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A. Spruce
Re: nails or screws?
canuk wrote:

So --- tell me how screws that are manufactured using the same or better metals as nails have less shear strength?

Perhaps when you over torque them is when you see them snap.
Have you ever snapped the head off a bolt --- the same bolt that has significant shear strength?

Shearly you jest ... ;):p

canuk
Re: nails or screws?
A. Spruce wrote:

Shearly you jest ... ;):p

Oh geez --- has it come down to this :rolleyes::p:D

Sten
Re: nails or screws?
canuk wrote:

So --- tell me how screws that are manufactured using the same or better metals as nails have less shear strength?

Perhaps when you over torque them is when you see them snap.
Have you ever snapped the head off a bolt --- the same bolt that has significant shear strength?

I don't recall snapping the head off a nail. :D;)

canuk
Re: nails or screws?

With the thousands of nails I've seen there's been lots of heads pulled off.:D

Sten
Re: nails or screws?
canuk wrote:

With the thousands of nails I've seen there's been lots of heads pulled off.:D

Well then your the King, LOL :D

JLMCDANIEL
Re: nails or screws?

Nail a joist to the rim joist and the house settles or the wood shrinks and pulls the nail out a ¼" it still holds pull a screw out a ¼" and it looses its hold.
Jack

canuk
Re: nails or screws?

Ah Jack --- now we are talking tension and compression -----the nail slides out therefore the wood moves.
The screw doesn't slide and holds the wood together --- until the tension exceeds the wood fiber strength and tear out happens around the threads..
It's very similar to using spiral shank nails --- called Ardox up here.

canuk
Re: nails or screws?
Sten wrote:

Well then your the King, LOL :D

Nope --- just an old nail bender:cool:

canuk
Re: nails or screws?

Side note --- screws are allowed in jurisdictions around these parts to be used in structural framing..

Gizmo
Re: nails or screws?
canuk wrote:

So --- tell me how screws that are manufactured using the same or better metals as nails have less shear strength?

Perhaps when you over torque them is when you see them snap.
Have you ever snapped the head off a bolt --- the same bolt that has significant shear strength?

Not all screws have the same shear rating as nails. I think simpson has shear rated screws for there hangers. Some grabbers have a good rating...... Try and cut a tap con there tougher than nails, We have to use shear rated screw in Florida for the hurricanes. You have to use the exact screws that a specified on the engineered drawing or you will fail the inspections

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