Metric Hex Key Dimensions (ISO 2936)
🔧 Metric Hex Key Size Calculator (ISO 2936 Standard)
📘 Overview
This calculator provides detailed dimensional data for metric hexagon socket keys, commonly known as Allen keys, in accordance with ISO 2936 and DIN 911 standards. These tools are essential for driving socket head cap screws in mechanical assemblies, offering compact form factors and high torque capabilities.
Using the dropdown menu, you can select the nominal key size (ranging from 0.7 mm to 36 mm) to view all associated dimensional tolerances, including:
- F: Hex width across flats
- C: Hex width across corners
- S: Length of short arm
- L: Length of long arm
- R: Radius of bend
- K: Chamfer max
📐 Dimensions Explained
| Symbol | Description |
|---|---|
| F | Width across flats – determines the size of hex socket and wrench fit |
| C | Width across corners – important for socket design and strength |
| S | Short arm length – typically used for high-torque applications |
| L | Long arm length – provides better reach in recessed fasteners |
| R | Minimum and maximum bend radius – affects durability and stress concentration |
| K | Maximum chamfer – affects insertion and engagement precision |