(USA) How Do I Calculate the Design Strength of Inclined Screws?

Fully threaded self-tapping screws are optimized for axial loading. By sufficiently inclining the screws toward the line of the force, lateral connections are predominantly characterized by axial effects rather than dowel effects, which produces stiff, high strength connections.
Normal 2  2
The simplified truss model is a highly practical and effective calculation method for inclined screws. This model is based on the idea that all design strength can be considered as the product of axial effects only, and that dowel effects can be neglected for the sake of practicality. Verification testing in North America using ASD values has so far not considered the friction component, so it it not included in the model at this time. The design equation for inclined shear-tension screws arranged mutually parallel in a connection is included below:
Normal 1654

Relevant Technical Resources

Gallery capture Webinar: Advanced Theory and Behavior of Inclined Screws
Gallery webinar basic theory behavior inclined screws Webinar: Basic Theory and Behavior of Inclined Screws
Gallery dg   assy fastener catalog cover American Structural Screw Design Guide

Products Covered in this Article

Gallery assy vg csk explosion resized ASSY VG CSK Counter Sunk Head
Gallery assy vg cyl explosion resized ASSY VG CYL Cylinder Head
Gallery assy vg rh explosion ASSY VG RH Reverse Head
Gallery handbooksmall USA Heavy & Mass Timber Connections Handbook

Still Have Questions? Send Us an Email and an Engineer Will Assist You

Or Call Us at