Applied Bolting - Torque isn't Tension

[inafusabi]

Insightfull video.. I learned why the difference between dry and wet torque can be so great. Thank you

[johnfraser]

Great video that addresses an important topic. I just wanted to mention, however, that the elongation of the bolt is essentially the strain. The tension is the force which causes this strain.

[weaesq]

Thank you for this. Interesting how much tension is lost in rust between nut and washer and threads.

[crocha]

Back in the early days, I would regularly hear that certain competitors bolts were better quality than mine. Then a smart man cane along and taught me this. Never lost a deal after on perceived quality

[LTVoyager]

I’ve often wondered why torque values weren’t given for lubricated bolts rather than “clean and dry” which almost never exists in the field.

[markdstump]

Excellent video!!
Yeah, I commented on this video three years ago, but apparently I needed to relearn what it has to say!

[galvanizedgnome]

traps looking good bro. Keep up the hard gym work.

[markdstump]

My 2000 F-250 manual advises me thusly:
On all two-piece flat wheel nuts, apply one drop of motor oil between the flat washer and the nut.
Do not apply motor oil to the wheel nut threads or the wheel stud threads
and...
On vehicles equipped with single rear wheels, retighten the lug nuts to
the specified torque at 800 km (500 miles) after any wheel disturbance
(tire rotation, changing a flat tire, wheel removal, etc.).

[PacoOtis]

Excellent! We definitely owe you a beer!!!

[bignrich]

i feel so special, i made the wingscrews holding the tester to the beam n my dad made the guard around the dial

[GlennHa]

Rob: Excellent explanation.
Please set a good example by wearing safety glasses in all your videos.

[geoh]

My car is 32 years old and I'm more than twice that, so I meet long time lubrication problems, often at the lug bolts. I'm not in socal any more, but soggy eastern NY where they use salt on the roads in the winter.
My lug bolts effectively seize up (only partially, thank God) due to the threads being freed of all lubrication by repeated washings of water, especially at the bolt "cone" juncture with the countersunk holes in the alloy rim. The steel and the alloy do their best at trying to become one with each other at their joining surfaces over the time of one year or more.
The "mechanics" with their air impact weapons can't or won't take the time to assure that the bolts are brushed clean of foreign material, which adds to the problem.
To get to the point, when I detect that there is a problem with the lug bolts at a wheel, I clean off the threads (at least on the bolt) and apply a thin amount of Permatex anti-seize compound (the dreaded "gray stuff" feared by mechanics everywhere) to both the threads and the "cone." The metal particles do a better job of remaining over time than would just plain oil or grease.
Then, I tighten by using a lug wrench and I can feel (judging by the size of the bolt thread [in my case 12 mm]) when I am tightening by elastically stretching the bolt, and not plastically deforming it towards breakage.
I have never had lug bolts loosen, and the anti-seize compound is much better than risking a broken bolt when removing a wheel.

[CAGraphics]

Ive read that when using anti seize, to multiply the recommended torque speck by 0.8, or 80%. What say you??

[anthonyc]

HI - what is the lubricant stick used in the video (Brand and type)

[gullreefclub]

Something that was not mentioned is that too much or the wrong lube on a bolt and nut will also give false torque \ tension

[tomasgimenez]

The moral of the story: Do not expect proper tension when using rusted bolts.

[muratislamceng]

If you lubricate a bolt then you reduce the required torque for a set pre-tension, however, you also greatly increase the chances to break the bolt or the clamped parts. VDI2230 standard advises correct torque calculation and provides achievable pre-tension ranges for bolted joints. Never lubricate a bolt without understanding tension/compression capacities of the joint.

[ckpitt]

i think you'd just be helping it to reach the amount of stretch/preload a fastener of that material and size was rated for. i'd be inclined to say that even if you compared two new bolts, one lubed and one not - you'd reach a higher preload on the lubed one for the same torque. of course if they are torque to yield bolts then its a different story

[BIG_doinks]

I'm not expecting an answer on a 13 year old video, but I'll try anyways.
Will a lubed bolt assembly not have a greater chance of sliding out after a while and lose tension since the threads are lubed?

[gonzalogonzalesmejia]

Buenas noches que marca y modelo es la pistola de torque?