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The threading on an M20 bolt, which runs along its entire length, enables it to engage with corresponding threads in nuts or tapped holes, providing a robust mechanical connection. The pitch, the distance between each thread, is standardized for M20 bolts as per ISO standards, usually 1.5mm for coarse threads and 1mm for fine threads. The choice between coarse and fine threads depends on factors like load-bearing capacity, vibration resistance, and ease of assembly.

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8 galvanized carriage bolts with nuts and washers