Haimu SW-X MP 45g
The Haimu SW-X MP 45g is a metal-pole tactile switch with a POM housing and UPE stem. Consistent, poppy bottom-out and satisfying feel. Full review.
How it feels
Feel ratings not yet recorded for this switch.
How it sounds
Full review
Quick Summary
The Haimu SW-X MP 45g is a tactile switch built around a metal-pole bottom-out: a metal-tipped UPE stem striking a metal pole inside a POM housing. The headline is the sound: a clean, poppy bottom-out that stays remarkably consistent from build to build, paired with a genuinely satisfying tactile bump. It’s a strong pick for tactile fans who want character and acoustic stability without diving into a full tuning project.
Specs and Feel
This is a medium-weight tactile: 45g actuation building to a 62g bottom-out, on a 62g 18mm spring. Pre-travel runs the standard 2.0mm with a slightly short 3.6mm total travel, so the keystroke feels tight and purposeful rather than long and mushy. The tactile bump is well-defined and satisfying, present enough to register clearly on every press without dragging into the kind of aggressive grind that fatigues your fingers.
The defining trait is the metal pole. Instead of plastic-on-plastic, the metal-tipped stem meets a metal pole at the base of travel, which gives the bottom-out a tighter, more uniform pop. It reads as an acoustic innovation rather than a gimmick: the sound holds together across plates and cases where plastic poles tend to vary. In some lighter builds the bottom-out can skew bright and high-pitched, but in a typical foam-treated board it settles into a pleasant blend of high and low, and the top-out is just as crisp. The POM housing keeps things smooth out of the box, with minimal scratch and stem wobble kept in check.
Tuning
There’s little homework here. The switch arrives factory-lubed and performs well stock, so most builders can drop it in and go. If your case leans toward the bright side, dampening foam or a softer plate tames the high-pitched edge of the metal bottom-out more effectively than any switch-level lube.
Verdict
Buy it if you want a tactile switch with a distinctive, consistent acoustic signature and a clean medium-weight feel, especially if you’re tired of plastic-pole bottom-outs that change personality in every build. It’s also an easy recommendation for anyone who prefers a no-fuss, lube-it-and-forget-it experience. The only caveat is that very minimal builds can over-emphasize its brightness, so pair it with a touch of foam if you’re chasing a deeper signature.
Frequently asked
What makes the metal-pole bottom-out special?
A metal tip on the UPE stem meets a metal pole at the base of the keystroke, giving a crisper, more consistent bottom-out sound than an all-plastic pole, and one that stays fairly stable across different builds.
Does the Haimu SW-X MP need lubing?
It ships factory-lubed and feels good stock. Most people can run it as-is; a light hand-lube on the springs only helps if you want to chase the last bit of refinement.
Is 45g too light for tactile typists?
The 45g actuation rises to a 62g bottom-out, so it lands in comfortable medium-weight territory: light enough to stay fast, heavy enough that the tactile event reads clearly.
Compare Haimu SW-X MP 45g against another switch
Stack specs, sound profiles, and feel side by side.