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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.

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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.
Plate Warp and Distortion Risk Calculator
New
Predict how much 6061, 7075 or 7050 plate bows after machining.
Plate Thickness Tolerance and Cleanup Calculator
New
ASTM B209 thickness tolerance and whether the part will clean up.
Thread Pull-Out and Engagement Calculator
New
Strip load and minimum thread engagement in aluminum.
Anodize Growth and Pre-Anodize Size Calculator
New
Pre-anodize machining size for bores, ODs, slots and tapped holes.
Buy-to-Fly Ratio and Cost Per Part Calculator
New
Chip weight, scrap credit, and true material cost per part.
Tool Deflection and Chatter Risk Calculator
New
End mill tip deflection, L to D risk band, and what to change first.
Surface Finish Predictor
New
Achievable Ra and Rz from feed and nose radius, plus max feed for a target finish.
Tolerance Feasibility and Cost Checker
New
Cheapest process that holds a callout, the cost band, and what is really governing.

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.
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.).
Plate Stock Reference
Standard mill plate sizes and stocked thicknesses by alloy.
Plate Flatness and Bow Tolerance Chart
New
How much bow and waviness ASTM B209 actually allows, by size.
Spec Cross-Reference and Obsolescence Checker
New
QQ-A-250, AMS and ASTM B209 with active or cancelled status.

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.
Spec Cross-Reference and Obsolescence Checker
New
QQ-A-250, AMS and ASTM B209 with active or cancelled status.

Selectors

Weld Filler Metal Selector
Find the right filler for your weld by base material.
Fixture and Tooling Plate Selector
New
Cast tool and jig plate, 6061-T651, or 7075-T651 for your fixture.
Bandsaw Blade TPI and Speed Selector
New
TPI, band speed and feed for cutting aluminum plate.

Viewers

STEP File Viewer
Upload and preview .STEP files in the browser.
Block Size Viewer
Visualize a block of plate to scale before you order it.
Grain Direction and Thick Section Planner
New
L, LT and short transverse properties, and how to orient the blank.