Tap drill, 2A/2B limits, threading passes and over-wires verification
Thread Cutting & Measurement Suite
Run a thread from print to gauge: size the hole or blank, hold the ASME B1.1 2A/2B limits, plan the cutting passes and verify the pitch diameter over wires.
Entry intents thread cutting calculator single point threading calculator lathe threading calculator g76 threading cycle calculator tap drill size calculator thread tolerance calculator measure threads over wires calculator thread pitch diameter calculator tapping feed rate calculator
Workflow map
Start at the stage that matches the job in front of you; each stage links directly to the calculators and lookup tools that support it.
- 1
Size the hole or blank
Tap drill into the 2B minor band for internal threads; blank and limit row for external — straight from the B1.1 formulas.
- 2
Cut the thread
Constant-chip-area pass ladder for single-point work, pitch-locked feeds for taps and thread mills.
- 3
Verify the fit
Convert the wire measurement to pitch diameter, check it against the limit row, and confirm engagement carries the load.
Tools in this workflow
Calculators come first, followed by lookup tools and reference pages when this workflow needs tabular data.
Calculator Tap Drill Size Tap drill diameter for any metric or unified thread at your chosen % thread engagement. Calculator Unified Thread Limits (2A/2B) ASME B1.1 limits from diameter and TPI: 2A allowance, major and pitch diameter limits, 2B pitch and minor limits — table-exact, any UNS pitch. Calculator G76 Threading Infeed Constant-chip-area threading passes: cumulative depth total × √(n/N) with the full pass ladder, first/last depths and a rubbing check. Calculator Tapping Feed Rate Tapping feed rate Vf = spindle RPM × thread pitch; the feed per rev equals the pitch. Calculator Thread Mill Feed Compensate thread-mill feed for helical interpolation — tool-centre from cutting-edge feed. Calculator Thread Pitch Diameter Pitch (effective) diameter of a 60° thread by the three-wire method, plus the best wire size. Calculator Thread Engagement Check engaged thread length against internal and external thread stripping for metric, UNC and UNF threads. Reference Tap drill chart Reference Thread pitch chart
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