TechRef

The drawing says 50.000 +0.200 / -0.000. The machine needs 50.100. TechRef does that math, converts it into every unit, keeps the tables you reach for every day, and records what you measure. Built for the everyday questions on the shop floor. WHY THE CENTER VALUE MATTERS The center of an asymmetric tolerance is not the nominal size. TechRef calculates the true center and the full band, so you get it right in one setup. TOLERANCES FROM THE STANDARD (TechRef Pro) Pick an ISO 2768 class (f, m, c, v) or an ISO 286 fit (hole H7, shafts g6 to p6), and TechRef looks up the deviations for your size. Pick a shaft to see how it fits an H7 hole: clearance, transition or interference. Use ISO, JIS, EN, DIN or BS names. ENGINEERING CALCULATORS (TechRef Pro) • Section properties: A, I, Z, Ip and Zp for round bar, tube, rectangle and box section • Tension, compression and shear stress • Bending, torsion and combined stress, including von Mises • Beam deflection: cantilever and simply supported, point or uniform load • Weight of bars, tubes and plates • Thermal expansion and thermal stress Pick a material from the list to fill in density, E and α. Every result shows its formula. Metric (mm, N, MPa) or inch (in, lbf, psi). REFERENCE TABLES • Materials (TechRef Pro): 78 grades of stainless steel, steel, aluminium, copper, titanium, nickel, magnesium and plastics. JIS, AISI, UNS and EN names side by side, with density, E, α, strength and hardness • Thread dimensions (TechRef Pro): metric 6g/6H and Unified 2A/2B limits of size • Tap drills (TechRef Pro): metric, Unified and Whitworth, with minor diameter limits • Tolerances (TechRef Pro): ISO 2768, ISO 286 and inch fits (ANSI B4.1: RC, LC, LT, LN, FN) • Hardness conversion for steel (TechRef Pro): HRC, HV, HB, HRA, HRB, HS and approximate tensile strength, for reference Values are compiled with reference to officially published standards information. MAKE THE TABLES YOUR OWN (TechRef Pro) Change a tap drill or a material value to the one your shop uses, add your own drills and materials, and add a memo to any row. Your values are shown in color. If TechRef later corrects a default you changed, the cell is marked so you can choose which value to keep. Your own materials appear in the calculators too. RECORD WHAT YOU MEASURE Add measured values to any point in a sheet. Each entry updates the count, mean, max, min, range, standard deviation, deviation from target, out-of-tolerance count, Cp and Cpk. Measured values are free and not counted toward the save limit. INSPECTION SHEETS, HISTORY AND CSV Create a sheet per part with points, each with its own dimension and tolerance. Save conversions and calculator results to History with a label and a memo. Export CSV per point or per measured value. 13 CATEGORIES, 100+ UNITS Length, pressure, torque, force, temperature and more. Show only the units you use. Factors come from exact definitions, never rounded approximations. Tolerance bands are rounded inward, so a part inside the band on screen is inside it for real. iCLOUD BACKUP Sheets, history, settings and your own table values are backed up to your own iCloud, automatically or when you choose. Restore them on a new iPhone or iPad. The developer cannot see your data. No ads, no tracking, no analytics, no account. FREE, AND TechRef Pro Conversions, manual tolerances, drill charts, the cutting speed and feed calculator, Sheets, measured values, CSV export and iCloud backup are free. Saving dimensions has a limited number of free saves, then once per hour. TechRef Pro, a one-time purchase, removes the limit and unlocks the tables, tolerances from the standard, the engineering calculators and your own values. No subscription. ALSO 10 languages · 1 to 6 decimal places · How to Use · Dynamic Type · Light and dark · iPhone and iPad