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Anonymous Poster

Tightening Torque

02/24/2009 3:10 AM

How to calculate in NM prestressing HTS bolt 10.9 M24 @ 390 (+/- 5) BAR oil pressure ?
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sb
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Join Date: Mar 2007
Posts: 2550
Good Answers: 103
#1

Re: Tightening torque

02/24/2009 4:07 AM

What is the surface area of the cylinder ?

Stress = Pressure X Area / Bolt effective Crossection.

(1) Pressure you have provided

(2) Area - only you know

(3) Bolt Crossection area - available in any facstener hand book

Bolt Grade (10.9) - Immaterial.

Pitch - necessary for (3)

So there ...

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Codemaster
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Join Date: Jul 2005
Location: Stoke-on-Trent, UK
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#2

Re: Tightening Torque

02/24/2009 11:59 AM

Guest

Recommended torque for grade 10.9 M24 is 1120 Nm. This gives bolt stress 660 MPa, which is 85% of proof load stress.

Cheers...........Codey

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