Wood screw
ASME B18.6.1; DIN 95/97 historic, now mostly maker specs
Sizes
Gauge #2-#20, lengths 12 mm to 150 mm
Drive & head
Pozi, Phillips, square (Robertson), Torx or slotted
Materials
Steel, stainless, brass, silicon bronze
Strength / grades
Not strength graded - chosen for corrosion resistance
Hole and pilot guidance
Pilot hole equal to the screw's core diameter in hardwood, slightly smaller in softwood; clearance hole in the top piece so it pulls tight.
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Where it is used
Furniture and cabinet assembly
Tapered shank and coarse thread grip solid timber and plywood
View sourceWatch out for
- No pilot hole in hardwood splits the timber.
- Overdriving chews out the fibres and the screw loses its grip.
- An old hole never holds as well - go one size up or plug and redrill.