The allowable minor diameter indicates sizes from minimum to 6H, but the fine threads smaller than M1.8×0.2 are 4H and that of smaller than M2×0.25. You are welcome to contact us If any questions about CNC machining threads. This Standard contains general metric standards for a 60-degree symmetrical screw thread with a basic ISO 68 designated profile. Hole size for general Metric threads Unitmm: Nominal size: Pitch: Percentage of thread engagement hole diameter (mm) Minor dia of internal thread: 100: 90: 80: 70: M1: 0.25: 0.73. ![]() To select the suitable thread cutting tool does matter for different kinds of raw material or thread dimensions. General Note: All dimensions are in millimeters.Īn internal thread is usually manufactured by a thread tap or a thread cutter, depend on the size of the thread. Our CNC machining services could provide you the parts with precise manufactured thread which is inspected with thread gauge to ensure the quality. These thread sizes and classes represent bolts and screws, as well, as other standard external threads. Threads can take an important role for assembly, mating and functional adjustment. The following table chart are standard metric external thread sizes M 0.25 - M 1.4 per. ![]() Metric threads, no matter the external one or inner one, are widely used on the CNC machined parts.
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