Countersunk screws I understand, they have been around a long time. But double-countersunk - what does that mean? I am looking at the screw supplier's web page and they look like countersunk, only half the price (some of them) TW
COUNTERSUNK HEAD Designed for countersinking into timber for a flush or recessed finish.
DOUBLE COUNTERSUNK HEAD Improved design on the countersunk head to give additional head strength and assist countersinking.
How does that work ?
They've got "nibs" on the underside of the head so as to shape the countersink, rather than simply being smooth. Same as on one pattern of traditional countersunk bits.
That's on that particular brand at least.
All in all, you'd imagine they'd be that more expensive to produce
michael adams
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Ok thanks, I was visualising a machine screw, not a wood screw.
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