HMX FJ400 vs. Kailh BCP
An in-depth look at the HMX FJ400 and the Kailh BCP switches—which one is the best fit for you?
Overview
When it comes to choosing the right mechanical keyboard switch, two notable options stand out: the HMX FJ400 and the Kailh BCP, both of which are linear switches catering to different typing preferences. The FJ400 is celebrated for its balanced sound profile, making it an excellent middle ground within the HMX Film switch lineup, ideal for those who appreciate a more neutral auditory experience while typing. On the other hand, the Kailh BCP introduces an innovative take on the beloved Black Cherry Pie switch, offering a creamy, viscous feel that's both elastic and bouncy, complemented by a distinctively poppy and clacky sound that many users find appealing. While the FJ400 may suit those seeking a smoother, quieter typing experience, the BCP is perfect for those who enjoy a bit more tactile feedback and character in their keystrokes. However, let's dive in a bit deeper beyond generalities so you can best decide on the switch that will enhance your typing experience.
By the numbers
Technical specifications
Actuation force
50g
Actuation force
52g
Bottom-out force
58g
Bottom-out force
63.5g
Pre-travel
2.00 mm
Pre-travel
1.40 mm
Total travel
3.80 mm
Total travel
3.50 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
20mm single-staged spring
Housing materials
The HMX FJ400 and Kailh BCP switches utilize different materials for their top housings, which influences their sound profiles. The FJ400 features a POM (Polyoxymethylene) top housing, known for producing a unique and deep sound that is relatively muted compared to other plastics. This creates a distinct auditory experience favored by some typists seeking a lower tone while typing. In contrast, the Kailh BCP utilizes a nylon top housing, a classic choice recognized for producing a deeper, fuller sound. While both materials contribute to a satisfying sound profile, the differences in material properties result in varying degrees of sound clarity and resonance that typists may prefer based on their personal taste.
When it comes to the bottom housings, both the HMX FJ400 and Kailh BCP switches employ nylon, a material known for its softness and sound-absorbing qualities. This similarity means that the bottom-out sound and feel for both switches will share comparable characteristics. The nylon bottom housing absorbs sound effectively, creating that same rounded and dulcet tone. The effect of the bottom housing on the overall typing experience is significant; it is responsible for how the switch feels and sounds when fully pressed down. Thus, regardless of the top housing material, the nylon components in both switches allow for a consistent bottom sound experience and overall tactile feedback.
In summary, while the HMX FJ400 and Kailh BCP share similarities in their bottom housing materials that produce a similar sound signature, their differing top housings result in unique auditory experiences. The POM top of the FJ400 provides a muted response, whereas the nylon top of the BCP elicits a fuller tone. Users can expect a harmonious typing experience influenced by both the housing materials, where the nylon bottom ensures a consistent, deep sound, while the top housing's properties add nuance and differentiation to the overall acoustic performance of the switches. This blend of materials allows for a range of sound profiles that typists can explore based on their preferences for key feel and auditory feedback.
Weight
When comparing the HMX FJ400 linear switch and the Kailh BCP linear switch, we see notable differences 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 force option. In contrast, the Kailh BCP has a slightly heavier actuation force of 52 grams and a bottom out force of 63.5 grams, placing it in the medium-heavy range. As a result, users who prefer lighter switches for prolonged typing or gaming sessions may find the FJ400 more appealing, while those seeking a more substantial feel under their fingers might gravitate towards the BCP due to its heavier actuation and bottom out forces. Therefore, while both switches provide a satisfying typing experience, the HMX FJ400 is the lighter option, and the Kailh BCP offers a firmer push back, catering to different user preferences.
Travel distance
When comparing the travel distances of the HMX FJ400 linear switch and the Kailh BCP linear switch, the FJ400 has a travel distance of 3.8 mm, making it the longer option, while the BCP features a shorter travel distance of 3.5 mm. This difference may cater to varying preferences among users; gamers might favor the Kailh BCP for its quicker response time due to the shorter travel, allowing for rapid key presses. Conversely, those who appreciate a more substantial feel when typing may prefer the HMX FJ400 for its greater depth, which can provide a more satisfying tactile experience. Ultimately, the choice between the two switches will depend on individual comfort and typing style preferences.
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 Kailh BCP has an MSRP of $5.00 per 10 switches. At Milktooth, we are able to pass on savings to our customers and offer the BCP for $4.75.
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
In terms of sound, the HMX FJ400 linear switch is characterized by a balanced sound profile, making it a versatile choice for those who prefer a more neutral auditory experience while typing. This provides a satisfying yet restrained sound that is less likely to be distracting in quieter environments. On the other hand, the Kailh BCP linear switch stands out for its poppy and clacky sound profile—an expressive auditory quality that can be especially enjoyable for users who appreciate more pronounced acoustics. However, it should be noted that the sound produced by any switch can be influenced by factors such as the type of keyboard case and keycap material used.
As for the tactile feel, the FJ400 switch serves as a middle ground within the HMX lineup, suggesting that it offers a smooth typing experience without any jarring interruptions. While specific details about its tactile feedback are not provided, the absence of tactile bumps indicates that it delivers a consistently linear feel. In contrast, the Kailh BCP linear switch is designed with a creamy, viscous, elastic, and bouncy quality, contributing to a unique tactile sensation that can make typing feel more engaging and dynamic. The bounciness of the BCP may appeal to those seeking an energetic typing style, contrasting with the more straightforward nature of the FJ400.
In conclusion, the HMX FJ400 and Kailh BCP linear switches cater to different preferences when it comes to sound and feel. While the FJ400 offers a balanced auditory experience combined with a smooth, linear response, the Kailh BCP enhances the sensory experience with its vibrant sound and bouncy, elastic feel. Ultimately, choosing between these switches will depend on whether you seek a more subdued typing experience or one that is lively and expressive. Regardless of your choice, both switches offer distinct qualities that can enhance your mechanical keyboard experience.
Conclusion
To conclude, when deciding between the HMX FJ400 and the Kailh BCP linear switches, consider your personal preferences and typing style. If you prefer a more balanced sound profile coupled with a medium bottom-out force of 58 grams, the FJ400 would suit you well, offering a smoother typing experience that is versatile for both gaming and typing tasks. On the other hand, if you enjoy a more tactile feedback with a heavier feel, the BCP is an excellent choice. With its bottom-out force of 63.5 grams and a unique creamy, elastic sensation, it delivers a satisfying poppy and clacky sound that enhances the typing experience, especially for those who appreciate auditory feedback. Ultimately, your decision should be guided by what you prioritize in your typing experience—whether it is the harmonious balance of the FJ400 or the engaging and more substantial feedback of the BCP.
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