ISO Fit & Thread

⚙️ ISO Fit & Thread is the ultimate offline engineering companion for machinists, CNC programmers, mechanical designers, draftsmen, and manufacturing students.

Get fast, precise calculations directly on the shop floor, in the design office, or in the classroom. 🛠️

--- 🌟 KEY FEATURES 🌟 ---

📐 1. ISO LIMITS & FITS CALCULATOR (ISO 286 / ANSI B4.2)
• Enter nominal sizes from 1 mm up to 3150 mm to compute deviation limits instantly.
• Select standard hole and shaft tolerance classes (e.g., H7/g6, H8/f7, N7/p6).
• Real-time, dynamic tolerance envelope diagrams showing limits, clearance, and interference visually.
• 📊 Dual-Unit Display: View deviation tolerances in both millimeters (mm) and micrometers (microns, µm) for premium machining accuracy.
• Automatic fit classification identifier: Clearance Fit, Transition Fit, or Interference Fit.

🔩 2. THREAD PITCH CALCULATOR
• Comprehensive database of standard Metric ISO M-threads.
• Computes essential thread geometries: Major Diameter (d), Pitch (P), Pitch Diameter (d2/D2), and Minor Diameters (d1/D1) for both internal and external threads.
• Displays recommended wrench/spanner sizes for fast assembly reference.
• Interactive, high-resolution cross-section thread profile diagram that updates in real-time.

⚡ 3. TAP DRILL CALCULATOR
• Find the recommended tap drill bit size for any thread profile.
• Features standard fractional and decimal inch equivalents alongside metric sizes.
• Calculates exact thread engagement percentages based on drill selection to prevent tap breakage.
• Lists alternate drill bit recommendations for custom fit tight or loose tolerances.
• Visual tapping hole diagram showing tap/hole boundary relationships.

💾 4. SAVED HISTORY & EXPORT
• Save calculations to a local History list (up to 100 slots).
• 📌 Pin important measurements so they never expire.
• 📊 Export saved history as a spreadsheet (.CSV) for reporting or sharing.
• 📱 Share results and diagram drawings directly as PNG images or text summaries with your engineering team.

--- 💡 DESIGNED FOR PRECISION 💡 ---
• 🌙 Dark Theme Support: Beautiful, high-contrast dark UI that is easy on the eyes in machine shops.
• 📶 100% Offline Capability: Fully functional without an active internet connection.
• 🚀 Light, fast, and optimized for performance.

Download ISO Fit & Thread today to eliminate manual lookup tables and speed up your manufacturing design workflow! 🚀