EngReference
Engineering Reference
Calculators and reference tables for mechanical engineering — tolerances, fasteners, stress analysis, materials, and more.
All categories
Fits & Tolerances
2/4 tools live
ISO standards for dimensional tolerances, fits, and geometric deviations.
ISO 286 — Fits Calculator
Limit deviations and clearance for hole/shaft fits
ISO 2768 — General Tolerances
Linear, angular, and geometric tolerance lookup
Tolerance Stackup
Worst-case and statistical stackup analysis
GD&T Reference
Geometric dimensioning and tolerancing symbols
Fasteners
1/4 tools live
Torque, preload, and thread engagement calculations for bolted joints.
ISO 273 — Clearance Holes
Clearance holes sizing reference
Bolt Torque & Preload
Tightening torque and clamp force for metric bolts
Thread Engagement Length
Minimum engagement for full thread strength
Bolt Pattern
Bolt circle layout and load distribution
Mechanical
0/4 tools live
Stress, deflection, and fatigue calculations for structural elements.
Axial Stress & Strain
Stress, strain, and factor of safety
Beam Deflection
Deflection and bending stress for common load cases
Torque & Shaft Stress
Torsional shear stress and power transmission
Buckling (Euler)
Critical load for slender columns
Materials
0/3 tools live
Mechanical properties and selection data for common engineering materials.
Material Properties Table
E, G, yield, UTS, density for metals and polymers
Material Selector
Filter materials by property requirements
Unit Converter
Stress, force, pressure, and length conversions
Springs
0/3 tools live
Spring rate, stress, and fatigue life for compression, extension, and torsion springs.
Compression Spring
Rate, stress, and natural frequency
Extension Spring
Rate and initial tension
Torsion Spring
Angular rate and stress
Fluid Mechanics
0/3 tools live
Pipe flow, pressure drop, and Reynolds number calculations.
Pipe Flow
Reynolds number, flow regime, friction factor
Pressure Drop
Darcy-Weisbach for pipes and fittings
Orifice Flow
Flow rate through an orifice
Values for reference only — verify with applicable standards for production use.