Shear force load capacity WAF screw

[NyHusägare32]

Hello,

I saw in a catalog from Essve for their WAF screw that the load capacity for shear forces was significantly higher for, for example, 5x50 than for 10x50.

Which was counterintuitive for me. Have I misunderstood or is that the case? And if so, why?

Link to the catalog: https://www.essve.se/wcsstore/CAS/PIM/ESSVE/docs/1093089.pdf

 

[Granngubben]

Hi,
I saw in a catalog from Essve for their WAF screws that the load capacity for shear forces was significantly higher for, for instance, 5x50 than for 10x50.

Which was counterintuitive to me. Have I understood this wrongly or is that the case? And if so, why?

Link to catalog: [link]

That's how it is according to the tables, and the reason is, I would guess, that a joint with a 5mm screw in wood with a 20 mm thickness has greater shear force capacity than a joint with a 10mm screw in wood with a 5 mm thickness, (as shown in the tables). The weakest link in the joint is the wood in the given examples.