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
Double Countersunk
Jan 06, 2021
Last reply: 5 years ago
4 Replies
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.
formatting link
The thread directly beneath the head is different as well
That's on that particular brand at least.
All in all, you'd imagine they'd be that more expensive to produce
michael adams
...
Ok thanks, I was visualising a machine screw, not a wood screw.
Join the Discussion
Have something to add? Share your thoughts — no account required.
Didn't find your answer?
Ask the community — no account required