Omron microswitch

Omron are a major manufacturer of microswitches used in pointing devices.

The most popular microswitch series made by Omron is D2FS:

D2FS-F1-N2

1 - Actuator

None - Pin plunger
L - Hinge lever

2 - Terminals

None - PCB terminals (Straight)
-T - PCB terminals (Self-clinching)
-A - PCB terminals (Right-angled)
-A1 - PCB terminals (Left-angled)

Every microswitch in this series has 0.85N actuation force.

Part number	Keypresses durability (In milions)	Notes
D2FC-3M	3
D2FC-F-7N	5
D2FC-F-7N(MS)	5	Produced for Microsoft
D2FC-F-7N(RT)	?	Produced for Roccat<ref name="d2fcfrt">One of the switches used in a Roccat Kova 2016 mouse. The primary switch (left mouse button) began double-clicking after approx. 2.5M clicks (tracked)</ref>
D2FC-G-7S	5	Produced for Razer
D2FC-F-7N(10M)	10	Initially produced only for Logitech
D2FC-F-7N(20M)	20	First used by Logitech G...S series

After Logitech noticed the problem with D2FC-F-7N (double-clicking) the company introduced -S series, with Omron D2FC-F-7N(20M), rated for 20 milion keypresses, this model is the highest currently produced by Omron and is recommended for switch replacements.