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  #1  
Old 02-18-2019, 06:00 PM
Quickstep192 Quickstep192 is offline
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Default Difference between dual action and two way truss rod

I'm shopping for a truss rod and noticed that Bitterroot has ones called dual action and others called two way. What's the difference?

https://www.bitterrootguitars.com/Tr...-16-s/1920.htm
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Old 02-18-2019, 08:09 PM
mirwa mirwa is offline
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I make my own truss rods, so my terms, Dual action means to me, both ends have threads that are moving. Two way is fixed at one end and threaded at the other.

A dual action is a two way truss rod but a two way truss rod is not dual action, the key word "action"

Steve
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Old 02-19-2019, 11:29 AM
John Arnold John Arnold is offline
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Looks like their 'two way' rods have a captured nut, so they will adjust in both directions. I believe that is the same as the Martin design.
With their 'dual action' truss rod, the rod that the adjusting nut is attached to turns when you adjust it. Some of this type have left-hand threads on one end, and some have a finer thread pitch. The ones with the fine/coarse threads adjust much more slowly, and are easier to fine-tune when adjusting neck relief.
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Old 02-19-2019, 12:02 PM
Quickstep192 Quickstep192 is offline
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Does the Martin truss rod that StewMac adjust both ways?

This one


https://www.stewmac.com/Materials_an...Truss_Rod.html
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Old 02-19-2019, 12:10 PM
JonWint JonWint is offline
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No. Description:

"Strong aluminum one-way truss rod, similar to the design used by Martin for many years."
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  #6  
Old 02-20-2019, 08:06 AM
John Arnold John Arnold is offline
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Martin changed to a two-way rod when they experienced some back-bow on the necks with Richlite or Micarta fingerboards. I have never had that issue, so I tend to stick with one-way rods. IMHO, they are easier to work with.
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