Ba head sizes

This topic has 6 replies, 3 voices, and was last updated 15 July 2011 at 21:31 by Gary Brooke.

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14 July 2011 at 10:59 #71780
Gary Brooke
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@garybrooke63895
Hi another beginner with little knowledge. I have started a model steam engine.to start building skills I have cut out mainframes and strechers now to my ? Is there any standard for BA bolt head thickness in relative to the thread dia

Hope somebody has a clue what aim seeking
Thanks
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14 July 2011 at 10:59 #5583
Gary Brooke
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@garybrooke63895
14 July 2011 at 12:16 #71786
KWIL
Participant
@kwil
Gary,

Look in your messages and you will find all you need, scanned from ME Handbook.

K
14 July 2011 at 12:20 #71787
Roderick Jenkins
Participant
@roderickjenkins93242
According to Wikipedia the hex bolt head is 1.75x the thread diameter. Thus, for 0BA which is 6mm diam. the head is 10.5mm AF. Be aware that many vendors supply bolts with a one size smaller head e.g. 4BA bolt (thread O.D. 3.6mm) witha 5BA head (5.6mm instead of 6.3mm AF). These smaller headed bolts have a better scale approximation to the full size, mostly whitworth bolts, on full size engines.

cheers,

Rod
15 July 2011 at 11:37 #71851
Gary Brooke
Participant
@garybrooke63895
Thank you gentlemen for your prompt reply but i seem to have worded it wrong it was not the AF size but the depth of the head
Kwil I have looked in my messages but there seems to be nothing being new to this game what am I doing wrong
15 July 2011 at 20:37 #71872
Roderick Jenkins
Participant
@roderickjenkins93242
Not you, I didn’t read the question properly. Anyway from the ME Handbook:

Head height:

0BA .17

2 .13

3 .118

4 .101

5 .09

6 .083

7 .073

8 .065

10 .050

12 .038

HTH

Rod
15 July 2011 at 21:31 #71875
Gary Brooke
Participant
@garybrooke63895
Thanks Rod.
Boss of shopping tomorrow so got hole day to make bolts
Regards
Gary
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Ba head sizes

Ba head sizes

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