It’s usually stamped on the head of the fastener (eg. 4.9 or 8.8 or 10.9 or 12.9); can be very small and hard to read so good light, reading glasses, magnifying glass, etc. is a must
I'm not sure what your question means. The minimum tightening torque would be driven by the preload requirements of the application, but assuming you have a reasonably accurate torque wrench, torquing to the maximum tightening will not damage the fastener. It might damage the surrounding member though, such as if it was constructed of carbon fiber.
I'm not quite sure what you mean. My simple formula gives maximum tightening torques very similar to the values given by Bossard which are based on VDI 2230, edition 2015. See www.vdi2230.de for more info on VDI 2230. Naturally do not use my method for safety-critical applications.
In sizes M8 through M24, tightening torque for fine-pitch versions is around 4% to 12% higher.... but it depends on which fine-pitch version among other factors.
No, not as long as there is adequate thread engagement. A rough rule of thumb is that there should be at least one diameter's length of thread engagement.
The recommended torque in the table that I show in the video is 5.15 Nm. Using my formula results in 5.19 Nm, less than a 1% difference. Not sure where you got the 3.9 Nm from. As always, follow the manufacturer's torque recommendations.
Lol just add a magic dive by 11 and voila! How do you get your magic 11 figure. And how is 1002 representing the table value 1304? That is way off.. I have no idea what your video is trying to show..
I demonstrated that the method is reasonably accurate, even for extreme cases. 1,002 Nm vs 1,305 Nm is only a 23% error. And that's for an 3.6 M42 screw.
Very useful and reasonably accurate. Thanks for figuring it out and posting it.
Truly appreciate the video. Always wanted to know this information and now it has been stamped in my brains.
After roaming all over TH-cam I find a useful video about this topic
thank you so much. but how to know the grade\class of the fastener? is it by the color?
It’s usually stamped on the head of the fastener (eg. 4.9 or 8.8 or 10.9 or 12.9); can be very small and hard to read so good light, reading glasses, magnifying glass, etc. is a must
Is there a table like that for hex head bolts with numbers marked on the heads?
Saya hairan, kiraan didapat dari rumus yang anda berikan berbeda dengan apa yang tertulis. Apakah ini bisa dibilang akurat? TQ.
Minimum tightening torque calculation method please
I'm not sure what your question means. The minimum tightening torque would be driven by the preload requirements of the application, but assuming you have a reasonably accurate torque wrench, torquing to the maximum tightening will not damage the fastener. It might damage the surrounding member though, such as if it was constructed of carbon fiber.
Very useful ❤
Very helpful thank you
Can u please share the design code of the given formula?
I'm not quite sure what you mean. My simple formula gives maximum tightening torques very similar to the values given by Bossard which are based on VDI 2230, edition 2015. See www.vdi2230.de for more info on VDI 2230. Naturally do not use my method for safety-critical applications.
what is 11
Does this metric coarse thread table suitable used on screws?
I'm not sure I understand your question. The figures are for metric coarse thread. The company Bossard has the best torque charts that I have found.
How pitch will depend with this formula
In sizes M8 through M24, tightening torque for fine-pitch versions is around 4% to 12% higher.... but it depends on which fine-pitch version among other factors.
that's dont even close if you want pressision go with the bolt maker recommendations
The results are extremely close to standard torque table values.
But how about bolts lenght? Does it matter?
No, not as long as there is adequate thread engagement. A rough rule of thumb is that there should be at least one diameter's length of thread engagement.
By 11 means
Nice
thread pitch and length matters
If i apply this torque value on my dual crown fork id be long dead😂😂😂
Imagine tightening all 7 m4 bolts at only 3.9Nm in the 12.9 class index😂😂😂
The recommended torque in the table that I show in the video is 5.15 Nm. Using my formula results in 5.19 Nm, less than a 1% difference. Not sure where you got the 3.9 Nm from. As always, follow the manufacturer's torque recommendations.
Nice
How about standard bolt
I think the values should be the same, but as always, consult a proper table to verify.
Lol just add a magic dive by 11 and voila! How do you get your magic 11 figure. And how is 1002 representing the table value 1304? That is way off.. I have no idea what your video is trying to show..
I demonstrated that the method is reasonably accurate, even for extreme cases. 1,002 Nm vs 1,305 Nm is only a 23% error. And that's for an 3.6 M42 screw.