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GCSE Design and Technology · key term
A hole large enough for a screw or bolt to pass through without its thread engaging with the material.
Used by Edexcel and Eduqas
Specification 7.7.3 · Paper 1
A hole through the first component that allows a screw to pass freely without its threads gripping that component.
Revise: Timber Fabrication and FixingsA clearance hole through the first piece lets the screw pass freely, so its head can pull that piece tightly against the receiving timber. For a countersunk screw, cut a tapered recess so the head can sit flush; a domed head does not need this recess.
Component 1
Distinguish a pilot hole, which lets screw threads grip the receiving timber, from a clearance hole, which lets the screw pass freely through the first piece.
Distinguish a pilot hole, which guides a screw, from a clearance hole, which lets its thread pass through freely.
Distinguish a clearance hole, which lets a screw pass freely, from a tapping hole, which is prepared to receive an internal thread.
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A hole large enough for a screw to pass through without its thread engaging.
A clearance hole allows the screw to pass through the first piece without its thread gripping that piece.
