New Tools in Stock! Mouthpiece Backbore Reamers and Peg Hole Reamers Now Available!

Originators and Designers of Specialty Reamers and Cutting Tools Since 1918

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Reamer Sizing Calculator

Reamer Sizing Calculator

Enter the nominal and maximum hole diameters.


Hole Tolerance = Max hole – Nominal
Max Reamer Diameter = Max Hole – 0.15 × Tolerance
Min Reamer Diameter = Max Reamer – 0.35 × Tolerance
Manufacturing Tolerance = Max Reamer – Min Reamer


Hole Tolerance: ... in
Maximum Reamer Diameter: ... in
Minimum Reamer Diameter: ... in
Manufacturing Tolerance: ... in