Browser-based calculators and reference tables for mechanical engineers
Practical, browser-based tools built from real engineering work — no login, no installation, no nonsense. Covers structural calculations (beams, bolts, welds), material databases (ČSN / EN / DIN / AISI cross-references), geometric norms (ISO tolerances, fits, surface roughness), and fastener reference tables per EC3 / DIN / VDI.
Reference table for aluminium alloys 1xxx–7xxx. EN AW designations, temper codes (T6, T4, H32), mechanical properties, machinability, weldability and typical applications.
ATEX reference: equipment categories, zones (0/1/2/20/21/22), equipment groups (IIA/IIB/IIC), temperature classes T1–T6, protection types Ex d/e/i/n/p. Per ATEX 2014/34/EU and IEC 60079.
Calculate L10 and L10h bearing life per ISO 281. Ball and roller bearings, reliability adjustment (a1), equivalent dynamic load.
Reference table of dynamic (C) and static (C0) load ratings for deep groove ball bearings 6000–6320 and cylindrical roller bearings NU 2200–2320. Filter by series and bore diameter.
Calculate section modulus Wx and bending stress σ = M/Wx for rectangular, circular, hollow, and standard steel profiles (IPE/HEA/HEB). Includes yield check per EC3.
Reference table of bolt property classes 4.6 – 12.9: yield strength fyb, ultimate strength fub, hardness HV/HB/HRC, proof load, and material per ISO 898-1.
Calculate shear and bearing resistance of bolts per EC3. Single and double shear, bolt grade 4.6–12.9, plate thickness and material input.
Reference table of bolt strength classes per ISO 898-1. Yield strength fyb and ultimate strength fub for grades 4.6 through 12.9.
Browser-based calculator for bolt tightening torques per ISO 898-1. Select strength class and friction condition to get preload force and required torque for M3–M24.
Euler column buckling calculator. All four boundary conditions (cases I–IV), common cross-sections, slenderness λ, critical force Fcr and PASS/FAIL assessment.
Full penetration butt weld strength check per ČSN EN 1993-1-8. Enter plate thickness, weld length and load type to verify design resistance in tension, compression or bending.
Calculate tip deflection, support reaction and fixed-end moment for cantilever beams with uniform distributed load and point load at tip. Checks L/180 limit.
Chain drive calculator: transmission ratio, pitch diameters, chain length in links, actual centre distance, wrap angle and polygonal effect. Supports all standard ISO 606 pitches.
Design and check cylindrical compression springs: spring rate k, shear stress τ with Wahl correction, solid length Ls, deflection at F1/F2, buckling check. Per DIN EN 13906-1.
Material database for copper alloys per EN 1652 / EN 1982. CuZn (brass), CuSn (tin bronze), CuAl (aluminium bronze), CuNi, CuBe — mechanical properties, machinability, applications.
Calculate cross-section characteristics: area A, moment of inertia Ix/Iy, section modulus Wx/Wy, and radius of gyration ix/iy for standard shapes and IPE/HEA/HEB profiles.
Reference database of Czech ČSN steel grades with properties and EN/DIN/AISI equivalents. Structural, engineering, stainless and tool steels.
Reference table of 90+ engineering materials: structural, stainless and tool steels, aluminium alloys, cast iron, copper, brass, titanium and technical plastics. Cross-reference ČSN / EN / W.Nr / DIN / AISI, weldability and machinability.
Multi-category unit converter for engineering: length, mass, force, pressure, torque, temperature, energy, power, area, volume and angle. Enter any value, all units update instantly.
Extension (tension) spring calculator per DIN EN 13906-2. Spring rate k, shear stress τ (Wahl corrected), initial tension, free length, working length at F1/F2.
Check fillet welds under tension, shear and bending per ČSN EN 1993-1-8 (EC3). Computes σ⊥, τ⊥, τ‖ stresses, comparison stress, and PASS/FAIL verdict for S235–S460 steel grades.
Fillet weld strength calculator per ČSN EN 1993-1-8 (EC3), simplified method. Tension, shear, and bending load cases. Calculates throat area, weld stress, design resistance, and utilisation ratio for S235–S460 base materials.
Fixed beam reactions, fixing moments MA/MB, max deflection and M-diagram for UDL, central point load or eccentric point load. Full bending moment diagram in SVG.
Reference table for static and kinetic friction coefficients for common material pairs: steel/steel, steel/bronze, steel/PTFE, rubber/asphalt, wood/wood — dry and lubricated conditions.
Quick reference for geometric tolerances per ISO 1101 / ASME Y14.5. All 14 symbols with SVG icons, descriptions, tolerance frame structure, and examples for form, orientation, location and runout.
Convert hardness values between Brinell (HB), Rockwell C (HRC), Vickers (HV) and tensile strength Rm per EN ISO 18265. Enter any value, get all others.
Quick reference for steel heat treatment methods: quenching, tempering, annealing, case hardening, nitriding, induction hardening. Temperature ranges, achievable hardness and typical steels.
Reference table for IP ingress protection codes per IEC 60529: solid particle and water protection levels IP20 to IP69K, with descriptions and typical applications.
Browser-based ISO 286-1 tolerance and fits calculator. Enter nominal diameter, select hole and shaft designations, get limit deviations, tolerance zones, and fit type.
Complete ISO metric thread dimensions table: nominal diameter, pitch (coarse + fine), pitch diameter, minor diameter, stress area, and wrench sizes for M1–M68.
Look up standard parallel key dimensions (b × h) for a given shaft diameter per DIN 6885 Form A. Check key against surface pressure p = 2M / (d · lₑ · t) and shear τ = 2M / (d · lₑ · b).
Reference table of achievable IT grades and surface roughness Ra for common machining methods: roughing, finishing, grinding, honing, lapping, and more. Includes typical applications.
Interactive engineering material selection wizard. Answer 5 questions about load type, manufacturing process, environment, strength, and weight — the system recommends the best materials and explains why.
Reference tables for hex nuts (DIN 934), plain washers (DIN 125), spring washers (DIN 127) and large washers (DIN 9021) — inner/outer diameter, height, wrench size for M3–M24.
Riveted joint strength check per general machine design principles. Calculates rivet shear, plate bearing and net section stresses with PASS/FAIL verdict.
Shear stress τ distribution across cross-section. Rectangle, solid circle, hollow circle and I-profile. Shows τ(y) diagram, maximum and average stress with PASS/FAIL check.
Calculate maximum deflection, reactions and bending moment for simply supported beams with uniform and point loads. Checks deflection limit L/250 per EC3.
Spur gear basic geometry per ISO 21771. Pitch, tip and root diameters, base circle, centre distance, contact ratio. Supports standard and profile-shifted gears.
Reference database of stainless steel grades — austenitic, ferritic, martensitic, duplex and PH. EN designation, W.Nr., AISI, mechanical properties and PREN.
Cross-reference tool for steel grade designations. Search by any standard — ČSN, EN, DIN, W.Nr. or AISI — and find all equivalents instantly.
Achievable hardness for 20 common Czech/EN steels: delivery condition, after quenching and after tempering. Filter by steel category or heat treatment method.
Section properties table for standard steel profiles: IPE, HEA, HEB, UPN, and equal-leg angles (L). Dimensions and cross-section data per EN 10034 / EN 10056.
Reference database of structural steel grades S235 to S460 per EN 10025. Yield strength by thickness, sub-grades, EC3 design values and material constants.
Surface roughness converter and reference. Ra ↔ Rz ↔ N-grade per ISO 1302. Typical values for turning, milling, grinding, casting and other manufacturing processes.
V-belt drive calculator: transmission ratio, belt speed, belt length, wrap angles, tight/slack side tensions, shaft load and belt sag. Supports SPZ, SPA, SPB, SPC profiles.