taps to rethread top yoke and head for 68 commando

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Hi All.
Please, i need to buy the taps to rethreadh, for my '68 commando:
-the fork top yoke to fix the handlebar clamp cap allen screws (items n. 06.0333).
I know the threadh that is 5/16" UNF but not the tips;
-the head to fix the the allen screws inlet manifolds (items n. 14.7019).

Thank you.
Piero
 

L.A.B.

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-the fork top yoke to fix the handlebar clamp cap allen screws (items n. 06.0333).
I know the threadh that is 5/16" UNF...
Yes.

but not the tips;

Tips?

-the head to fix the the allen screws inlet manifolds (items n. 14.7019).

1968 Commando Allen screws should be 5/16" Whitworth NM23412/06.7849, (7/32" Allen key size) therefore, the thread is the same.
Item 29:
 
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Yes.



Tips?



1968 Commando Allen screws should be 5/16" Whitworth NM23412/06.7849, (7/32" Allen key size) therefore, the thread is the same.
Item 29:
Hi Les.
Sorry, for tips i meant the number like 5/16 x"26".
I thought that 26 were the tips.
Thanks.
Piero
 

L.A.B.

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Aren't the manifold screws 5/16-18 UNF?
I'm sure you mean UNC.
The manifold screw part number did change (as it increased in length from 3/4" to 7/8") but the thread seems to have remained Whitworth although UNC screws are often substituted.
My Mk3 still had the Whitworth screws with the 7/32" Allen key sockets, not UNC 1/4".
 
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I'm sure you mean UNC.
The manifold screw part number did change (as it increased in length from 3/4" to 7/8") but the thread seems to have remained Whitworth although UNC screws are often substituted.
My Mk3 still had the Whitworth screws with the 7/32" Allen key sockets, not UNC 1/4".
Thank you Les,
i have bought 5/16 18 TPI BSW from Tracy Tools.
Please, is the allen CAP SCREW 5/16" BSF x 3/4 (item n. 06.7745), to fix the head steady, of 22 TPI?
Thank youso much.
Piero
 
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5/16 BSF tpi is 22.
Thank you.
Sorry, every time i need to know a threadh i must disturb you fans.
Please, where i can read the measures for all the Commando studs, nuts, screws, etc,?.
Can i find such information on the workshop manual?.
Thank you.
Piero
 
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Thank you.
Sorry, every time i need to know a threadh i must disturb you fans.
Please, where i can read the measures for all the Commando studs, nuts, screws, etc,?.
Can i find such information on the workshop manual?.
Thank you.
Piero
By part number database

 

baz

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Thank you.
Sorry, every time i need to know a threadh i must disturb you fans.
Please, where i can read the measures for all the Commando studs, nuts, screws, etc,?.
Can i find such information on the workshop manual?.
Thank you.
Piero
Don't worry about asking Piero it's always good to ask here first mate !!!
English threads are very confusing
Do you have a thread pitch gage? They are worth having
 

maylar

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I'm sure you mean UNC.
The manifold screw part number did change (as it increased in length from 3/4" to 7/8") but the thread seems to have remained Whitworth although UNC screws are often substituted.
Yes, I meant UNC. I found some stainless 5/16-18 screws at the local hardware store but was dismayed that the hex key was 1/4 rather than 7/32.
 

baz

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Yes, I meant UNC. I found some stainless 5/16-18 screws at the local hardware store but was dismayed that the hex key was 1/4 rather than 7/32.
The correct screws are bsw 55° and take the 7/32 Allen key as far as I can remember
But as lab says the UNC 60° screws often get used
Just be careful not to strip the threads out
 
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