger eye, which allows them to accommodate thicker threads and withstand greater tension without bending or breaking. They come in various sizes, with the most commonly used sizes ranging from 90/14 to 110/18, indicating their increased strength and capacity for thicker materials.

Lock stitch is a sewing technique that involves interlocking two threads—one from the needle and the other from the bobbin—to create a strong seam. This method is particularly advantageous for securing the seams of jumbo bags because it provides a tight, secure closure that can withstand significant tension and pressure. Unlike other stitching methods, lock stitch produces a consistent and uniform seam, reducing the likelihood of bag failure due to seam separation.

One of the primary advantages of the coverstitch chain stitch is its durability. The unique design creates a seam that can withstand the stresses and strains inherent in wear and motion. This is particularly vital for activewear and other garments that require a high degree of flexibility. Furthermore, the coverstitch is less likely to fray or lose its shape compared to standard stitching methods.

The key components of a leather stitching machine include a robust motor, a walking foot mechanism, and specialized needles. The walking foot is crucial as it helps to feed multiple layers of leather evenly, preventing slippage during sewing. This is particularly important when working with thicker leather, which can be challenging to handle manually.