Thread Pitch Gauge: Tap Drill

Turn your iPhone or iPad into a calibrated thread gauge and practical machining toolkit.

Thread Pitch Gauge helps machinists, CNC operators, mechanics, fabricators, and serious DIY users identify fasteners, choose drills, calculate layouts, and create shop-ready templates—right at the machine.

MEASURE & IDENTIFY
• Match an unknown thread with an on-screen pitch gauge.
• Measure diameter with the virtual caliper.
• Use the guided thread wizard and reference tables for ISO Metric, UNC, UNF, UNEF, NPT, BSPT, and SAE machine-screw standards.
• Find tap drills, clearance holes, drill sizes, and metric/inch equivalents.
• Create and save custom thread entries.

MACHINING & LAYOUT CALCULATORS
• Surface Speed / RPM / Diameter
• Bolt Circle / PCD with X/Y coordinates, start angle, and CW/CCW direction
• Single-row and variable-diameter hole spacing
• Rectangular, circular, and oval hole patterns
• Right Triangle calculations
• Diameter Tape
• Dividing Plate layouts

SAVE, PRINT & SHARE
Keep important calculations with names and notes, then export PDF reports, CSV coordinate tables, or SVG drawings. Generate true-size Diameter Tape and Dividing Plate templates where supported.

BUILT FOR REAL SHOP WORK
• Switch between metric and imperial units.
• Works offline—no account required.
• Localized for 33 languages.
• Designed for iPhone and iPad.

FREE TO PREVIEW
Download free and preview every feature. A single Full Access purchase unlocks all calculations, interactive controls, saving, and export forever. No subscription.

Whether you are identifying a mystery bolt, setting spindle RPM, laying out a flange, or preparing a drilling template, Thread Pitch Gauge replaces scattered charts and single-purpose calculators with one fast, organized shop companion.

Important: Calibrate on-screen measuring tools before use. Printed template accuracy depends on printer scaling. Always verify critical dimensions and machining parameters before cutting.