Machining Methods and Achievable Tolerances for Common Part Features

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Machining Methods and Achievable Tolerances for Common Part Features

Last updated on Dec 29, 2025

Mechanical components feature various structural characteristics (e.g., cylindrical surfaces, holes, threads, splines, gears), and selecting appropriate machining methods directly impacts product precision, manufacturability, and cost. This guide summarizes common machining methods and their corresponding precision levels (Tolerance Grade IT, GB/T standards) for key structural features, enabling engineers to make informed choices based on practical requirements.

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These tables cover external cylindrical surfaces, hole machining, deep holes, and conical holes

1. External Cylindrical Surface Machining

2. General Hole Machining

3. Cylindrical Deep Hole & Conical Hole Machining

4. Spline Hole Machining

1. Form Milling & End Surface

Form Milling Tool Accuracy (Distance between parallel surfaces in $\mu m$)

End Surface Machining (Accuracy to Datum in $\mu m$)

Face Milling (Accuracy from machined surface to datum in $\mu m$)

I. Metric Thread Machining (公制螺纹加工)

This table outlines various machining methods for metric threads, including accuracy grades and corresponding thread tolerances according to standard GB/T 197—2003.