# Mechanical Tool Hub (MTH)

> Mechanical Tool Hub (https://mechanicaltoolhub.com) is a high-precision, client-side mechanical engineering calculation platform. All tools run 100% in the user's browser using Vanilla JavaScript with zero server latency, no data collection, and zero tracking of engineering calculations.

## Core Engineering Capabilities

- **100% Client-Side Engine:** All engineering calculations, matrix evaluations, and tolerance lookups run directly in the browser using Vanilla ES6+ JavaScript. No calculations, parameters, or design data are transmitted to external servers.
- **Strict Adherence to International Standards:** Calculators implement authentic industry standards including VDI 2230 (High-strength bolted joints), ASME PCC-1 (Bolted flange joint assembly), ISO 898-1 (Mechanical properties of fasteners), ISO 286-1/-2 & ANSI B4.1 (Fits and limits of tolerances), ISO 281 (Rolling bearing dynamic load ratings and rating life), and ISO 10816 (Mechanical vibration evaluation).
- **Interactive 2D CAD Assembly Blueprints:** Advanced visual calculators render authentic 2D vector CAD schematics with 3D metallic bolt heads, helical thread teeth profiles, cross-hatched clamped plates, and complete $T_1, T_2, T_n, P$ stackup dimension chains directly in SVG.
- **Centralized Engineering Materials Database (`materials.js`):** Unified properties for structural steels, stainless steels, aluminum alloys, titanium, brass, and plastics. Contains real-world values for Yield Strength ($R_{eH}$ / $R_{p0.2}$), Ultimate Tensile Strength ($R_m$), Young's Modulus ($E$), Poisson's ratio ($\nu$), Shear Modulus ($G$), Density ($\rho$), and Thermal Expansion ($\alpha$).
- **VDI 2230 & ASME PCC-1 Fastener & Friction Library:** Built-in fastener property classes (Metric 8.8, 10.9, 12.9; SAE Grade 2, 5, 8; ASTM A325, A490, A193 B7) and empirical friction coefficients ($\mu_{thread}$, $\mu_{bearing}$) across surface conditions (Dry, Lightly Oiled, Moly Disulfide, Waxed, Anti-Seize Paste).
- **Zero-Reload Multilingual Localization:** Instant client-side switching across 4 major engineering languages: English (`en`), German (`de`), French (`fr`), and Spanish (`es`).

## Core Calculators & Engineering Hubs

### Fasteners & Bolting Suite
- [Bolt Torque & Preload Calculator (VDI 2230 / ASME PCC-1)](https://mechanicaltoolhub.com/fasteners/bolt-torque-preload-calculator/): Calculates tightening torque ($M_A$), clamp load preload ($F_M$), thread torque ($M_G$), bearing torque ($M_K$), yield utilization ($\nu$), and elastic curve with friction scatter envelope ($\pm 15\%$). Includes 2D CAD assembly blueprint and live stackup dimensioning.

### Fits, Tolerances & Machining
- [Fits & Tolerances Calculator (ISO 286 & ANSI B4.1)](https://mechanicaltoolhub.com/fits-tolerances/): Computes fundamental deviations, tolerance zones (IT grades IT01 to IT18), minimum/maximum clearance, and transition/interference fits for shafts and bores across standard diameter ranges.

### Sheet Metal & Fabrication Suite
- [Sheet Metal Calculators Hub](https://mechanicaltoolhub.com/sheet-metal-calculators/): Complete portal for sheet metal fabrication, forming, and blank development.
- [Bend Allowance & Bend Deduction Calculator](https://mechanicaltoolhub.com/sheet-metal-calculators/bend-allowance-calculator/): Calculates neutral axis shift ($K$-factor), bend allowance ($BA$), bend deduction ($BD$), and flat blank unfolding lengths for air bending and bottoming.
- [Press Brake Tonnage Calculator](https://mechanicaltoolhub.com/sheet-metal-calculators/press-brake-tonnage-calculator/): Calculates required bending force in metric tons / US tons based on material tensile strength, sheet thickness, bend length, and $V$-die opening width.
- [Mild Steel Sheet Weight Calculator](https://mechanicaltoolhub.com/sheet-metal-calculators/sheet-weight-calculator/): Precise mass and weight calculations across standard sheet sizes, custom geometries, and material densities.
- [Sheet Metal Gauge to MM Conversion Chart](https://mechanicaltoolhub.com/sheet-metal-calculators/gauge-to-mm-chart/): Standard reference charts for Brown & Sharpe, Birmingham, and Manufacturers' Standard gauges.

### Bearings & Rotating Machinery
- [Bearing Tool Hub](https://mechanicaltoolhub.com/bearing-calculators/): Dedicated calculation suite for ball and roller bearings.
- [Bearing $L_{10}$ & $L_{10m}$ Life Calculator (ISO 281)](https://mechanicaltoolhub.com/bearing-calculators/l10-life-calculator/): Basic rating life ($L_{10}$) in hours and revolutions, and modified life ($L_{10m}$) incorporating contamination factors ($e_C$) and viscosity ratios ($\kappa$).
- [Shaft & Housing Bearing Fits Calculator (ISO 286)](https://mechanicaltoolhub.com/bearing-calculators/bearing-fits-calculator/): Optimal fits and tolerance classifications for bearing inner rings (shaft) and outer rings (housing).

### Vehicle Dynamics & Kinematics
- [Chassis & Suspension Calculator](https://mechanicaltoolhub.com/chassis-calculator/): Double wishbone and multi-link geometry, roll center height, instant center, anti-dive, anti-squat, and camber curve analysis.

### Programmatic Engineering Unit Converters
- [Engineering Unit Converters Hub](https://mechanicaltoolhub.com/converters/): Over 13,000 programmatic high-precision conversion pairs.
- [Torque Converters](https://mechanicaltoolhub.com/converters/torque/): $\text{N}\cdot\text{m}$, $\text{lbf}\cdot\text{ft}$, $\text{lbf}\cdot\text{in}$, $\text{kgf}\cdot\text{m}$, $\text{cN}\cdot\text{m}$.
- [Pressure & Stress Converters](https://mechanicaltoolhub.com/converters/pressure/): $\text{MPa}$, $\text{psi}$, $\text{bar}$, $\text{kPa}$, $\text{N/mm}^2$, $\text{ksi}$.
- [Force Converters](https://mechanicaltoolhub.com/converters/force/): $\text{N}$, $\text{kN}$, $\text{lbf}$, $\text{kgf}$, $\text{dyn}$.
- [Length & Clearance Converters](https://mechanicaltoolhub.com/converters/length/): $\text{mm}$, $\mu\text{m}$, $\text{inches}$, $\text{mils}$, $\text{cm}$, $\text{m}$, $\text{ft}$.

## International Language Directories
- **German (Deutsch):** https://mechanicaltoolhub.com/de/ (Schraubenberechnung, Passungen ISO 286, Blechbiegung, Umrechner)
- **Spanish (Español):** https://mechanicaltoolhub.com/es/ (Pares de apriete, tolerancias, plegado de chapa, convertidores)
- **French (Français):** https://mechanicaltoolhub.com/fr/ (Couple de serrage, tolérances ISO, pliage de tôle, convertisseurs)