TapDrill: Tap & Thread Charts

The tap drill chart that lives in your pocket — and never asks for a subscription. TapDrill is a fast, offline fastener reference for machinists, engineers, mechanics, and makers: every thread, every drill size, every torque spec, two taps away. FREE FOREVER • Complete UNC/UNF inch thread charts (#0–1") with 75% tap drills • Clearance drills in close and free fit • Full drill index — all 414 number, letter, fractional, and metric sizes • Nearest-drill finder: type any diameter, get the closest stock drills • Thread identifier: measure a mystery bolt, get ranked matches • On-screen bolt gauge with card calibration — hold the bolt to the screen • Cutting speeds: tap any drill for HSS RPM across nine materials • Shop Mode: giant type readable from the machine, screen stays awake PRO — ONE-TIME PURCHASE • Every metric thread, M1.6–M30, coarse and fine, with ISO clearance holes • NPT pipe thread tap drills, 1/16" through 2" • Torque tables: SAE Grade 2, 5, 8 and metric 8.8, 10.9, 12.9 — dry and lubricated • Adjustable thread engagement (50–85%) that re-picks the stock drill NO NONSENSE • 100% offline — basement shop, jobsite, no signal, no problem • No account. No ads. No tracking. No data collected. Ever. • Pro is a single purchase. Own it forever. Values follow ASME B1.1 / ISO 261 practice at 75% thread engagement. Always follow the drawing or manufacturer spec for critical work.