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Reaming stock allowance formulas

A reamer removes a small, controlled amount of material to achieve precise hole size and surface finish. Too little stock and the reamer rubs; too much and it overloads, produces a bell-mouthed hole, or breaks. This calculator gives the optimal stock allowance.

• Stock allowance: 0.15 mm for holes < 6 mm, 0.2 mm for 6-12 mm, 0.3 mm for 12-25 mm, 0.4 mm for > 25 mm
• Pre-ream drill diameter = finished hole diameter - stock allowance
• General rule: reaming stock ≈ 0.5-1% of hole diameter for carbide reamers

How to use this Reaming Allowance Calculator

Enter the finished hole diameter. The calculator recommends the stock allowance and the pre-ream drill size. For critical holes, drill undersize, then bore to within reaming allowance, then ream -- this corrects position error before the reaming pass.