The HMX Longjing S and GAZZEW Boba U4 switches are both standard MX mechanical switches of the tactile breed. They both feature POM stem material, standard stem shape, - g , 45 g actuation, - mm , however, they come with different top housing (PA66 Nylon vs proprietary Gazzew blend), bottom housing (PA66 Nylon vs proprietary Gazzew blend), spring (22 mm single-stage extended KOS vs 14 mm stainless seel), bottom-out force (50 g vs 62 g), total travel (3.70 mm vs 3.60 mm). That said, they are moderately similar. Let's check out this side-by-side specs rundawn with details, availability -- and even current prices -- to figure out which one fits you the best!
The HMX Longjing S is a tactile standard MX mechanical switch with PA66 Nylon top housing, PA66 Nylon bottom housing, and POM stem (standard shape). It features a 22 mm single-stage extended KOS spring. The 45g actuation occurs at 2mm. The 50g bottom-out occurs at 3.70mm. Factory lubing? Yes! Designed by WJBY. Manufactured by HMX. | The GAZZEW Boba U4 is a tactile standard MX mechanical switch with proprietary Gazzew blend top housing, proprietary Gazzew blend bottom housing, and POM stem (standard shape). It features a 14 mm stainless seel spring. The operating force is 45g. The 62g bottom-out occurs at 3.60mm. Factory lubing? Yes! Designed by Gazzew. Manufactured by Outemu. |
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| Name | HMX Longjing S | GAZZEW Boba U4 |
|---|---|---|
| Type | tactile | tactile |
| Footprint | 5-pin | 5-pin |
| Top housing | PA66 Nylon | proprietary Gazzew blend |
| Bottom housing | PA66 Nylon | proprietary Gazzew blend |
| Stem material | POM | POM |
| Stem shape | standard | standard |
| Spring | 22 mm single-stage extended KOS | 14 mm stainless seel |
| Tactile force | - g | - g |
| Actuation | 45 g | 45 g |
| Bottom-out | 50 g | 62 g |
| Tactile bump position | - mm | - mm |
| Pre-travel | 2 mm | - mm |
| Total travel | 3.70 mm | 3.60 mm |
| Lube | Factory lubing? Yes! Stem legs and stem sliders are covered with a very thin coat of 205g0. The spring and leaf are lubed with dry film. Everything else is dry. There is no lube in the bottom housing or anywhere near the stem pole. | Factory lubing? Yes! lightly factory lubed |
| Designer | WJBY | Gazzew |
| Manufacturer | HMX | Outemu |
By tracking prices and in-stock status of 30+ well-known keyboard stores worldwide, we can state that the HMX Longjing S is much more widely available, but the GAZZEW Boba U4 is also available in stores.
Clicking the links below take you to some notable keyboard shops offering HMX Longjing S and GAZZEW Boba U4 switches. When accepted, the prices indicated already include the discount - use the KBDNEWS coupon code at checkout to claim your saving!
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 Longjing S sound test | GAZZEW Boba U4 sound test |
No GAZZEW Boba U4 sound test available. |
Comments on HMX Longjing S switches | Comments on GAZZEW Boba U4 switches |
The HMX Longjing S tactile switch is the successor of the Gateron Longjing tactile switches. Material-wise, these two switches don't differ much, but HMX's light tactile molds make them feel and sound drastically different. Longjing S tactile switch is similar to the HMX K01 tactile switch, which delivers a mid-clacky bottom-out sound; The tactile bump is on the smaller side and similar in size to the Cherry Brown switches – Unikeys. If you're a fan of HMX K01, you'll like these too… primarily because they're pretty much a recolor. Made with a PA66 top/bottom paired with a POM stem. The tactile bump is very light with these, similar to what you would feel with Cherry Browns. Sound wise, very similar if not identical to K01. A clean, crisp clacky sound profile that isn't too loud. No ping, crunching, or any other weird noises. These are some of the best light tactiles HMX offers. Right up there with Yamatake and Valerians. I would highly recommend! – @keyboard_dad. The HMX LongJing Tea S Tactile Switch is the next evolution of the classic Gateron Longjing tactile switches. With HMX’s new tactile molds give the Longjing S a noticeably different feel and sound – LumeKeebs. | The Gazzew Boba U4 Switch combines a smooth tactile feeling with a silent sound – keygem. |
