On Thursday, June 25, 2015 at 4:50:12 PM UTC-4, Gunner Asch wrote:
On Thu, 25 Jun 2015 12:05:20 -0700 (PDT), wrote:

On Thursday, June 25, 2015 at 12:26:59 PM UTC-4, Clare wrote:
On Thu, 25 Jun 2015 15:37:07 +0800, Techman
wrote:

I'm looking for some screws for use in production work.

*Sick of tapping lots of M4 and M4 holes.
*Used for attaching small brackets and DIN rail etc.
*Fixing to to mild steel 3mm thick or to 1.6mm thick Zinc Anneal sheet.

I've seen screws like in the links below but am having trouble finding
them. When I look for self tapping screws I find the coarse thread type
rather than the defined M4x0.7 or M5x0.8 threads.

Is there a proper name for these screws:


https://dl.dropboxusercontent.com/u/92240200/Tapping%20Screw%20(1).JPG

https://dl.dropboxusercontent.com/u/92240200/Tapping%20Screw%20(2).JPG


Thanks.

They are called thread forming screws.

On jobsites, I've just heard them called tappets.

Must be one of those regional things...never heard that term
used for anything other than engines

Its short for "tappet screws". They help attach straps to sheet metal studs.