Tensile strength and pull out force of a bolt

In summary, the conversation is about the tensile strength and pull out force of an M8, grade 8.8 bolt. The person is seeking information on what data to gather regarding the bolt and the material it is engaging in. They are also provided with the location of relevant formulas in the MACHINERY'S HANDBOOK 23 REVISED EDITION.
  • #1
Ben Laycock
Hi,

I'm looking for some help regarding working out the tensile strength of a M8, grade 8.8 bolt and the pull out force.

What information do I need to gather regarding the bolt and the material the bolt is engaging in to?

Thanks,
 
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  • #2
Most of the formulas are on pgs 1278-1279 of MACHINERY'S HANDBOOK 23 REVISED EDITION, INDUSTRIAL PRESS INC. New York, ISBN 0-8311-1200-X.
This is an older edition so the page numbers may have changed, the chapter is "Fasteners" and the section is "Working Strength of Bolts."

The chapter following is "Threads and Threading," which may also be useful.
 
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Likes Asymptotic, Nidum, Ben Laycock and 1 other person
  • #3
Thank you
 
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Likes Tom.G

What is tensile strength?

Tensile strength is the maximum amount of stress that a material can withstand before it breaks or permanently deforms. It is a measure of a material's ability to resist pulling forces.

How is tensile strength measured?

Tensile strength is typically measured in units of force per unit area, such as pounds per square inch (psi) or newtons per square meter (N/m^2). It is determined through standardized tests, such as a tensile test, where a material is pulled until it breaks.

What factors can affect the tensile strength of a bolt?

The tensile strength of a bolt can be affected by several factors, including the type and quality of the material, the diameter and length of the bolt, the manufacturing process, and the environmental conditions in which it is used.

What is pull out force?

Pull out force, also known as withdrawal force, is the force required to pull a bolt out of its designated hole or anchor point. It is a measure of the bolt's resistance to being pulled out under a load.

How is pull out force calculated?

Pull out force can be calculated by multiplying the area of the bolt's cross-section by its tensile strength. It can also be determined experimentally by applying a load to the bolt and measuring the force required to pull it out.

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