How to determine the maximum effective clamping length for the flat head tapping screw?

The effective length of the flat head self tapping screws is the length of the threaded fit.

For flat head self tapping screws that have an end cone length specified, the maximum effective design clamping length can be determined by subtracting the length of the largest tapered portion from the minimum screw length. For self-tapping screws of type AB, A, and BP, the end length is not included in the size, and the maximum effective clamping length must be calculated by appropriately reflecting the maximum end length coefficient. Note that for combination screws, the increase in gasket thickness must be considered when determining the maximum effective clamping length. The formula for calculating the maximum effective clamping length:

Y=L-Z

Y: maximum effective clamping length (minimum distance from the head to the end of the first buckle complete thread)

L: minimum screw length

Z: end length factor (see the figure below)

The above is the calculation of the maximum effective clamping length of the flat head self tapping screws. Would you?

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