self tapping screws to HSS
self tapping screws to HSS
(OP)
I have a lightly loaded connection (250# Shear) that was originally designed as a plate weled to a HSS section. The contractor wants to use a scew, #8 self tapping. I am doubtfull it will cut through the 1/4" plate and the 1/4" HSS, so I am considering pre drilling. Does anyone know of any trouble pre-drilling for self tapping screws?
Thanks
Thanks






RE: self tapping screws to HSS
http://www.icc-es.org/reports/pdf_files//ESR-1976....
The only time I have had the clients pre-drill holes is when I am attaching through something that is thicker to something that is thinner.
RE: self tapping screws to HSS
RE: self tapping screws to HSS
I am just worried that they will not get properly installed if the screw will not drill thru the two thicknesses.
RE: self tapping screws to HSS
RE: self tapping screws to HSS
Drill size could be full nominal thread diameter (0.188 inch) for fastest assembly. Could be root diameter, but screws forcing their way through base plate 1 into baseplate 2 often "push" the two plates apart when the threads try to begin tapping/drilling/machining their way into the second plate unless a LOT of force is used on the screwdriver.
RE: self tapping screws to HSS
http://www.lindapter.com/american/Products/Hollow_...
RE: self tapping screws to HSS
RE: self tapping screws to HSS
RE: self tapping screws to HSS
Where do we stop engineering, and just start using prescriptive design?
RE: self tapping screws to HSS
If they are pushing, you can always choose a couple of predrill sizes and mockup a couple of test articles. Load to failure and go from there with a healthy FS.
ZCP
www.phoenix-engineer.com
RE: self tapping screws to HSS
RE: self tapping screws to HSS
RE: self tapping screws to HSS
RE: self tapping screws to HSS
RE: self tapping screws to HSS
RE: self tapping screws to HSS
RE: self tapping screws to HSS