Free Machinist and Fabricator Tools

Speeds and feeds calculators, tap drill charts, hardness converters, unit converters, and more. Built for machinists, fabricators, and engineers. No signups, no ads, no paywalls.

Recommendations

Value-Added Manufacturing Services (Beta)
Vetted American shops for post-cut processing: CNC, anodizing, heat treat, welding, and more.
Other Recommendations
Software, workwear, and tools we recommend for manufacturers.

AI Tools

Mill Cert Reader (Beta)
Upload a mill cert PDF. AI extracts and validates against AMS/ASTM specs.
Raw Stock Size Optimizer (Beta)
Calculate minimum raw stock with machining allowance, kerf, and fixturing.

Calculators

Aluminum Weight Calculator
Calculate weight by dimensions and alloy.
Speeds and Feeds Calculator
RPM, feed rate, and chip load by material and tool.
Material Removal Rate Calculator
MRR in cubic inches per minute for milling.
Chamfer and Countersink Calculator
Chamfer width, depth, and countersink dimensions.
Scrap Value Calculator
Estimate the dollar value of your aluminum drops.
Thermal Expansion Calculator
Dimensional change from temperature shifts.
Stack Tolerance Calculator
Worst case and RSS tolerance stack-up analysis.
Shop Rate Calculator
Calculate your required hourly rate by costs and capacity.
Weld Distortion Estimator
Predict angular distortion, shrinkage, and warping.

Reference Charts

Tap Drill Chart
Tap drill sizes for imperial and metric threads.
Thread Pitch Reference
UNC, UNF, UNEF, and metric thread data.
Drill Size Chart
Number, letter, and fractional drill sizes.
Bolt Torque Reference
Torque values by bolt size, grade, and condition.
GD&T Quick Reference
Geometric dimensioning and tolerancing symbols.
Plate Stock Reference
Standard plate thicknesses and sizes by alloy.
Hardness Converter
HRC, HRB, Brinell, Vickers, tensile strength.
Surface Finish Converter
Ra, Rz, RMS, CLA with reference values.
Machine Taper Reference
CAT40, BT30, HSK, Morse taper dimensions.
G-Code / M-Code Reference
Searchable G and M code reference for Fanuc, Haas, Mazak.
Insert Geometry Decoder
Decode carbide insert designations (CNMG, WNMG, etc.).

Converters

Hardness Converter
HRC, HRB, Brinell, Vickers, tensile strength.
Surface Finish Converter
Ra, Rz, RMS, CLA with reference values.
Metals Unit Converter
Length, weight, stress, density, temperature, gauge.
Decimal / Fraction / mm Converter
Instant conversion between decimal, fraction, and mm.

Selectors

Weld Filler Metal Selector
Find the right filler for your weld by base material.

Viewers

STEP File Viewer
Upload and preview .STEP files in the browser.