TapDrill is an offline reference calculator built for machinists, toolmakers, CNC programmers, and fabricators working in demanding shop floor environments. Operating in metal-clad manufacturing plants often means zero cellular connectivity. TapDrill runs completely offline without requiring an internet connection, account creation, or background data access. Retrieve exact tooling parameters instantly at your manual knee mill, lathe, or CNC machining center. KEY ENGINEERING FEATURES • Comprehensive Thread Standards: Fast lookup for Unified National (UNC, UNF, UNEF), ISO Metric coarse and fine, NPT pipe threads, and British Standard pipe fittings (BSPP/BSPT). • Precise Engagement Calculations: Determine exact pilot hole diameters based on target thread percentage (50% to 75% engagement). Prevent broken taps in hardened alloys and eliminate weak, stripped threads in structural assemblies. • Cutting Speeds & Feeds: Calculate spindle RPM and cutting feed rates directly from Surface Feet per Minute (SFM) or meters per minute (m/min) across common materials, including mild steel, stainless grades, brass, and aluminum. • Clearance Hole Tolerances: Inspect standard close, normal, and loose clearance drill sizes for machine screws and structural bolts. • Unit Conversion Utility: Seamless bidirectional conversion between decimal inch fractions and metric millimeters to verify digital blueprint dimensions instantly. BUILT FOR SHOP FLOORS • 100% Offline Architecture: All lookup tables and mathematical formulas are stored locally on your device. • Clean Visual Layout: High-contrast typography designed for quick reading under machine shop lighting conditions. • Zero Intrusive Tracking: No unnecessary device permissions requested.

Data Safety & Offline Privacy Guarantee:
- 100% Offline: This application operates entirely on your device without requiring an active internet connection.
- Zero Data Collection: We do not collect, monitor, track, store, or transmit any personal identifiable information (PII), device identifiers, or usage telemetry.
- No Accounts or Subscriptions: Enjoy complete utility with zero account creation, logins, or hidden recurring fees.
- Local Storage Only: All items, history, and preferences are retained strictly within on-device sandboxed storage.