Threadfold Charts

Threadfold Charts is an offline machine-thread and fastener plate deck for machinists, fab-shop techs, makerspace leads, and mechanical students. Flip full-bleed plates like a physical stack of stamped gauge cards. Each plate is dominated by an oversized thread designation—such as M8×1.25 or 1/4-20 UNC—with series, pitch, major/minor/pitch diameters, recommended tap drill, clearance drill, tolerance class, engagement length, and material notes arranged as engraved edge rails. A central photo well and a short numbered prep-step strip (spot, tap, chase, gauge) keep the cut workflow in view. Need a different size or material? Open the live tap-drill workshop. Enter major diameter, pitch, desired percent of thread, and material factor to recompute tap drill in mm or inches, the closest standard bit, and recommended engagement length instantly. Cross standards with the metric↔inch map to surface nearest UNC, UNF, UNEF, or ISO metric alternates with pitch and drill deltas highlighted. Settle the choice before cutting with side-by-side compare mode—rails and drills aligned on two plates at once. Stack selected plates into a project fastener kit with quantities, required drill bits, and tap list. Share or export a single plate or whole kit as a PDF bench sheet plus CSV bit list for the floor. Capture a still of the machined part or fastener and bind a short voice annotation only to the active plate, so a proven shop setup becomes a reusable, signal-free bench reference. Camera is used solely for part reference stills; microphone solely for per-plate voice cues. In-app Privacy Policy and Terms, purpose copy, and first-run consent are included. The library runs fully offline with series filters and favorites. Thirty fully authored seed plates ship ready—ISO metric coarse and fine, UNC/UNF, and selected BSPP/NPT—with complete rails, prep steps, and swatch photos. No stubs. No network required.

Recent changes:
Initial production release of Threadfold Charts.

First release with thirty finished seed plates—full rails, prep steps, and photos. Live tap-drill workshop recomputes drill size, percent thread, and engagement. Metric-inch cross-map, side-by-side compare, kit builder, and PDF/CSV export. Pin camera stills and voice annotations to any plate—all fully offline.

Threadfold Charts is an offline machine-thread and fastener plate deck for machinists, fab-shop techs, makerspace…