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Abusaleem
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Join Date: Feb 2009
Posts: 31

Stud Bolts and Nuts

02/01/2010 3:11 PM

Regarding the nuts for the studs, normally they use the nominal size as M12, M16, M24, ... what is these numbers 12, 16, 24 ... indicate to what?, most of the handbooks their tables by inch or mm, which is not indicating to the above numbers, actually Iam looking for the nuts diameter according to the above numbers, also I try to found ANSI B 18.2.1 & B 18.2.2 but I couldnt found it, if any one have it pls send it to me.
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Just an Engineer
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Join Date: Feb 2008
Location: Australia
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#1

Re: Stud Bolts & Nuts

02/01/2010 3:43 PM

Welcome to CR4.

The numbers refer to the "size" of the threaded part in such a way that M12 represents a 12mm diameter threaded portion.

Welcome to the mixed up world of threads and fasteners. There are multiple "systems" in use and it seems that your first contact was with a system based on AF that if I've got it right stood for "across flats" meaning the size across the flats of the nut used.

For metric threads (Or at least all the one's that I've come across.) the size is the nominal outside diameter of the male thread.

As for those standards you quoted, they look more like paragraph references in what might be a differently numbered standard.

Hope this has helped.

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nikhil175
Participant

Join Date: Jan 2010
Posts: 2
#2

Re: Stud Bolts and Nuts

02/02/2010 5:07 AM

Studs are external threaded and normally they have threads on both ends. Regarding M12,M16, M24 etc., these Alphabets indicate that they belong to Metric Group of Threads with a flank angle of 60 degrees where as BSW indicates British Standard Whitworth Threads and these threads have a flank angle of 55 degrees. What has to be done is :Find out thru thread pitch gauge whether your stud has either Metric or BSW. This can be checked visually and you can count the threads per inch and record it.When you know that it is Metric, measure the external diameter which will be normally less by 0.15 mm from 8,10,12,14,16 ,18,20.22,24 mm etc.,From your figures it indicates that it is metric and you have to refer ANSI B 18 2.4.1,2,3 M1979.This gives details of all nuts.Pls refer American Machinery's Hand Book, pages 1468 to 1472 for matching nuts for Metric.

P.Gangadharan

E Mail Id: nikhil175 @gmail.com
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Anonymous Poster
#3

Re: Stud Bolts and Nuts

02/02/2010 8:44 AM

Just google "metric fasteners" and you will get all the data you need. One of the better ones I have seen is in Maryland metrics.
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Abusaleem
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Join Date: Feb 2009
Posts: 31
#4

Re: Stud Bolts and Nuts

02/02/2010 2:07 PM

THANKS ALL I GOT IT
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Anonymous Poster
#5

Re: Stud Bolts and Nuts

02/03/2010 3:36 AM

Dear Friend:

They indicate the Diameter of the bolt of the threaded ones.
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Anonymous Poster
#6

BSW

07/26/2010 2:53 PM

Please, I need to learn about BSW, someone can help me with this?
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Previous in Forum: What is Impeller CBM?   Next in Forum: What Final Drive is Better for Motorcycles: Chain, Belt or Spiral Gears?
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