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Shear Breaking Strength

Shear Breaking Strength

Shear Breaking Strength

(OP)
I need to find the shear breaking strength of a tek screw.  I know the weight of the item fixed to this is 24kg pulling directly down.

RE: Shear Breaking Strength

What size screw?  What material is it tapped into.  How is the load applied, radius?



RE: Shear Breaking Strength

(OP)
Tek screw size is 5.5mm x 32mm screwed into structural steel perlin.  The load is pulling directly down from the fixing position along the length of the screw.

RE: Shear Breaking Strength

Assuming SAE J429 Grade 8 or equivalent material, 59,940 lbf.  This computation based on 32 mm full length engagement of the screw.

The pin (screw) has a maximum shear area/unit length engagement of 0.366 in^2/in, 0.539 in^2/in on the box (nut).  Expect the screw to strip prior to the nut letting go.

Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada

RE: Shear Breaking Strength

What is the thickness of the purlin as this will determine when the Tek will strip out?

RE: Shear Breaking Strength

What spec steel is the purlin?  HSLA will give different results than mild steel.  

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