ANSI Fit & Thread

🚀 Speed up your engineering designs and machining setups! ANSI Fit & Thread is an offline, precision calculator tailored for mechanical engineers, CNC operators, machinists, designers, and students. Calculate standard tolerances, clearance/interference limits, thread geometries, and tap drill sizes instantly using imperial ANSI standards. Key Features: 1. ANSI B4.1 Fits & Tolerances Calculator • Enter nominal sizes (from 0.01" up to 19.69") and get exact limit values. • Supports standard ANSI tolerance classes including: - Running/Sliding Fits (RC) - Locational Clearance Fits (LC) - Transitional Fits (LT) - Locational Interference Fits (LN) - Force/Shrink Fits (FN) • High-fidelity engineering diagrams showing hole/shaft envelopes. • Displays Max/Min clearances, interferences, and Allowance. 2. Unified Thread Pitch Calculator • Look up standard ANSI/ASME thread details (UNC, UNF series). • Instantly retrieves Major Diameter, TPI (Threads Per Inch), Pitch, Pitch Diameter, and Minor Diameter. • Shaded 60° thread profile visual diagrams showing reference boundaries. 3. Tap Drill Size Calculator • Instantly calculates the theoretical ideal tap drill size. • Recommends the best standard drill bits (Fractional, Letter, Number, or Metric sizes) for target thread engagements. • Displays real-time thread engagement percentage progress charts. • Provides alternative drill sizes with precise decimal equivalents. • Tapped hole engineering cross-hatch diagrams with clear annotations. 4. History Management & Export • Auto-saves recent calculation records to a rolling history list. • Pin favorite measurements so they never expire. • Search through history by custom names, sizes, or parameters. • Export history to a standard CSV file for spreadsheets and reports. • Native Android share sheet support with clean diagram images and text descriptions. Why Choose ANSI Fit & Thread? • 100% Offline: No internet connection required. Perfect for workshops and factories. • Privacy First: Zero accounts, zero analytics tracking on calculation details. Your data stays on your device. • Single-Screen UX: Smooth tab navigation with clear, readable monospaced layouts—no nested menus or popups. • Clean M3 Design: Optimized light and dark themes with Machinist Steel styling. Disclaimer: This application is a curated lookup and formula reference tool. For safety-critical or production tolerancing designs, always cross-reference outputs with official ANSI/ASME standards.