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what size screw??

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carlossa52(at)gmail.com
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Posted: Mon Nov 12, 2007 7:49 pm Post subject: what size screw??

Hello, all



I have spent a couple of hours trying to figure this one out, but no luck.



I want to use anchor nut K1100 ( http://www.aircraftspruce.com/pdf/2008Individual/Cat08086.pdf  ) with machine screws NAS514 ( http://www.aircraftspruce.com/pdf/2008Individual/Cat08093.pdf ).

I want to dimple the part where the anchor nut will be riveted, so the screw will sit flush. Dimple die sets are sold for screws #6, #8 and #10 (for instance:  http://www.averytools.com/p-858-screw-dimplers.aspx )



Question is, what the the size of the NAS514P832-6P screw?



(in case this is of use to other listers, here are some related URLs: 

Screw data:

[url=http://icrank.com/cgi-bin/pageman/pageout.cgi?path=/data/screw/screw_source.htm&t ]http://icrank.com/cgi-bin/pageman/pageout.cgi?path=/data/screw/screw_source.htm&t [/url]



Screw dimensions: 

http://www.mcfeelys.com/tech/dimensions.aspx



Wikipedia:

http://en.wikipedia.org/wiki/Screw )



 Thanks in advance for any clues, tips, even shrugs!



Carlos

CH601-HD, plans

  [quote][b]

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dredmoody(at)cox.net
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Posted: Mon Nov 12, 2007 9:13 pm Post subject: what size screw??

No tsure exactly what you are asking about the size  of the NAS514P832-6P screw, so here is the whole deal:

  

 It is a #8 screw. It has 32 pitch threads so it  fits a K1000-08 or any nutplate made for an 8-32 screw. It is 3/8" long (.375").  It requires a #8 dimple to fit flush.

  

 Dred

 [quote]   ---

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carlossa52(at)gmail.com
Guest

Posted: Tue Nov 13, 2007 8:09 am Post subject: what size screw??

Dred, you did answer my question (it is a #8 screw) - thanks much !



The precise piece of information I was looking for, I found in Wikipedia (right under my nose, but I guess my brain was already sleeping when I posted my note last night): 



"Machine screws are described as 0-80, 2-56, 3-48, 4-40, 5-40, 6-32, 8-32, 10-32, 10-24, etc. up to size 16. The first number can be translated to a diameter, the second is the number of threads per inch. There is a coarse thread and a fine thread for each size, the fine thread being preferred in thin materials or when its slightly greater strength is desired. 

The numbering system follows a roughly logarithmic series where an increase in each screw number size approximately doubles the tensile strength of the screw and is given by Dia = (#N X .013") + .060" Using this formula a #5 screw has a major diameter of .125" (1/8"), a #10 screw has a diameter of .190" (or 3/16" in practical terms), etc. The formula applies for screw thread numbers #0 and higher, but does NOT apply to smaller Unified miniature screw thread series. Typically screws smaller than size #0 are supplied in the Unified Miniature Series. The formula for number sizes smaller than size #0 is given by Dia = .060" - (#zerosize X .013). So a #00 screw is .047" dia, #000 is .034" dia, etc. 

The number series of machine screws once included odd numbers (7, 9, etc.) and extended up to #16 or more. Standardization efforts in the late 19th and the early part of the 20th century reduced the range of sizes considerably. Now, it is less common to see machine screws larger than #14, or odd number sizes other than #1, #3 and #5. Even though #14 and #16 screws are still available, they are not as common as sizes #0 through #12. 

Sizes 1/4" diameter and larger are designated as 1/4"-20, 1/4"-28, etc. the first number giving the diameter in inches and the second number being threads per inch. Most thread sizes are available in UNC or UC (Unified Coarse Thread, example 1/4"-20) or UNF or UF (Unified Fine Thread, example 1/4"-2."------------------



Carlos



On 13/11/2007, Edward Moody II < dredmoody(at)cox.net (dredmoody(at)cox.net)> wrote:[quote]       No tsure exactly what you are asking about the size  of the NAS514P832-6P screw, so here is the whole deal:

  

 It is a #8 screw. It has 32 pitch threads so it  fits a K1000-08 or any nutplate made for an 8-32 screw. It is 3/8" long (.375").  It requires a #8 dimple to fit flush.

  

 Dred



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