HMX Cthulhu switch
The HMX Cthulhu is a linear mechanical switch with PC top housing, P7 bottom housing, and M1 POM stem (standard). It features a 22 mm spring. The 45g actuation occurs at 2mm. The 50g bottom-out occurs at 3.50mm. Factory lubing? Yes! Designed by SULAB. Manufactured by HMX.

Where to buy HMX Cthulhu switches?
Here are some notable keyboard shops offering HMX Cthulhu switches. When available, the prices indicated already include the discount - use the KBDNEWS coupon code at checkout to claim your saving!
Currency:
| Store | Area | Offer | Price | Status | |
|---|---|---|---|---|---|
| ktechs | SG | 4.28 SGD / 10 pcs 5% off, KBDNEWS | 0.33 USD | buy | |
| Lume Keebs | US | 3.33 USD / 10 pcs 5% off, KBDNEW (not kbdnewS) | 0.33 USD | buy | |
| MonacoKeys | DE | 3.42 EUR / 10 pcs 5% off, KBDNEWS | 0.40 USD | buy | |
| SerpentKeys | UK | 3.14 GBP / 10 pcs 5% off, KBDNEWS | 0.42 USD | buy | |
| UniKeys | CN | 3.26 USD / 10 pcs 7% off, KBDNEWS | 0.33 USD | sold out |
Prices, discounts, and stock status are checked regularly; however, changes since the last update cannot be ruled out. Everything here is for informational purposes only. Check the product pages for the latest prices!
HMX Cthulhu data sheet
| Name | HMX Cthulhu |
|---|---|
| Type | linear |
| Footprint | 5-pin |
| Top housing | PC |
| Bottom housing | P7 |
| Stem | M1 POM standard |
| Spring | 22 mm |
| Actuation | 45 g |
| Bottom-out | 50 g |
| Pre-travel | 2 mm |
| Total travel | 3.50 mm |
| Lube | Factory lubing? Yes! |
| Designer | SULAB |
| Manufacturer | HMX |
Comments on HMX Cthulhu switches
HMX Cthulhu is here! Designed in collaboration with SULAB for enthusiasts who love loud, sharp, and clacky typing, it delivers an ultra-clacky, bright sound that stands out on any build. Featuring a smooth M1 modified POM stem and a high-fiberglass P7 bottom housing — the highest fibreglass content HMX has used to date – SerpentKeys.
HMX Cthulhu alternatives
Here are some notable alternatives to the HMX Cthulhu, our reference switch. Competitors with comparable specs across parameters like switch type, housing material, actuation and bottom-out forces and travel distances — even color. Not perfect matches but the closest results in order of similarity.
| Sim. | Similar switches | Comparison | ||
|---|---|---|---|---|
| 91% | HMX Pebble linear, 5-pin, PC/Nylon PA66/POM, 45/50gF, 2.0/3.5mm | Compare | ||
| 91% | Keylist Kitty linear, 5-pin, PC/PA66/HPE, 45/50gF, 2.0/3.7mm | Compare | ||
| 91% | HMX | Sillyworks Hyacinth V2 linear, 5-pin, PC/Nylon/POM, 45/52gF, 1.9/3.5mm | Compare | ||
| 91% | HMX Yogurt V1 45g linear, 5-pin, PC/P5 (40-45% fiberglass)/POM, 45/52gF, 2.0/3.4mm | Compare | ||
| 91% | HMX Yogurt V2 linear, 5-pin, PC/P5 (40-45% fiberglass)/POM, 45/52gF, 2.0/3.4mm | Compare | ||
| 91% | Gateron Lunar Probe linear, 5-pin, PC/Nylon PA66/POM, 45/50gF, 1.8/3.6mm | Compare | ||
| 91% | SW x HMX Garnet linear, 5-pin, PC/Nylon PA66/POM, 45/50gF, 2.0/4.0mm | Compare | ||
| 91% | HMX Lulu Silent linear, 5-pin, PC/PA66 Nylon/POM, 45/52gF, 2.0/3.8mm | Compare | ||
| 90% | BSUN x Zuoce Studio Macaron linear, 5-pin, PC/PA66 (30% glass fiber)/POM, 42/47gF, 2.0/3.6mm | Compare | ||
| 90% | HMX | Sillyworks Hyacinth V2U linear, 5-pin, PC/Nylon/POM, 45/52gF, 1.9/3.9mm | Compare | ||
| 90% | MMD Princess Linear Ultra linear, 5-pin, PC/PA66/LY, 42/48gF, 1.9/3.6mm | Compare | ||
To recap: we were looking for linear mechanical switches possibly with PC top housing, P7 bottom housing, and M1 POM stem (standard). The 45g actuation occuring at 2mm. The 50g bottom-out being at around 3.50mm. Factory lubing? Yes! — similar to the HMX Cthulhu.