Engineering reference
EngiRef
Engineering formulas, materials, constants, unit conversions, reference tables, and study tools.
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Disciplines
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View allMechanical
Statics, dynamics, machine design, and mechanics
Electrical
Circuits, power, electromagnetics, and electronics
Civil
Structures, beams, columns, and hydraulics
Thermo
Heat transfer, cycles, and energy systems
Fluids
Fluid mechanics, pipe flow, and hydraulics
Materials
Stress, strain, material properties, and failure
17 items
Categories
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Formulas
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View allNormal Stress
Stress is force per unit area acting on a material
Normal Strain
Strain is the ratio of deformation to original length
Hooke's Law
Linear relationship between stress and strain in elastic region
Shear Stress
Average shear stress from transverse force
Torque
Torque (moment) from a perpendicular force
Moment of Inertia (Rectangle)
Second moment of area for a rectangular cross-section about centroidal axis
Moment of Inertia (Circle)
Second moment of area for a circular cross-section
Newton's Second Law
Force equals mass times acceleration
56 items
Materials
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View allAISI 1018 Carbon Steel
carbon-steel
AISI 1020 Carbon Steel
carbon-steel
AISI 1045 Carbon Steel
carbon-steel
AISI 4130 Chromoly Steel
carbon-steel
AISI 4140 Alloy Steel
carbon-steel
AISI 4340 Alloy Steel
carbon-steel
ASTM A36 Structural Steel
carbon-steel
ASTM A992 Structural Steel
carbon-steel
134 items
Units
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Constants
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View allSpeed of Light in Vacuum
Exact defined value in SI. Maximum speed in universe.
Planck Constant
Exact defined value in SI. Relates photon energy to frequency.
Reduced Planck Constant
h/(2π). Common in quantum mechanics.
Elementary Charge
Exact defined value in SI. Charge of a proton.
Avogadro's Constant
Exact defined value in SI. Particles per mole.
Gravitational Constant
Universal gravitation constant. F = GMm/r².
Fine Structure Constant
Dimensionless. Characterizes electromagnetic interaction strength.
Vacuum Permittivity
Electric constant. Appears in Coulomb's law.
15 items
Metric Bolts
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