×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

NAS 4002 Fastener Area Calculation. Aerospace UNJ Thread

NAS 4002 Fastener Area Calculation. Aerospace UNJ Thread

NAS 4002 Fastener Area Calculation. Aerospace UNJ Thread

(OP)
Hello All;
Not sure this is the place for this question, but....
For this NAS 4002 Spec, Fastener Testing, Table III shows the Nominal Thread size and TPI, the Nominal Size (IN.) and the Thread pitch area at Max Dia.
Then the values for Min Tensile for Types I, II and III.
Is there a formula for this UNJ stress area of the fastener?

The standard F-606 Area Calculation is NOT correct for this sample. This formula uses the Thread Pitch Dia. in the equation. Would like the formula so I can direct calculate the area in place of a look up table to find area.

Thanks for your help and I have attached the Page for this table.
Regards,
Greg Thelen

RE: NAS 4002 Fastener Area Calculation. Aerospace UNJ Thread

gfthelen,

I have the Handbooks of Bolts and Bolted Joints here, by John H. Bickford and Sayed Nasser. Bickford's stuff has been highly recommended over and over again. On page 165, they show the following...

AT = π/4 × (D - 0.9743/n)2 — inch series

AT = π/4 × (d - 0.9382p)2 — metric series

AT = π/4 × (D - 0.6495/n)2 — inch UNJ series

AT = π/4 × (d - 0.6495p)2 — metric MJ series

  • D is the nominal size in inches.
  • d is the nominal size in mm.
  • p is thread pitch in millimetres.
  • n is the number of threads per inch.

--
JHG

RE: NAS 4002 Fastener Area Calculation. Aerospace UNJ Thread

(OP)
Thank you, I will try it out.

Greg

RE: NAS 4002 Fastener Area Calculation. Aerospace UNJ Thread

(OP)
JHG:

Just making sure of this: Your Metric MJ Formula is showing "n/4" do you mean "p/4" Since it is Metric

Thanks

RE: NAS 4002 Fastener Area Calculation. Aerospace UNJ Thread

gfthelen,

My formula is showing pi over four.

"n" "π"

Fun with font rendering?

--
JHG

RE: NAS 4002 Fastener Area Calculation. Aerospace UNJ Thread

(OP)
Thank you

My eyes are getting too old for me.

GT

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close