Thread Length Calculator for Countersunk High-Strength Structural Bolts to BS EN 14399-7 (HR CSK)

Thread Length Calculator for Countersunk High-Strength Structural Bolts to BS EN 14399-7 (HR CSK)

Maximum bolt length = 300 mm

The values produced on this calculator are for information purpose only. They are calculated using formulas stated in relevant standard and are provided in good faith and for your guidance only. Andrews Fasteners Limited can not accept any liability for actions taken by third parties based on this information.

Length X
Thread b (ref.):
Minimum thread (full thread):
Maximum thread inc. run out:
ls min:
lg max:
Version: JS/1.04.230721.14399.7.2007

Whilst the information is provided in good faith, Andrews Fasteners Ltd are not under any responsibility or liability in respect of errors or information that was found to be incorrect or for any reliance the user may place on it.

Bolt lengths shorter than listed below, need to be considered as bolts with shortened thread length:
M12x55, M14x65, M16x70, M18x80, M20x85, M22x90, M24x100, M27x120, M30x130, M36x150

Minimum value refers to full thread.
Maximum value refers to maximum thread including run out (incomplete thread).

See also: Thread Length (HR) Calculator for bolts EN 14399-3

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