All items produced off shore of the USA are considered metric. Is your tremolo Metric or an Imperial (USA) product?Ĭhances are it’s imported to the USA and in a metric format. What is the thread pitch of the arm hole? 250”.Īssuming you have no clue what type of arm you need, here are the questions you need to answer: The butt end can be either square or rounded, threaded or grooved. The unbent rod can be anywhere between 7.5 inches and 8.5 overall for guitar tremolos and up to 12” for bass tremolos. The arm is bent inward toward the center of the guitar depending if the arm is for right handed or left. The second bend usually comes about two thirds way down the arm and is generally about 8 degrees inward depending on design.
It’s all in the design of the tremolo system and its requirements. You will need more dive room for the arm tip, so the angle is less than 90 and can be as low as 75 degrees depending on the spring pull below. Starting at the butt end, the first bend is about ½” to ¾” above the tremolo and is the bend that angles the arm down toward the headstock. The arm design is simple generally arms have 2 bends in them but can have more if needed for a purpose. The arm is used to actuate the tremolo device in order to raise/ lower the pitch of the strings.
“Tremolo” arms or “Whammy” bars as they’re sometimes called, are used with a “Tremolo” (the correct term is actually Vibrato) but that is another argument all together.
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