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Truss rod length

I am going to order a truss rod for my guitar project. If you have used a truss rod, what length did you use?

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Permalink Reply by BrianQ. on January 5, 2023 at 7:52am

Have you tried searching the site for info? The Search box is located at the top right of the page?

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Permalink Reply by BrianQ. on January 5, 2023 at 8:13am

If you want adequate answers, then you’ll have to include some more info? Scale length, number of strings, wood type, Etc. Otherwise, it’s a shot in the dark & you’ll get conflicting information?

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Permalink Reply by Engblom on January 5, 2023 at 11:16am

I will have 4 strings and I have planned to use a scale length somewhere between 600mm and 630mm and at least 19 frets, maybe even 20 frets.

I am looking at ebay and there seems to be some standard lengths for truss rods.

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Permalink Reply by Taffy Evans on January 5, 2023 at 11:05am

Hi, there are four or five or more different reinforcing methods/materials that can be used in a neck, and advising you what to use is hard, as Brian has mentioned already there are a few factors that would guide your decision.
If I was to tell you what rod I would use it could be misleading without any whys and wherefores. The types…

• Good neck wood, grain orientation, and fingerboard material is a good start. Traditionally classical nylon guitars do not have a truss rod in the neck.
• Depending on the number of strings I have used a simple hardwood bar inserted into a neck
• Simple carbon fiber bars can be used in the same manner.
• Solid metal bar sized to suit the number of strings. In my early 6 stringers, I used ¼” x ½” flat bar.
• Single rod, fixed on one end and a nut on the other. Needs to be fitted into a curve in the neck. Works one way
• Single rod in aluminum U channel. Installed flat. Works one way.
• Two-rod system, one end welded Works one way
• Two-way system, the rod is welded on both ends using a rod and a flat bar combination. Moves neck up or down.

I’ll leave you to decide which end to put the adjusting nut, peghead or heal, and what type of nut you want. I fit my rods in different ways in the neck. But as a guide only… adjusting at the heal end {inside the body] start the rod at around the first fret.

If adjusting at the peghead start your rod about 2” from the heel end. How deep into the neck I suppose it will depend on neck dimensions. But I cover my rod with a timber fillet and then the fingerboard.
Now you have the basics you can plan your own best method.
Good luck Taff