Guitar Setup Tools

StewMac · Radius gauges

StewMac Standard Understring Radius Gauges, Set of 9

Nine StewMac understring radius gauges fanned out by their handles.
Nine StewMac understring radius gauges fanned out by their handles.

When to choose it

Choose this set when you maintain instruments with several fretboard or string radii. It includes intermediate values absent from the four-piece set, so check the exact radius on each instrument before deciding which set covers your work.

The listed span is 2⅝ inches. If the instrument uses a wider string array, compare the extra-wide variant, which changes reach even if the radius markings are similar.

Specifications

Brand
StewMac
Measurement or fit
Nine radii, up to 2⅝-inch span
Setup task
Check radius or saddle arc
Model
0353
Radii
7.25, 9.5, 10, 12, 14, 15, 16, 17 and 20 inches
Maximum span
2⅝ inches
Count
9 gauges
Variant
Standard width
Amazon.com reference
B01HUCLDZ6

Care and other choices

Review the listed scale and hardware fit ↑

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Documentation

Questions about this product

What does this add over the four-gauge set?

It adds five radius values. The standard-width format remains the same.

Can I use it on a wider bass bridge?

Compare the measured spread to the stated maximum and choose the extra-wide set if you need more span.

What surface should I compare?

Use the gauge edge and reference surface specified for your setup check.

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