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BA fastener washer dimensions

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Anthony Knights13/01/2012 12:36:39
681 forum posts
260 photos
Just received some mail order 10BA washers which look too big to me.
They have an OD of 4.3mm with a 1.9mm hole. I have trawled the internet and found numerous sites which give thead dimensions, but cannot find spec. for washers. Does anyone know the correct dimensions. Alternatively, where can I get this information without paying BSI a small fortune.
 
Thanks in advance
Tony
The Merry Miller13/01/2012 13:08:38
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484 forum posts
97 photos

Anthony,
 
B.A. washers are supplied as Large or Small.
The outside dia. of 10 BA large is 0.171/0.176"
Hole dia. is .073/0.078"
Thickness is 27swg (0.0164")
 
The reference book I'm looking at now only goes down to 8BA for the small washers.
The above abstract was from BS 57 and it's obvious what you have are large 10 BA washers.
 
Len P.
The Merry Miller13/01/2012 14:30:43
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484 forum posts
97 photos

Just discovered the full BS 51 spec for your edification Anthony.
 
Len. P.
 
 
The Merry Miller13/01/2012 14:49:35
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484 forum posts
97 photos
Posted by The Merry Miller on 13/01/2012 13:08:38:

Anthony,
 
B.A. washers are supplied as Large or Small.
The outside dia. of 10 BA large is 0.171/0.176"
Hole dia. is .073/0.078"
Thickness is 27swg (0.0164")
 
The reference book I'm looking at now only goes down to 8BA for the small washers.
The above abstract was from BS 57 and it's obvious what you have are large 10 BA washers.
 
Len P.
 
Should be BS 51.
Len.
 
Anthony Knights13/01/2012 19:46:20
681 forum posts
260 photos
Thankyou Len. dimensions more or less match the washers I have although they still don't look right when used on my model horizontal engine.
 
Regards
Tony
Stub Mandrel13/01/2012 22:39:34
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4318 forum posts
291 photos
1 articles
Hi Anthony,
 
Very few full size engines have washers under their nuts.
 
Neil
Anthony Knights16/01/2012 00:36:31
681 forum posts
260 photos
Washers would stop me damaging the paint job.
Tony
Anthony Knights16/01/2012 00:39:53
681 forum posts
260 photos
The link I was given for the BA data no longer seems to work. Have I been blocked from accessing this data by some mysterious webmaster?
JasonB16/01/2012 07:36:35
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25215 forum posts
3105 photos
1 articles
Anthony can you get away with brass washers, I noticed yesterday that my 10BA brass ones were quite a bit smaller than the steel ones I have. As far as I know both wer bought from EKP.
 
Link still works for me.
 
J
Anthony Knights16/01/2012 21:00:56
681 forum posts
260 photos
Link works for me again today, so I,ve printed the whole lot in case I lose it again.

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