HMX FJ400 vs. Keygeek Keylin
An in-depth look at the HMX FJ400 and the Keygeek Keylin switches—which one is the best fit for you?
Overview
When choosing between the HMX FJ400 and the Keygeek Keylin, both linear switches offer distinct advantages catering to different preferences. The HMX FJ400 serves as a well-rounded option within the HMX Film switch lineup, known for its balanced sound profile that strikes a harmonious chord between tactile feedback and auditory satisfaction, making it an excellent choice for typists who value a subtle yet enjoyable acoustic experience. In contrast, the Keygeek Keylin leverages new molds that promise a premium typing experience, characterized by rich acoustics and exceptional smoothness; this makes the Keylin a standout for users who prioritize a silky feel and superior sound quality in their keystrokes. While both switches cater to linear switch enthusiasts, their specific qualities can greatly influence the typing experience. However, let's dive in a bit deeper beyond generalities so you can best decide on the ultimate switch for you.
By the numbers
Technical specifications
Actuation force
50g
Actuation force
38g
Bottom-out force
58g
Bottom-out force
48g
Pre-travel
2.00 mm
Pre-travel
2.00 mm
Total travel
3.80 mm
Total travel
3.60 mm
Factory lubed
Yes
Factory lubed
Yes
Stem construction
Standard
Stem construction
Standard
Stem material
T2
Stem material
UPE
Top housing material
POM
Top housing material
Nylon
Bottom housing material
Nylon
Bottom housing material
Nylon
Mount type
PCB (5-pin)
Mount type
PCB (5-pin)
Spring
22mm single-stage spring
Spring
21mm single-stage spring
Housing materials
The housing materials of the HMX FJ400 and the Keygeek Keylin offer a fascinating study in how different plastics influence sound profiles in mechanical switches. In the FJ400, the top housing is constructed from POM (Polyoxymethylene), praised for its capability to create a unique sound that is on the deeper side and relatively muted. This material's hardness contributes to a distinct auditory experience, setting it apart from more traditional housing types. In contrast, the Keylin opts for a nylon top housing, a classic switch material known for producing a fuller and deeper sound that is inherently rounder. The softness of nylon allows it to absorb sound more effectively than POM, which may lead to slightly different acoustic qualities when typing, particularly in how these materials transmit sound upon key release.
Both switches feature a nylon bottom housing, which is significant as it provides a similar foundation for sound production. Nylon's inherent soft characteristics aid in creating a deeper and fuller sound profile for both the FJ400 and the Keylin, emphasizing a muted and more rounded auditory experience. This similarity in bottom housing means that users could expect comparable results in terms of sound feedback, particularly when bottoming out. As the bottom housing influences the sound experienced during key presses, the nylon material's ability to absorb sound will yield a more harmonious acoustic experience in both switches when the keys are fully depressed.
In essence, while the housing materials of the HMX FJ400 and Keygeek Keylin may differ for the top housing—POM versus nylon—the bottom housings share a commonality that shapes the overall sound experience. The muted characteristics of the POM top housing can potentially balance the deeper sound produced by the nylon, providing users with a nuanced auditory experience. Meanwhile, the fully nylon construction of the bottom housings in both switches ensures that regardless of the material differences at the top, users will enjoy a consistent and rich sound profile when engaging with the keys. Thus, despite their different top materials, both switches effectively harmonize through their nylon bottoms, resulting in an engaging typing experience.
Weight
When comparing the HMX FJ400 linear switch to the Keygeek Keylin linear switch, notable differences emerge in both actuation and bottom out forces. The FJ400 features an actuation force of 50 grams and a bottom out force of 58 grams, categorizing it as a medium-weight switch. In contrast, the Keylin offers a lighter experience with an actuation force of 38 grams and a bottom out force of 48 grams. This means that users who prefer lighter switches for extended typing or gaming sessions may lean towards the Keylin for its reduced resistance. Conversely, the heavier actuation and bottom out forces of the FJ400 provide a more substantial typing experience that some users may find satisfying. Overall, while the FJ400 is the heavier option, the Keylin's lighter forces make it more favorable for those prioritizing comfort over a firm push feel.
Travel distance
When comparing the travel distances of the HMX FJ400 linear switch and the Keygeek Keylin linear switch, we find that the FJ400 has a travel distance of 3.8 mm, while the Keylin measures at 3.6 mm. This means that the FJ400 offers a slightly longer travel distance compared to the Keylin. In terms of user experience, those who prefer a more pronounced key press and a feeling of depth might gravitate towards the FJ400, as its longer travel allows for a more substantial tactile sensation. On the other hand, the Keylin's shorter 3.6 mm travel distance may appeal to gamers or users seeking quicker response times due to its reduced travel, allowing for faster keystrokes. Ultimately, the choice between these two switches will depend on individual preferences regarding key feel and responsiveness during use.
Price comparison
Which switch is more bang for your buck?
The HMX FJ400 has an MSRP of $3.50 per 10 switches. At Milktooth, we are able to pass on savings to our customers and offer the FJ400 for $3.29.
The Keygeek Keylin has an MSRP of $3.50 per 10 switches. At Milktooth, we are able to pass on savings to our customers and offer the Keylin for $3.29.
Here at Milktooth, we offer the best prices on switches (on average, 27% lower the competition). In addition, we offer free shipping on orders over $49.00. We also offer free returns and exchanges, so you can shop with guaranteed satisfaction.
That said, while price is an important piece of the puzzle, our opinion is that you should ultimately pick the option that most suits your unique preferences since you’ll be using these switches for years to come. In other words, finding something perfect for you is, in our view, the most important criteria.
Typing experience
When it comes to sound, the HMX FJ400 linear switch is known for offering a balanced sound profile that doesn't dominate the acoustic landscape but still provides a satisfying auditory experience. This makes it versatile for both typing and gaming, as it allows for a pleasant sound without being overly noticeable or disruptive. On the other hand, the Keygeek Keylin switch boasts rich acoustics, delivering a more pronounced audio signature that many enthusiasts appreciate. This may create a more premium feel during use, though the overall sound can vary depending on the keyboard setup and keycap choice, leading to subjective listening experiences with both switches.
In terms of feel, the FJ400 is described as a middle ground in the HMX Film lineup, suggesting an appealing compromise that balances smoothness and tactile feedback without veering too far into either extreme. This makes it an excellent choice for users who prefer a consistent typing experience without overly harsh or soft sensations. Conversely, the Keylin linear switch is celebrated for its exceptional smoothness, offering a luxurious glide that enhances the overall typing experience. Users often find the Keylin provides a feeling of refined precision, which can be particularly satisfying for those who spend long hours typing or gaming.
In summary, both the HMX FJ400 and Keygeek Keylin linear switches bring unique qualities to the table, making them suitable for different preferences and usage scenarios. The balanced sound profile of the FJ400 contrasts with the rich acoustics of the Keylin, while the FJ400’s well-rounded feel offers a nice compromise compared to the smooth elegance of the Keylin. Ultimately, both switches can yield enjoyable results, but your choice will depend on whether you prioritize sound richness or a velvety typing experience.
Conclusion
To conclude, your choice between the HMX FJ400 linear switch and the Keygeek Keylin linear switch ultimately hinges on your personal preferences for typing feel and sound profile. If you enjoy a balanced sound experience and prefer a moderate actuation force, the FJ400, with its 58 grams of bottom-out force, provides stability and a robust feel, making it ideal for those who enjoy a tactile response without overwhelming effort. Its sound profile is characterized as subtle and balanced, which can complement various setups without being overly intrusive. On the other hand, if you lean towards a lighter typing experience, the Keylin, with a 48 grams bottom-out force, offers an exceptional smoothness and a more effortless keypress, perfect for fast-paced typing or gaming sessions. The Keylin's luxurious sound and feel are crafted to enhance your experience and may be especially pleasing if you value acoustics and a premium typing sensation. Ultimately, your decision should reflect your typing style and how you prioritize sound and feel in your mechanical keyboard journey.
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