Linear

JKDK × HMX Blossoms Linear Switch

HMX Linear 5-pin Factory Lubed
At a glance

Key specifications

The most important verified numbers for this product, shown before the deeper sections.

42 gfOperating force
3.7 mmTotal travel
LinearSwitch type
5-pinMount
YesFactory lubed
UPEStem material
Deep, creamy, thocky; medium-pitch tendencySound profile
Character

Sound & feel

How this product sounds and feels to type on, described in plain terms.

Sound profile

Retailer descriptions consistently place Blossoms on the deeper, creamy and thocky side of the linear-switch spectrum. Treat this as a directional description rather than a measured acoustic result, because case, plate, keycaps and mounting style can substantially change the final sound.

Typing feel

With 42±2gf actuation, 48±2gf bottom-out and a 22mm extended single-stage spring, Blossoms should feel medium-weight and smooth with a firm but not unusually heavy bottom-out. The 3.7mm total travel shortens the stroke slightly versus common 4.0mm MX-style linears.

Fit & build

Compatibility & build notes

What to check before ordering, and how the build is put together.

Linear 5-pin PCB Mount Factory Lubed UPE Stem

Compatibility

5-pin MX-style footprint. Use with PCBs or hot-swap sockets that support five-pin switches; check boards designed around 3-pin mounting before purchase. Factory lubricated. UniKeys specifies a thin 205g0 coating on stem legs and sliders, with dry-film lubrication on the spring and leaf. 5-pin mount — confirm PCB and plate support for your board.

Build notes

Uses a 5-pin MX-style PCB mount. It can work with hot-swap keyboards whose PCB and sockets support 5-pin MX switches; some boards are designed around 3-pin mounting, so check the PCB layout before installation.

Fit & trade-offs

Decide quickly whether this product fits your build

A strong fit if you want

Smooth medium-weight linear builds / Users who prefer deeper, rounded switch acoustics / 5-pin MX-compatible hot-swap or solder PCBs

Consider alternatives if you prefer

A different switch type

If you need tactile feedback or a silent build, compare other families.

A specific force target

Pick a switch whose operating force matches your preference.

Another build use case

Match the product to how and where you actually type.

Sizing help

How many switches do you need?

Switch count depends on your keyboard's layout. The typical ranges below are a starting point — the exact number depends on the specific model and any extra keys.

60% 61 – 68 keys
65% 66 – 75 keys
75% 81 – 88 keys
TKL 87 – 92 keys
Full-size 104 – 110 keys

Exact switch count depends on keyboard model / layout (and any novelties or extra keys). Always confirm against your board's official key count before ordering.

Product deep dive

Understand the product before you choose it

Focused sections explain the details buyers care about, supported by the product's specification data.

MEDIUM LINEAR

A collaboration linear with measured resistance

JKDK × HMX Blossoms uses 42±2gf actuation and 48±2gf bottom-out to sit between ultralight and heavy linear options.

Its medium weighting and 3.7±0.2 mm travel suit buyers who want a controlled press without moving to a long, full-travel feel.

  • 42±2gf actuation keeps the press moderate rather than heavy
  • 48±2gf bottom-out adds a firmer end to the stroke
  • Sound descriptors are build-dependent, not fixed acoustic measurements
Bottom line: A medium-weight linear with its own collaboration-led direction.
WHY THE DETAILS MATTER

What the construction tells you

Blossoms combines an H3 stem, PA12 top housing, reinforced P4 bottom housing, and factory lubrication. For buyers, the useful takeaway is that it is built around controlled medium-weight travel rather than an ultralight or silent design.

Its deeper, rounded sound direction is a useful positioning cue rather than a guaranteed acoustic result; the surrounding keyboard build remains decisive.

  • PA12 top housing is paired with reinforced P4 bottom housing
  • H3 UPE stem uses a waffle-shaped tip
  • 22mm KOS single-stage extended spring is factory lubricated
What it means: Weighting and 3.7mm travel are the clearer buying signals.
FIVE-PIN FIT

Plan around the locating legs

Blossoms uses a five-pin MX-style footprint. Confirm that the PCB and socket accept its two locating legs before choosing a 10- or 70-switch pack.

Pack choice should follow the actual key count of the build and any spares you want.

  • Five-pin MX-style footprint.
  • 10-switch pack is useful for testing or replacements.
  • 70 switches provide a larger build quantity after fit and key count are confirmed.
Build note: Verify the footprint before selecting quantity.
THE RIGHT BUYER

When Blossoms is the better linear

Choose Blossoms for a medium-weight linear with a slightly shortened stroke and a cautiously deeper, rounded sound direction.

Choose a different linear if you prefer a lighter press, silent damping, or a longer-travel feel.

  • Medium-weight force profile rather than ultra-light actuation
  • 3.7mm travel is a meaningful difference from 4.0mm alternatives
  • It is not a silent switch and does not include acoustic damping
Decision note: Medium weight and 3.7 mm travel are the decision points.
Decision support

Compare JKDK × HMX Blossoms Linear Switch with realistic alternatives

The goal is to make the key trade-offs visible: weight, travel, stock preparation, sound direction, and the type of user each product serves best.

Open full comparison →
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OUTEMULinear
Type
Linear
Linear
Linear
Linear
Operating Force
42 gf
37 gf
45 gf
40
Bottom-out Force
42 gf
50 gf
50
Total Travel
3.7 mm
3.6 mm
3.5 mm
3.3
Sound Profile
Deep, creamy, thocky; medium-pitch tendency
Deep/muted-leaning; build-dependent; not KeebPilot-tested
Crisp, loud, clacky; bright-leaning tendency
Muted, low-noise and office-friendly
Factory Lubed
Yes
Yes
Yes
Yes
Mount
5-pin
5-pin
5-pin
5-pin
Stem Material
UPE
POM
POM
Best For
Structured product data

Detailed specifications

General

Brand
HMX
Switch type
Linear
Mount
5-pin
Factory lubed
Yes

Performance

Operating force
42 gf
Total travel
3.7 mm
Spring
single-stage extended KOS
Sound profile
Deep, creamy, thocky; medium-pitch tendency
Typing feel
Smooth medium-weight linear with firm bottom-out

Construction

Stem material
UPE
Top housing
PA12
Bottom housing
P4 (PA66 + 25% fiberglass)

Compatibility

PCB mount
5-pin
In the box

What's in the box

Exactly what ships with this product. The switch count and color update with the options you select.

Selected pack
0 switches
  • Included switches0 switches
  • Selected color
Product-specific FAQ

Frequently Asked Questions

Straight answers to the questions that most often decide a purchase.

HMX Blossoms is a linear MX-style mechanical keyboard switch designed by JKDK and manufactured by HMX. It uses a 5-pin PCB mount and is factory lubricated. The switch has no tactile bump or click mechanism, so the keypress is intended to remain smooth through the stroke.
The published operating force is 42±2gf, with a bottom-out force of 48±2gf. That places Blossoms in a medium-weight range: lighter than many heavy linears but not as light as switches aimed at extremely low-effort gaming use.
Blossoms is specified with 2.0mm pre-travel and 3.7±0.2mm total travel. The total stroke is therefore slightly shorter than the 4.0mm travel commonly associated with traditional MX-style switches, which can make the end of the press arrive a little sooner.
Yes. UniKeys states that the stem legs and stem sliders receive a thin coat of 205g0, while the spring and leaf use dry-film lubrication. The remaining areas are kept dry, including the bottom housing around the stem pole.
It can work with hot-swap keyboards that use MX-style sockets and provide clearance for a 5-pin switch. Because some boards are designed around 3-pin mounting, check the PCB layout before ordering instead of assuming every hot-swap keyboard accepts the extra locating pins.
UniKeys and Milktooth describe Blossoms as deep, creamy, rounded and thocky. These are subjective sound descriptors, not fixed measurements. The final result can change substantially with the keyboard case, plate, mounting system, foam, keycaps and typing surface.
The switch uses an H3 UPE stem with a waffle-shaped tip, a PA12 top housing and an HMX P4 bottom housing made from PA66 blended with 25% fiberglass. It also uses a 22mm KOS single-stage extended spring.
KeebPilot offers 10-switch and 70-switch packs. Ten switches are useful for testing, spares or small projects. Seventy switches can cover many compact and 65% keyboards, but layouts vary, so count the required switch positions and allow for a few spares before ordering.

Ready to build with JKDK × HMX Blossoms Linear Switch?

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