Torque

[Sebastian]

Hello Eric.
I am curious about your take on torqueing bolts and nuts.
There are as many opinions out there as there are bolts.

But I would apreciate your take on it.

My personal opinion is that anything that moves should be lubricated (basically everything).
That includes bolts and nuts of course.

Never tought to much about it before, I have always used a drop of oil on bolts before torqueing and never had any problems.
The other day I torqued a bearing holder for a pump, not having oil nearby I used some grease.
When I torqued it to about 10 nm (newtons) I just tought that I should click soon, couldnt finish that tought before the whole thing cracked.

Thats why I started to think about the subject. Some say torque values are for dry/clean bolts and that they shall not be oiled/greased and so on, also read that oil does nothing while grease on the other hand increases the torque with as much as 70%.

Sorry for the long post, in conclusion, I just want to know what you think about it when you work with cars and so on.
And thank you for your awesome videos.

Regards, Sebastian.

Topic

[Ingvar]

[i]• Most standard torque values are based on non-lubricated fasteners.
• Lubricated means coated with a lubricant such as engine oil, thread sealant or thread locker.
• Torque should be reduced appropriately when using anti seize with fasteners where the original torque design did not use anti-seize.
• The nominal torque values listed for Grade 5 & 8 fasteners are based on 75%, of the minimum proof load specified.
• Zinc and copper based anti-seize lubricants are not recommended for use with stainless steels[/i]

http://www.engineersedge.com/material_science/antiseize_compound_application_review_13389.htm

http://www.henkelna.com/us/content_data/333994_LT6734.pdf

[zero]

To simplify what u/ukrkoz posted, If the service manual says to oil or lubricate and torque, then do so. If not assume it’s a dry torque.

[Daniel]

Don’t lubricate bolts. There is no point. You’re just setting yourself up for failure (much like you experienced).

[Sebastian]

Interesting stuff. Thanks alot for the replys. Stay dirty friends 😉

[Daniel]

Just so you know; it is pointless to use a torque wrench if you’re lubing the bolts cause you will never get an accurate reading. This is not an opinion, it is a fact stated by the engineers who design the vehicles and fasteners.

[Author]

Replies