Thread A or B

Technical Communication Technical Documentation
1

Hello everyone,

 

I have a question about the cylindrical "GAS" threads.

I see on the supplier documentation of different components the letter "A" or "B" noted just after the size of the thread as for example:

 

DN 63: G 1/4 B 
DN 100, 160: G 1/2 B

 

This is in fact the tolerance of the thread (the B = 2x A) and any negative values.

 

However, I wonder if it is useful to specify this tolerance on the taps that will accommodate these components?

 

Thank you and have a good day everyone.

2

Hello

 

With us, we never specify tolerance!

3 Likes
3

Me neither, never specified and never in trouble.

 

Just like I don't specify for metric taps: SolidWorks offers a "6g" tap adjustment that I systematically remove.

3 Likes
4

same as the 2 previous answers

no tolerance for cylindrical GAS  pitch...... (whitworth-BSP)

@+ ;-)

1 Like
5

Thank you for your answers! 

So I wouldn't indicate A or B!

 

Whitworth ISO 228-1 thread (DIN 259, BSPP) Pressure angle 55° I would even say ;)

6

@ BATCH123

put an answer in solved if this solved your problem

Thank you

@+ ;-)

7

no tolerance on the rating because  in the cartridge we will say that there is a general ISO tolerance .... xxxx ..... so no need to note on the thread

8

Hello

 

ISO 2768 takes into account threads?

 

Thank you