Hello everybody, Questions: 1 3

[moiz19670309]

Hello everybody,

Questions:

1). What is the maximum tightening torque for brass bolts of M10 size ? I want to

tighten brass bolts on brass earthing bar.

Could you recommend a comprehensive data sheet/table for this purpose ?

Thanks.

 

[XL83NL]

Yes: Bickford.

Please bear in mind this forum is full of experienced and helpful engineers (I'm not experienced in this subject though), but asking such questions sounds like not knowing the theoretical of your question, whereas you're asking someone else to do your homework.

Huub
- You never get what you expect, you only get what you inspect.

 

[moiz19670309]

Sir
I am having this problem at my job. I have to use M10 brass bolts. The manual asks a tightening torque of 40 Newton Meter.
Is this right torque. I have searched the net for Brass bolt torque chart but not found.
Kindly help.

 

[moiz19670309]

 

[rothers]

What grade of Brass for the bolt ?

How much thread engagement and what grade is the brass earthing bar ?

 

[MintJulep]

The formulas you need are here. Sorry, they're biased to imperial units.

https://www.google.com/amp/s/

http://www.engineeringtoolbox.com/amp/bolt-stretching-d_1164.html

You'll need to find the yield stress for your particular flavor of brass, and use your engineering judgement about how close to yield you want to be.

 

[dvd]

If you want to verify that the torque applied is producing the correct amount of tension, you could try the stretch control method outlined on page 13 - Fastenal Bolted Joint Design

 

[LittleInch]

The manual asks a tightening torque of 40 Newton Meter.

Who are we to doubt the manual?

That's what manuals are for....

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[cherish]

Hi, I think the most simple is check for stress of bolt under that torque / preload, and 40N.m seems a bit high for M10 brass bolt:

Engineering is a journey of thousand miles begins with a single step

 

[3DDave]

The fastener in the picture looks to have been hand filed to shape. It doesn't look like it is made of brass.

 

[cherish]

Then torque at 5N.m seems good enough for this bolt (just a guess without knowing more detail the clamped parts & their working condition)

Engineering is a journey of thousand miles begins with a single step

 

[LittleInch]

Having said that the manual must know, it does seem rather high...

Are you sure it is 40 N-m??

Can you post the page from the "manual"

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[Jboggs]

I do not understand the absolute reluctance of so many people to simply call a manufacturer with the same questions they ask random strangers on a forum like this. CALL A BRASS BOLT MANUFACTURER!! They have people there (Application Engineers) that can answer your question. Their only job is to help you succeed with their product. Use them!

 

[cherish]

Hi,

I found a couple of reference recommend torque charts, the one below is simple to read (closest to M10 is 3/8 inch, torque converted to N.m is 22N.m):

https://l-36.com/torque.php

By the way, found this original topic from 2008 in below discussion:

https://cr4.globalspec.com/thread/17485/Tightening-torque-for-brass-bolts

Engineering is a journey of thousand miles begins with a single step