how to calculate bolt tightening torque
ฝัง
- เผยแพร่เมื่อ 16 ส.ค. 2024
- How to calculate bolt tightening torque.
By applying tightening torque, we are basically stretching the bolt. which in turns creates a tensile stress in the bolt.
The tensile load developed in the bolt due to tightening torque is known as preload. The tensile load in the bolt, creates a compressive force in the bolted joint. which is often known as clamping force.
When we apply tightening torque to a bolt, it seems that all applied torque converts into preload. But unfortunately only 10% of the applied torque convert into useful preload.
And about 50% of the applied torque is used to counter, frictional resistance between the nut and the washer or nut and joint.
And remaining 40% of the applied torque is used to counter frictional restraint between threads of nut and bolt.
The tightening torque also depends on the nut factor K.
The value of nut factor depends on Fastener Materials, type of Coatings and lubricant.
if we load the bolt up to its yield point. Than bolt will have permanent deformation and it cannot be used again. So in case of fasteners we define a term proof strength or proof load.
Proof strength can be defined as the maximum tensile stress that can be applied to a bolt, which will not result in plastic deformation. In other words, the material must remain in its elastic region when loaded up to its proof strength. Proof strength is typically between 85 to 95% of the yield strength.
In case of non-permanent bolted joint, where we want to reuse bolts. In such applications bolt should be loaded up to 75% of its proof strength, this is to avoid permanent deformation in bolt.
So for non-permanent bolted joint preload can be calculated as 0.75 times proof strength multiplied by bolt stress area.
And if the bolted joint is permanent, then we can load the bolt up to 90% of its proof strength. Therefore, in case of permanent bolted joint preload can be calculated as 0.90 times proof strength multiplied by bolt stress area.
Some of queries answered in this video are
how to calculate bolt tightening torque 0:29 to 4:30
how to calculate tightening torque of a bolt
torque calculation for bolts
how to calculate tightening torque of a screw
how to calculate tightening torque for bolts
torque calculation for fasteners
tightening torque calculation for bolts
fastener torque calculation
bolt torque calculation
bolt tightening torque calculation 0:29 to 4:30
How to calculate bolt torque
tightening torque calculation for fastener
bolt tightening torque
bolt tightening torque calculation
bolt tightening
bolt tightening torque formula
bolt tightening sequence
bolt torque
bolt torque chart
bolt torque calculation formula
screw torque
screw tightening
#bolt tightening torque calculation
#bolt tightening torque
#bolt torque calculation
you may also like to watch following videos
Bolt grade explained watch this- • Bolt grade explained
screw thread terminology and bolt specification explained watch this- • types of screw threads...
proof load and offset yield strength watch this • Proof Load and Yield S...
coarse pitch vs fine pitch screw threads. A guide for screw pitch selection watch this - • How to Choose the Righ...
application of specicific speed watch this- • Unlocking Pump Efficie...
pump cavitation and net positive suction head watch this- • pump cavitation and ne...
How to select pump speed: A complete guide as per Hydraulic Institute standards watch this- • Unlock Maximum Efficie...
Download spredsheed for tightening torque docs.google.co...
Nice. Short, informative and clear. Thank you!
Pls do an example calculation also, to verify wether viewer will be doing correctly or not.
Presentation is really very good 👍
Thansk for a very good and detailed explanation. I appreciate if you could share where you get the tables.
The presentation is quite amazing. If possible.. please focus on improving voice quality. Waiting for your next video ! : )👍👍👍
Thanks for your valuable feedback
Very good explanation. Greetings from Brazil...
Please make more videos like this which can be useful for mechanical engineers
Download spredsheed for tightening torque click following link.
docs.google.com/spreadsheets/d/1SplyfYS25ulU_HBBnu1mhDRl1yrFa0Hc/edit?usp=sharing&ouid=104394080873650819842&rtpof=true&sd=true
cant access this link
Spreadsheet was deleted?
It doesnt work anymore
Thanks for such a wonderful video.. presentation and animation is really nice.
Thanks mohit
Thanks it is a great explanation.
thanks a lot Dear good explanation May i know in which code you use as reference for table
How many no of thread need to be outside after bolt, after full tightening? Which stander deal with it
good explanation bravo.May i know in which code you use as reference .
You sir is a genius.
dividing by 1000 is to convert mm to meters, this step is not needed if you keep your input values the same as the output values i.e. Newtons and meters, otherwise very good
This is an excellent explanation. Could you add links in the description to the tables used in the video?
let me know which table just mention time. I will give you the reference
@@technoworks. I think he's talking about the table at 1:35. Thank you!
Hi Rohit, if you are asking about K table then it has been derived from a book "John H. Bickford -An introduction to the design and behavior of bolted joints". This you can see at the top side of PDF at 1:35. time into the video. You need to closely observe it 😊.
good presentation....what the difference between non permanent bolted joints vs permanent bolted joints ? thx..
standard screws and bolts can be detachable but there are fasteners used in aerospace industry like hi-lok, hi-lite. these fasteners are also threaded. but they can not detachable after installation.
Can you please share the nut fator pdf and the spreessheet ?
Nice presentation
Reupload the spreadsheet please? Thanks for great video.
Nice vide, thanks. In minute 4 which standard you follow?
Sir plz show us real calculation on bolt..I love this make more vedios
Very useful video 👌🏻
Can you please tell me that if screw connection loaded by 22kN force and coefficient of friction for dry Surface is 0.16
Then which screw size is suitable like M10 or M12 ???
Why 0.938 is deducting from Pitch during stress area calculation of bolt? Please explain.
Hi, thanks for great video, explanations are very clear. Could you please tell from where u took the reference for pre load calculation. 0.75% of proof strength for non permanent joint is there any iso standard?? Currently i am checking for A4 70 grade bolt, there proof strength is mentioned as stress at 0.2 permanent strain is it correct? References for the formulas would be really helpful.
Thanks
material which doesn't exhibit a clear yield point, for those materials proof strength is often considered as stress corresponding to 0.2% of permanent strain. some time it is also expressed as offset yield strength or 0.2 yield strength.
It is standard engineering practice. You will find it any fastener handbook.
Thanks for the response 🙂.. for 75% is there any references??
For 8.8 grade bolt proof stress and stress corresponding to 0.2strain both are available in iso standard. Value is 600 and 640 respectively so i am getting the doubt whether stress at 0.2 yield is Same as proof stress?
Without the reference i am unable to derive the conclusion that's the reason.
Thanks
Read preload joint analysis methodology for space flights by NASA. also refer a book "intoduction to the design and behavior of bolted joints"
Also refer this video th-cam.com/video/-_BxnhLyuH8/w-d-xo.html
Brother, How to calculate threatened length using clamping force
Sir please calculate 20mm Dia Bolt ( F ) Value. Pitch 2.5m / Gr. 8.8
If possible please calculate Minimum / maximum torque in Nm.
M20 Bolt. / Gr. 8.8 / Pitch 2.5m / K= 0.15 / 600 Mpa.
We use this bolt in Railway Bridges. This is a High strength friction grip Bolt.
Can you please tell me the book from which you take this content? Thanks in advance
How do you calculate the required torque when you are tightening a material like rubber? Like a flat rubber seal being tightened with bolts against a metal surface
Use Shigley approach where you check for stiffness of bolt and clamped parts
great man
Can you please explain how to calculate force which will make the bolt pull out of the nut
Failing its threads!
For standard bolt, VDI 2230 or machinery handbook I think is good to go. For customized thread, it can be treated as beam theory, where beam section height is thickness of root thread and beam section width is the thread coil length.
Your explanation is good
Can u pls provide information where did u get all the reference paper
Its a general engineering practice. You may refer engineering handbooks and standards on fasteners.
Excellent
Thanks
Why can't we have magnetic bolts and nuts?
what could be torque vlvue for nut size30x2.00
first let me know the bolt grade. if we consider 4.8 grade , torque will be 1040 NM
How to get nut factor pdf or that table
👍👍👍👍👍
Sir, where did you get the forumla especially on the factor for the Pitch?
Available in fastener handbooks
@@technoworks. the 0.9something?
Area formula is wrong, It should be = Pi/4 * ((D- (.9742/pitch))^2
my customer is calculating clamping load , can you tell me how can i calculate clamping load for M16 12.9 class bolt with M16 nut
For class 12.9 M16 bolt, tightining torque should be about 365 N-m. Assumed K=0.2 for non plated steel bolts and proof strength = 970 N/mm2.
What language your cast speaks?
👌
Sound not clear.
Thodasa volume badavo yaar
Nach fest kommt ab!
Audio quality is bad
your voice can barely be heard, otherwise good work.
audio is very bad.
My apologies
Ur voice is toooooo looooow
For the kind of knowledge you're trying to lend it's terrible quality audio.
Apologies.
Speak loudly Siiiiiirrrrrrrrrrrrrrrrrrr
Your English is hard to understand
It wasn't fast.
Y
Does it really matter for Engg solution. Muslim No. Muslim. Btw. Wow explanation. Kammal
Why Hindu muslim discrimination in the comment section, just be worried about engineering Solutions
Are you afraid of Muslims? I just asked a question as others ask sometimes. If you don't want to answer, that's fine. For me, Hindu or Muslim does not matter. Must be human. Good luck@@nasir97uet
@@sharathp3809
Are you afraid of Muslims? I just asked a question as others ask sometimes. If you don't want to answer, that's fine. For me, Hindu or Muslim does not matter. Must be human. Good luck
try to speak english, can't understand one word you are saying.
👍👍👍