HMX Poro Linear Switches

The HMX PORO is a linear mechanical switch designed for users who prefer a smooth, consistent keystroke with moderate actuation force options. It suits typists and gamers seeking a straightforward linear feel without tactile bumps or clicks. Available in two actuation force variants, it offers a choice between lighter and heavier keypress resistance, fitting different typing styles and preferences.

Actuation Characteristics

• Short pre-travel of 2.00mm enables quick key registration, supporting fast typing or gaming inputs.
• Total travel of 3.70mm provides a standard keypress depth, balancing speed and comfort.
• Two force options: 37g actuation with 42g bottom-out force, and 45g actuation with 50g bottom-out force, allowing users to select lighter or firmer keypress resistance.
• Force variance of 5 cN indicates consistent feel across keys, reducing finger fatigue during extended use.

Feel and Sound

• Linear stem design delivers smooth, uninterrupted keystrokes without tactile feedback or audible clicks.
• Factory lubrication reduces initial scratchiness, contributing to a quieter and smoother typing experience.
• Sound profile is generally muted, suitable for office or shared environments where noise is a concern.

Build Quality

• Stem made from LY material, which affects durability and smoothness of keypress.
• Top housing constructed from Nylon P3 and bottom housing from Nylon PA30, materials known for resilience and moderate sound dampening.
• Single-stage 22mm spring provides consistent resistance and return force.
• Factory lubed, which can improve smoothness and reduce spring noise (spring ping).

Compatibility

• PCB mount design with 5 pins ensures stable installation on compatible PCBs.
• Supports single LED lighting, allowing basic backlighting customization.
• Unknown if compatible with hot-swap sockets, limiting ease of switch replacement without soldering.

Trade-offs

• Linear feel may be less suitable for users who prefer tactile or clicky feedback.
• Limited LED support restricts advanced RGB lighting setups.
• Unknown long-term durability and sound aging characteristics.
• Potential for slight stem wobble or scratchiness exists but factory lube may mitigate this initially.