Engineering Reference Hub
Technical reference tables, standard dimensions, engineering constants, material data, and interactive engineering charts.
Data Tables & Limits
Standard dimensions, limits, fits, tolerances, threads, fasteners, and engineering lookup tables.
AWG Wire Size Chart & Ampacity
Standard AWG sizes, cross-sectional areas, diameters, electrical resistance, and maximum ampacity tables for electrical wiring.
Bearing Reference
Engineering bearing reference covering types, standard dimensions, designation systems, seals, and load capacities.
General Engineering Reference Data & Constants
Comprehensive compilation of essential engineering constants, material properties, and technical reference data for design calculations.
Limits and Fits Reference
ISO 286 limits and fits calculator tables, clearance, transition, and interference fit standards for shafts and holes.
Galvanic Series of Metals
Galvanic corrosion chart showing the anodic and cathodic relationships of metals in seawater and harsh environments.
IP Rating Chart
Complete IP rating chart explaining solid particle and liquid ingress protection standards for electrical enclosures and hardware.
Machining Parameters & Speeds and Feeds Chart
Standard cutting speeds, feed rates, and machining parameters for turning, milling, and drilling various metals and alloys.
Metric Thread Chart
Standard ISO metric thread sizes, pitch dimensions, and recommended tap drill sizes for mechanical fasteners.
O-Ring Size Chart
Standard AS568 O-Ring size chart including inner diameters (ID), cross-sections (CS), and dimensional tolerances for sealing applications.
Pipe Schedule Chart
Nominal Pipe Size (NPS) dimensions, Schedule 40, Schedule 80 wall thicknesses, and outside diameters for industrial piping.
Plastic & Polymer Materials
Engineering plastics, polymer identification codes, melting points, and typical mechanical properties for manufacturing.
Sheet Metal Gauge Chart
Standard sheet metal gauge chart for steel, aluminum, and galvanized steel with thickness conversions in inches and millimeters.
Standard Keyway Dimensions
Standard shaft keyway dimensions, tolerances, and key sizes for mechanical power transmission components.
Steel Grade Equivalents
Cross-reference chart for international steel standards and material grades including ASTM, DIN, and EN specifications.
Structural Steel Profiles
Dimensions and section properties (area, moment of inertia) for square, rectangular, and circular hollow structural sections.
Surface Roughness Chart
Surface finish conversion chart comparing Ra, Rz, RMS, and N-grade values for machining and manufacturing processes.
UNC & UNF Thread Chart
Unified National Coarse (UNC) and Fine (UNF) thread dimensions and tap drill size charts for imperial fasteners.
Structural & Civil
Beam formulas, structural sections, concrete grades, load coefficients, and timber reference data.
Allowable Deflection Limits
Standard allowable deflection limits (L/240, L/360, etc.) for steel and concrete structural members according to IBC, AISC, and Eurocode standards.
Standard Beam Formulas
Essential structural engineering beam formulas. Quickly find maximum bending moment, shear force, and deflection equations for various load cases.
Minimum Bolt Spacing & Edge Distances
Design requirements for structural steel connections. Standard minimum and maximum bolt spacing, pitch, and edge distance guidelines.
Concrete Strength Grades & Properties
Comprehensive chart of standard concrete grades, characteristic compressive strengths (cylinder vs cube), and typical mix ratios for construction.
Dead Load Densities
Structural engineering reference for dead loads. Unit weight and density table (kg/m3 & lb/ft3) for masonry, timber, concrete, steel, and glass.
Soil Friction Angles & Cohesion
Geotechnical engineering chart for internal friction angle (phi) and cohesion (c) values of various soil types including sand, clay, and gravel.
Rebar Hook & Bend Allowances
Reinforcement detailing guide. Standard pin diameters, minimum bend radii, and extension lengths for 90-degree, 135-degree, and 180-degree rebar hooks.
Soil Classification System (USCS)
Unified Soil Classification System (USCS) breakdown and estimated allowable bearing capacities for shallow foundation design.
Ergonomic Stair Tread & Riser Proportions
Design guidelines for safe stairs. Standard riser heights, tread depths, and the universal stair formula (2R + T) for optimal ergonomics.
Nominal vs Actual Timber Dimensions
Dimensional lumber chart converting nominal sizes (like 2x4, 4x4) to actual dry dimensions in inches and millimeters for structural framing.
Welded Wire Mesh Sizes & Weights
Standard dimensions, wire spacings, cross-sectional areas, and unit weights per square meter for welded wire fabric (mesh) reinforcement.
Wind & Snow Load Coefficients
Reference tables for wind pressure shape coefficients, exposure categories, and basic snow load factors based on roof pitch and geometry.
Electrical & Electronics
AWG wire sizes, current capacity, NEMA enclosures, PCB trace widths, and electrical reference data.
Busbar Ampacity Chart
Standard continuous current carrying capacities (ampacity) for rectangular copper and aluminum busbars in electrical panels.
Standard Cable Types & Insulation Ratings
Guide to electrical wire types, insulation acronyms, temperature ratings, and standard application environments.
Standard Conduit Sizes & Fill Capacities
Reference chart for nominal conduit diameters and maximum allowable wire fill ratios (fill capacity) for safe electrical installations.
Standard Fuse & Breaker Ampere Ratings
List of standard nominal current ratings for low-voltage miniature circuit breakers (MCB), molded case circuit breakers (MCCB), and fuses.
PCB Trace Width Calculator Chart
Printed Circuit Board (PCB) trace width tables for 1 oz and 2 oz copper weight based on standard IPC-2152 current carrying capacities.
Resistor Color Code Chart
Easy-to-read resistor color code table to determine resistance values, multipliers, and tolerances for 4-band, 5-band, and 6-band resistors.
RF Connector Types & Frequency Bands
Engineering guide to standard RF (Radio Frequency) connectors, their impedance (50/75 Ohm), and maximum operating frequency limits.
RJ45 Ethernet Pinout Diagram
Standard color-coded pinout wiring diagrams for RJ45 connectors showing both T568A and T568B straight-through and crossover configurations.
Standard Battery Sizes & Capacities
Physical dimensions, nominal voltages, and typical milliampere-hour (mAh) capacities for standard cylindrical and coin cell batteries.
Thermocouple Types, Colors & Temperature Ranges
Thermocouple reference chart detailing temperature limits, alloy compositions, and standard IEC/ANSI wire color codes for industrial sensors.
Standard Transformer Ratings (kVA)
Preferred nominal apparent power (kVA) and MVA ratings for single-phase and three-phase distribution and power transformers.
World Mains Voltage & Frequency Chart
Comprehensive global list of standard residential and industrial mains AC voltages (110V/220V), frequencies (50Hz/60Hz), and plug types by country.
Physics & Constants
Physical constants, thermodynamic properties, material densities, and commonly used engineering values.
Standard Atmospheric Pressure
Engineering reference for standard atmospheric pressure values. Quick conversion table for atm, bar, Pascals (Pa), psi, and mmHg.
Avogadro's Number & Molar Mass of Air
Standard reference for Avogadro's number and the precise molar mass of dry air for chemistry and thermodynamic calculations.
Coefficient of Thermal Expansion (CTE)
Linear coefficient of thermal expansion (CTE) chart for common engineering materials including steel, aluminum, copper, and plastics.
Ideal Gas Constant (R)
Universal ideal gas constant (R) values provided in various unit systems (J/mol·K, L·atm/mol·K, etc.) for thermodynamic equations.
Material Densities Chart
Comprehensive density chart (kg/m3 & g/cm3) for common engineering solids, liquids, and gases used in structural and mechanical design.
Permittivity & Permeability of Free Space
Fundamental electromagnetic constants: Vacuum permittivity (ε0) and vacuum permeability (μ0) values for electrical engineering.
Specific Heat Capacities (cp, cv)
Specific heat capacity reference table for common metals, liquids, and ideal gases at standard temperatures and pressures.
Stefan-Boltzmann Constant
Standard value of the Stefan-Boltzmann constant (σ) and its application in black-body radiation and thermal heat transfer engineering.
Thermal Conductivity Constants (k)
Thermal conductivity (k-values) chart for metals, insulators, liquids, and gases to calculate heat conduction rates.
Dynamic & Kinematic Viscosity of Water and Air
Temperature-dependent absolute (dynamic) and kinematic viscosity tables for water and air used in fluid mechanics calculations.
Concepts & Glossary
Engineering concepts, definitions, formulas, terminology, and technical explanations.
Bernoulli's Principle
Understand Bernoulli’s principle in fluid mechanics. Explore the relationship between fluid speed, pressure, and potential energy with practical engineering examples.
Factor of Safety (FoS)
Learn how to calculate the Factor of Safety (FoS) based on yield strength and ultimate tensile strength for reliable mechanical and structural design.
Galvanic Corrosion Explained
Discover the mechanics of galvanic corrosion between dissimilar metals. Review the anodic index series and learn standard engineering prevention methods.
Hooke's Law
Engineering reference for Hooke’s Law. Learn about the linear elastic region, Young’s Modulus, and the fundamental stress-strain relationship.
Moment of Inertia vs Area Moment
Understand the critical difference between Mass Moment of Inertia (dynamics) and Area Moment of Inertia (bending stiffness) in structural mechanics.
Poisson's Ratio
Definition and typical values of Poisson’s Ratio for common materials like steel, aluminum, and rubber. Learn how longitudinal stress causes transverse strain.
Reynolds Number (Re)
Calculate the Reynolds Number for fluid flow. Differentiate between laminar, transitional, and turbulent flow regimes in pipes and open channels.
Ultimate Tensile Strength (UTS)
Detailed explanation of Ultimate Tensile Strength (UTS) in materials science. Compare yield strength vs ultimate strength on a stress-strain curve.
Von Mises Yield Criterion
Engineering guide to the Von Mises stress formula. Learn how equivalent stress is used to predict yielding of ductile materials under multiaxial loading.