Plan the passes for a threading cycle. Enter thread type, pitch and radial infeed per pass to get the pass count, the depth of each pass and the total threading time.
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Request a Proposal →Threads are rarely cut in a single pass. Multiple passes at incrementally increasing depths ensure consistent insert wear, good surface finish, and accurate thread form. This calculator estimates the number of passes needed.
A single pass overloads the insert tip, causing chipping, poor surface finish, and inaccurate thread form. Multi-pass strategy distributes the cutting load, especially important for carbide inserts which are brittle at the sharp thread-crest edge.
Constant volume removal: first pass takes the largest depth (0.2-0.25 mm), subsequent passes decrease incrementally. This keeps the chip cross-section constant and maximises insert life. Many CAM systems call this "progressive depth of cut."
1-2 spring passes (zero additional depth) for steels and stainless. 2-3 for difficult materials like titanium and Inconel. Spring passes clean up deflection and improve thread form accuracy without removing additional material.
Enter the total thread depth and pitch. The calculator estimates the number of passes required and the estimated cycle time. Consider adding 1-2 spring passes for critical threads.
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Use the calculator freely. If the result points to a tooling or process problem, we can source the exact carbide tooling you need from vetted factories in China. Compare factory-direct pricing.
Before you commit to a spec, it helps to know what the market pays for it. These are real, publicly listed factory prices — not a quotation, and not a guess.
We source the tool families below direct from vetted Chinese factories, matched to the material and tolerance you just worked out. Every batch ships with its material certificate and dimensional record.
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PLANNING THREADING PASSES? On threading tools, a supplier's own grade and coating choices matter more than the geometry does. See how MOQ and grading work by tool family.
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