On 25-Jun-15 8:04 PM, Leon Fisk wrote:
On Thu, 25 Jun 2015 19:42:25 +0800
Techman wrote:

On 25-Jun-15 3:37 PM, 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.


I'm getting closer.

Some seem to be called Taptite,

http://www.shakeproof.com/images/products/taptite/taptite_160px_wide.png

And others "Type 23"

http://www.boltproducts.com/images/thread%20cutting%20-%20type%2023.gif

This Fastnal document may help:

http://www.fastenal.com/content/docu...renceGuide.pdf

Go to page 59 and look over the "Types of Screw Points". The
"Tri-lobular" point may work for your needs too...



Yep - thats them. Thanks.