screws safety factors

[EL]

I have to check the B screws (subgirt to structure) of a building. The safety factors used in our company are undecided (from 2 to 4). Could anybody suggest any refference for screws safety factors in construction?
Thanks in advance.

 

[ishvaaag]

Table 3.4 in
Residential Steel Framing Handbook
Robert Schareff and the editors of the Walls and Ceilings Magazine
Mc Graw Hill
1996
p. 71

gives capacity for steel to steel connections

 

[Ron]

For steel-to-steel in tension, I try to use 2.5 or greater safety factor as general guide. Same for shear. For embedded anchors in concrete, I use 4 to 5. Most anchor manufacturers use 5.

I don't have a specific reference for this, just a practice.

 

[Peabody]

I Am not sure what type of screw you are inquiring about. I think your asking about self tapping screws.I suggest that you contact the Indugtrial Fasteners Institute, Cleveland , OH 44114.