HMX FJ400 vs. HMX Xinhai (Heavy)
An in-depth look at the HMX FJ400 and the HMX Xinhai (Heavy) switches—which one is the best fit for you?
Overview
When it comes to choosing the right mechanical keyboard switch for your typing experience, both the HMX FJ400 and the HMX Xinhai (Heavy) stand out as compelling options in the linear switch category. The FJ400 is celebrated for offering a balanced sound profile, making it an ideal choice for those who seek versatility across different tasks—from gaming to typing—without overpowering noise. In contrast, the Xinhai (Heavy) caters to users who appreciate a unique acoustic quality, thanks to its PA12 top housing and POM stem that contribute to a distinctively crisp, higher-pitched resonance and a softer overall acoustics profile. While the FJ400 provides a reliable middle ground for a broad audience, the Xinhai (Heavy) appeals to enthusiasts who prefer a more sophisticated sound and performance character in their typing experience. However, let's dive in a bit deeper beyond generalities so you can best decide on the ideal switch for your needs.
By the numbers
Technical specifications
Actuation force
50g
Actuation force
55g
Bottom-out force
58g
Bottom-out force
62.5g
Pre-travel
2.00 mm
Pre-travel
2.00 mm
Total travel
3.80 mm
Total travel
3.40 mm
Factory lubed
Yes
Factory lubed
Yes
Stem construction
Standard
Stem construction
Standard
Stem material
T2
Stem material
POM
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
22mm single-stage spring
Housing materials
The housing materials of the HMX FJ400 and the HMX Xinhai (Heavy) showcase both similarities and differences that contribute to their respective sound profiles and tactile experiences. The FJ400 features a POM top housing, known for producing a unique sound with deeper, more muted qualities. In contrast, the Xinhai (Heavy) uses a nylon top housing, a material that is celebrated for its ability to create a fuller sound profile, attributed to its relatively softer and more sound-absorbing characteristics. This fundamental difference in top housing materials suggests that the FJ400 may have a more distinct auditory presence on key release, while the Xinhai (Heavy) could generate a rounder and more enveloping sound during both press and release.
Both models utilize nylon for their bottom housings, underscoring the classic and widely appreciated qualities of this material in mechanical switches. The nylon bottom housing plays a critical role in defining the overall sound and feel of each switch, with its soft plastic composition contributing to a deeper, fuller sound profile. This similarity indicates that regardless of the differences in top housing materials, users would experience a consistent tonal foundation when bottoming out each switch. The impact of the bottom housing is particularly pronounced, thus enhancing the tactile sensation and sound quality during key presses for both switches.
While the FJ400 and Xinhai (Heavy) differ in top housing materials, thereby influencing their respective release sound profiles, they converge in their use of nylon for the bottom housing. This unity in material choice ensures that both switches will likely deliver a satisfying key feel and sound, providing a fuller auditory experience during each key press due to the absorption properties of nylon. Ultimately, users can expect to achieve similar results in terms of sound depth and richness when engaging with these switches, highlighting the nuanced interplay between top and bottom housing materials in the design of mechanical switches.
Weight
The HMX FJ400 linear switch and the HMX Xinhai (Heavy) linear switch exhibit differences in their actuation and bottom out forces. The FJ400 has an actuation force of 50 grams and a bottom out force of 58 grams, while the Xinhai (Heavy) requires a slightly higher actuation force of 55 grams and a bottom out force of 62.5 grams. This means that the FJ400 is the lighter option, making it potentially more suitable for prolonged typing or gaming sessions, as users may find it less fatiguing. Conversely, the Xinhai (Heavy), with its greater actuation and bottom out forces, provides a firmer push feel, appealing to those who prefer a more substantial typing experience. Overall, the differing actuation and bottom out forces of these switches cater to varying preferences in typing feel, with the FJ400 being the lighter choice for those seeking ease and comfort, while the Xinhai (Heavy) offers a heavier and more pronounced key press for users who favor a stronger tactile response.
Travel distance
When comparing the travel distances of the HMX FJ400 linear switch and the HMX Xinhai (Heavy) linear switch, the FJ400 features a travel distance of 3.8 mm, making it the longer option, while the Xinhai (Heavy) offers a shorter travel distance of 3.4 mm. The difference in travel distance signifies a variation in user experience; those who favor quick responsiveness, such as gamers, might lean towards the Xinhai switch for its reduced travel, providing faster actuation. Conversely, individuals who appreciate a more substantial depth might prefer the FJ400, as its longer travel can feel more deliberate and satisfying. This distinction in travel distance reflects a balance between responsiveness and tactile feedback, catering to different preferences in keyboard feel.
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 HMX Xinhai (Heavy) has an MSRP of $3.50 per 10 switches. At Milktooth, we are able to pass on savings to our customers and offer the Xinhai (Heavy) for $2.99.
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
The sound profile of the HMX FJ400 linear switch is characterized by a balanced acoustics that suits a variety of preferences, making it a versatile choice for those who appreciate a consistent auditory experience. In contrast, the HMX Xinhai (Heavy) switch produces a more nuanced sound, thanks to its unique PA12 top housing that enhances the softer acoustic qualities, paired with a POM stem that delivers a distinctively crisp and higher-pitched resonance. While both switches can offer pleasing auditory experiences, the FJ400 leans toward a more even performance across different setups, while the Xinhai (Heavy) injects a level of sophistication and sharpness that can appeal to users looking for an elevated auditory engagement.
When it comes to feel, the FJ400 switch strikes a balance that caters to users who enjoy a good compromise between responsiveness and smoothness, making it approachable for both typing and gaming. On the other hand, the Xinhai (Heavy) switch, being a heavier variant, likely offers a more substantial resistance and tactile feedback, which many seasoned typists prefer, especially for prolonged typing sessions. As such, while both provide smooth linear action, the FJ400 may feel lighter and more forgiving, whereas the Xinhai (Heavy) gives a more robust and deliberate experience.
In conclusion, both the HMX FJ400 and the HMX Xinhai (Heavy) linear switches offer unique attributes that cater to different user preferences. While the FJ400 presents a balanced sound and a generally approachable feel, the Xinhai (Heavy) stands out with its refined acoustic signature and more engaging tactile feedback. Choosing between these two switches depends on whether you're looking for versatility in sound and feel or prefer a more defined and heavier experience. Regardless of your choice, either switch will deliver solid performance, allowing for satisfying typing or gaming experiences.
Conclusion
To conclude, the choice between the HMX FJ400 linear switch and the HMX Xinhai (Heavy) linear switch ultimately hinges on your personal preferences and typing style. If you're looking for a versatile option that strikes a balance between sound and feel, the FJ400 is an excellent choice. With its medium bottom-out force of 58 grams, it provides a satisfying tactile experience that is neither too soft nor overly firm, making it ideal for both casual typing and intense gaming sessions. Its balanced sound profile ensures that you won't disturb those around you while enjoying a pleasant auditory feedback.
Conversely, if you prefer a switch that leans towards a more pronounced tactile response and sound, the Xinhai (Heavy) may be the better fit. With a slightly firmer bottom-out force of 62.5 grams, this switch brings a more robust feel to your keystrokes, perfect for users who appreciate a heavier touch during typing. Additionally, its unique PA12 top housing and POM stem create a distinctive acoustics profile, giving your typing experience a crisp and sophisticated edge. Thus, if you value a more pronounced auditory feedback and a sturdier feel, the Xinhai (Heavy) should be your go-to option. Ultimately, your decision should reflect your typing habits, desired sound profile, and overall experience you wish to achieve with your mechanical keyboard.
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