ALLEN KEYS

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ALLEN KEYS

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Product Description

Product Specification :

An Allen Key, also known as a hex key or hexagon socket screw key, is a simple, L-shaped tool used to drive bolts and screws with hexagonal sockets in their heads. It is favored for its efficiency, light weight, and ability to reach recessed fasteners where a standard wrench cannot.

1. General Characteristics

Shape: Most commonly L-shaped, featuring a long arm for leverage and a short arm for tight spaces.
Profiles:
- Standard Hex: Flat-cut ends for maximum surface contact and torque.
- Ball End: Features a rounded hexagonal tip, allowing the tool to be used at an angle (up to 25°–30°)—ideal for obstructed areas.
Styles: Available as individual L-keys, T-handles (for speed and grip), folding sets, or socket bits for ratchets.

2. Material & Construction

Feature	Specification
Common Materials	Chrome Vanadium (Cr-V) (standard), S2 Tool Steel (premium/high-torque), or Carbon Steel.
Hardness	Heat-treated to 52–62 HRC (Rockwell) depending on size and material grade.
Finish	Black Oxide (corrosion resistant/anti-slip), Satin Chrome, or Color-Coded (for easy size ID).
Process	Hardened and tempered across the entire length to prevent twisting or snapping.

3. Dimensional Standards

Allen keys are strictly manufactured to international standards to ensure a precision fit (ISO 691):

Metric (ISO 2936 / DIN 911): Common sizes range from 0.7mm to 36mm.
Imperial (ASME B18.3): Measured in inches, ranging from 0.028" to 1".

Common Set Sizes:

Metric: 1.5, 2, 2.5, 3, 4, 5, 6, 8, 10mm.
Imperial: 1/16", 5/64", 3/32", 1/8", 5/32", 3/16", 1/4", 5/16", 3/8".

4. Key Performance Requirements

Torsional Strength: Must withstand high torque without permanent deformation ("twisting"). S2 steel is typically 30% stronger than standard Cr-V for this reason.
Precision Fit: The "Across Flats" (AF) dimension must have a very tight tolerance (often within $+0.00$ to $-0.05$ mm) to prevent stripping the screw head.
Chamfered Ends: High-quality keys have slightly beveled (chamfered) tips to make insertion into the screw head smoother.