This article covers PFU HHKB Professionalシリーズ キートップセット 日本語配列 無刻印 墨 PD-KB420KTBN.

Overview

The PFU HHKB Professional Series Keycap Set PD-KB420KTBN is a replacement keycap kit designed specifically for Japanese-layout HHKB models. This set features blank (unprinted) keycaps in black ink color, providing a clean, minimalist appearance and eliminating any distraction from printed legends. It includes 69 keycaps covering the full Japanese layout, along with a dedicated keycap puller and an instruction manual. Since these are the same material and profile as the original caps, the typing feel remains identical to stock HHKB keyboards.

Connectivity & Compatibility

Compatible models: HHKB Professional JP, HHKB Professional JP Type-S, HHKB Professional BT, HHKB Professional HYBRID Type-S, and HHKB Professional HYBRID (all Japanese layout versions). Direct fit onto electrostatic capacitive switches; no soldering or modification required. * Not compatible with English/US layout HHKB models or any other keyboard brand.

Product Info

Released around June 2022 by PFU, this keycap set is a core accessory for HHKB owners. It is positioned as a replacement part that maintains the original quality and feel. The kit contains 69 keycaps, a puller, and an instruction sheet. Warranty follows PFU's standard accessory policy. It is available at retailers like and other electronics stores, with a typical price around ¥7,000–¥8,000.

Best Use Cases

Custom keymap users: If you have remapped your HHKB, blank caps help break the habit of looking at legends, accelerating your workflow. Minimalist enthusiasts: The blank, uniform black look creates an elegant, distraction-free desk setup. Long-time owners with worn keycaps: Replace shiny, faded, or dirty caps without changing the typing feel or switch characteristics. Who should avoid: Anyone who needs printed legends for reference, or who owns a non-Japanese HHKB model. Also not suitable for users who want different keycap profiles or materials (e.g., SA, OEM, or PBT with dye-sub).

Product Disclosure (Amazon)

  • Manufacturer: HHKB
  • Seller: PFUダイレクト
  • Fulfilled by: PFUダイレクト
  • ASIN: B09XZZVPMF
  • Note: This article covers a manufacturer-made product based on Amazon listing details.