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

On Wednesday, 6 January 2021 at 18:50:17 UTC, TimW wrote:
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.

On Wed, 06 Jan 2021 11:19:42 -0800, polygonum_on_google wrote:

On Wednesday, 6 January 2021 at 18:50:17 UTC, TimW wrote:
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 ?

"jon" wrote in message ...
On Wed, 06 Jan 2021 11:19:42 -0800, polygonum_on_google wrote:

On Wednesday, 6 January 2021 at 18:50:17 UTC, TimW wrote:
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.

https://static.cmostores.com/uploads...h=500&fit=crop

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

....

On Thu, 07 Jan 2021 17:28:06 +0000, michael adams wrote:

"jon" wrote in message
...
On Wed, 06 Jan 2021 11:19:42 -0800, polygonum_on_google wrote:

On Wednesday, 6 January 2021 at 18:50:17 UTC, TimW wrote:
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.

https://static.cmostores.com/uploads...ews-ribs-head-
close-up-1569833563.jpg?auto=compress&w=500&h=500&fit=crop

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.