Fret Saw — Lutherie Encyclopedia

Fret SawType: toolA thin-kerf saw precisely sized to cut fret slots that match the tang width of the fret wire being used.## Description A fret saw is a specialized back saw or flush-cut saw with an extremely thin blade (kerf width typically 0.023 to 0.025 inches or 0.58 to 0.64mm), matched to the tang width of standard fret wire. The blade is stiffened with a rigid spine to prevent flexing during the cut. Depth stops may be built in or added as accessories to ensure consistent slot depth, typically 1.5mm to 2mm. Some fret saws are designed for use with a miter box or slotting jig that indexes to the fret spacing template. ## Use in Lutherie Fret slots must be cut to a precise width and depth in the fretboard for the fret wire tang to press in securely. If the slots are too wide, frets will be loose and may pop out; too narrow and the frets cannot be seated without excessive force, which can crack the fretboard. The fret saw cuts these slots, either freehand using marked lines and a guide, or in a table-saw-style slotting jig. Accurate slot cutting is foundational to good fretwork. ## Selection Guide The most critical specification is the kerf width, which must match your fret wire tang. Measure your fret wire tang with a caliper before purchasing. Stew-Mac, LMI, and Hosco offer fret saws in standard sizes. Japanese-style pull saws with a replaceable fret-slotting blade are popular for their thin kerf and smooth cut. A depth stop is essential for consistent slot depth. Budget 15 to 40 dollars. ## Tips - Always verify the kerf width against your fret wire tang before slotting an actual fretboard…