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Correct Diameter of anchor for resistance

Posted by Hugh Moncktonover 2 years ago
Correct Diameter of anchor for resistance

I am currently assessing the capacity of an M20 HIT-HY 200 + HIS N anchor.

The diameter, da, is specified as 27.6mm in the calculations which is the cap screw diameter. Is this correct? I thought it should be 20mm?

Is the diameter of an M20 = 27.6mm?

Please see below

bonded anchors,Diameter
Structural Connections file 0
Snip1.JPG50.21 KB
Structural Connections file 1
Snip 2.JPG95.08 KB
Structural Connections file 2
Snip 2.JPG95.11 KB
Structural Connections file 3
Snip1.JPG50.21 KB
1 Reply
Posted by Ask HILTI Teamover 2 years ago

Thanks for your enquiry. I think you are slightly confused between the HAS-U anchor rods and the HIS-N which are an internally threaded female socket with the outside diameter of the socket will be larger versus a rod due to the 'wall thickness' hence for the HIS-N M20 the value of 27.6mm being utilised in the calculation.