What is Thread Galling?

Motofool · October 27th, 2015, 06:57 PM

"Thread galling occurs during installation when pressure and friction cause bolt threads to seize to the threads of a nut or tapped hole. It is also known as "cold welding".

Once a fastener has seized up from galling it is typically impossible to remove without cutting the bolt or splitting the nut.
.........
Stainless, aluminum, and titanium fasteners form thin protective oxide films on their exposed surfaces that prevent corrosion. In addition, this coating reduces friction and prevents direct metal to metal contact during fastening.

The protective oxide film can be rubbed or scraped off under the pressure and movement of the fastener being tightened. When this happens these relatively soft metals come into direct contact. Friction increases and the chance of galling increases significantly."

Read full article here:
https://www.boltdepot.com/fastener-i...d-galling.aspx

Jasonm163 · October 28th, 2015, 05:54 PM

Very good. Many younger members without much mechanical background may not have understood this concept. I like these posts you make.

Kevin1956 · October 28th, 2015, 10:33 PM

Cheap precaution, about $12.00 a can from a good auto parts store. Apply it to the threads with the included brush. Marine grade is also available from boating supply shops, which would be preferable if your bike is exposed to wet weather a lot.

spooph · October 29th, 2015, 07:47 AM

and good remediation if precautions weren't taken:

http://www.sears.com/tekton-7-pc-3-8...=SPM2092158803

Motofool · October 29th, 2015, 08:30 AM

Quote:

Originally Posted by Jasonm163

Very good. Many younger members without much mechanical background may not have understood this concept. I like these posts you make.

When I was very young, I learned from experienced mechanics to torque slowly while feeling what the metal was doing.
I did not understand the concept of avoiding over-heating or over-torquing at that time, but it saved me many headaches while I had no torque wrench.

Thank you

FrugalNinja250 · October 29th, 2015, 10:39 AM

Remember, when using anti-seize compounds you must reduce the tightening torque or you will risk breaking bolts or stripping threads. Anti-seize compounds allow much more tension in a bolt for a given amount of torque. There should be charts on google that say how much to reduce torque.

adouglas · November 11th, 2015, 08:00 AM

Thread galling is when someone really pisses you off in a discussion on the Interwebz and you just plain lose it.

October 27th, 2015, 06:57 PM	#1
Motofool Daily Ninjette rider Name: Hernan Location: Florida Join Date: Mar 2011 Motorcycle(s): 2007 Ninja 250 Posts: A lot. MOTY - 2016, MOTM - Dec '12, Jan '14, Jan '15, May '16	What is Thread Galling? "Thread galling occurs during installation when pressure and friction cause bolt threads to seize to the threads of a nut or tapped hole. It is also known as "cold welding". Once a fastener has seized up from galling it is typically impossible to remove without cutting the bolt or splitting the nut. ......... Stainless, aluminum, and titanium fasteners form thin protective oxide films on their exposed surfaces that prevent corrosion. In addition, this coating reduces friction and prevents direct metal to metal contact during fastening. The protective oxide film can be rubbed or scraped off under the pressure and movement of the fastener being tightened. When this happens these relatively soft metals come into direct contact. Friction increases and the chance of galling increases significantly." Read full article here: https://www.boltdepot.com/fastener-i...d-galling.aspx __________________________________________________ *Motofool* *.................................Never ride faster than your guardian angel can fly* "Mankind is composed of two sorts of men — those who love and create, and those who hate and destroy. Love is the bond between men, the way to teach and the center of the world." - José Martí
	3 out of 3 members found this post helpful.

October 29th, 2015, 07:47 AM	#4
spooph ninjette.org certified postwhore Name: Spooph Location: Golden, CO Join Date: Jul 2010 Motorcycle(s): '08 Ninja 250R Posts: A lot. MOTM - Oct '15	and good remediation if precautions weren't taken: http://www.sears.com/tekton-7-pc-3-8...=SPM2092158803 __________________________________________________ My therapist has 2 wheels and a seat. If you are ever in doubt to my tone, please refer to my avatar.
	1 out of 1 members found this post helpful.

October 29th, 2015, 10:39 AM	#6
FrugalNinja250 ninjette.org certified postwhore Name: Frugal Location: Dallas/Fort Worth (DFW) Join Date: Mar 2010 Motorcycle(s): Several Posts: A lot.	Remember, when using anti-seize compounds you must reduce the tightening torque or you will risk breaking bolts or stripping threads. Anti-seize compounds allow much more tension in a bolt for a given amount of torque. There should be charts on google that say how much to reduce torque.
	2 out of 2 members found this post helpful.

November 11th, 2015, 08:00 AM	#7
adouglas Cat herder Name: Gort Location: A secret lair which, being secret, has an undisclosed location Join Date: May 2009 Motorcycle(s): Aprilia RS660 Posts: A lot. Blog Entries: 6 MOTM - Jul '18, Nov '16, Aug '14, May '13	Thread galling is when someone really pisses you off in a discussion on the Interwebz and you just plain lose it. __________________________________________________ I am NOT an adrenaline junkie, I'm a skill junkie. - csmith12 Nam et ipsa scientia potestas est. Heri historia. Cras mysterium. Hodie donum est. Carpe diem.
	1 out of 1 members found this post helpful.

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October 28th, 2015, 05:54 PM	#2
Jasonm163 ninjette.org member Name: Jason Location: Tyler Join Date: Jul 2015 Motorcycle(s): 2015 Ninja 300 ABS Posts: 56	Very good. Many younger members without much mechanical background may not have understood this concept. I like these posts you make.