Why do some big CHC and FHC screws with the same part number have a different threaded length?
Generally these screws are made for joining: only the threaded part of the screws is used. The “short” screws are entirely threaded. For “long” screws, conforming to standards, their threaded length is between twice and five times as big as their nominal diameter. For the screws whose length is near the limit, it depends on the supplier; the screws can be all threaded or partly threaded. Generally, it is better to use the entirely threaded CHC and FHC screws because they are made to work with a tractive effort; if you need a smooth surface to fit a bearing or another component, it is better to use the SHS, SHSS or HSS washer-head screws.
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