NAS 4002 Fastener Area Calculation. Aerospace UNJ Thread

[gfthelen]

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

 

[drawoh]

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)[sup]2[/sup] [—] inch series

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

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

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

[ul]
[li]D is the nominal size in inches.[/li][li]d is the nominal size in mm. [/li][li]p is thread pitch in millimetres. [/li][li] n is the number of threads per inch.[/li]
[/ul]

--
JHG

 

[gfthelen]

Thank you, I will try it out.

Greg

 

[gfthelen]

JHG:

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

Thanks

 

[drawoh]

gfthelen,

My formula is showing pi over four.

"n" "[π]"

Fun with font rendering?

--
JHG

 

[gfthelen]

Thank you

My eyes are getting too old for me.

GT