OBSF-30-K

1. Overview

The OBSF-30-K is the all-black color variant of Sanwa Denshi's OBSF-30, the dominant 30mm snap-in arcade push button used worldwide. "K" (kuro, 黒) simply designates black in Sanwa's color coding system — the button is mechanically and electrically identical to all other OBSF-30 color variants. The OBSF-30 family is the OEM button in Vewlix, Blast City, and Versus City arcade cabinets (Taito, Sega, Namco), and ships stock in Qanba (Q4 RAF), Hori, and MadCatz FightStick product lines. Black is the most commonly used color in the OBSF-30 range: it is the default/neutral choice for body and frame buttons, for stealth aesthetics, and for all-black fighting game build aesthetics.

2. User Sentiment

The OBSF-30 receives near-universal praise in the fighting game community for its feather-light 55g actuation, short travel (2.53mm total), and consistent tactile response. Focus Attack's black listing carries a 5-star rating across 14 reviews, with users citing "extremely consistent and reliable, returns to 0 faster upon lifting." A community-discussed caveat is the extended post-activation travel — pressing past the switch's 0.85mm operating point all the way to bottom-out can cause accidental input cancellation in some play styles. Reddit's r/fightsticks notes occasional quality consistency concerns (some units "feel loose and squeaky"), though this appears related to OEM fightstick sourcing rather than individually purchased buttons. Compared to competitors, Digital Key Italy describes them as "quieter and softer to pressure than Edierre, shorter stroke than Baolian." A Japanese Affilabo.com review measured the standard button at ~10dB louder than the silent OBSFE-30 variant, noting the high-pitched plastic clack can be problematic for streaming or voice chat but is generally masked by game audio.

3. Real-World Applications

Black is by far the most common OBSF-30 color in Japanese arcade cabinets and is the default color in Qanba Q4 RAF (which ships with "Authentic Sanwa BLACK Pushbuttons OBSF30K"). Arcooda explicitly names the OBSF-30 as "our preferred choice in Arcooda arcade machines." Beyond fighting games and MAME/RetroPie builds, the OBSF-30 has appeared in DJ controller modifications (referenced on DJ Tech Tools forum), 3D-printed hitbox designs (Printables.com), and even industrial/lab supply catalogues (AS-ONE Axel, Chip1Stop, MonotaRO Japan) — confirming the button's broad recognition as a standard. Mac Japan in Akihabara is the primary in-person retail source in Japan, with Biccamera, Yodobashi Camera, Sofmap, and Tsukumo also stocking it through mainstream electronics retail chains.

4. Technical Specifications

• Type: 30mm snap-in push button (ハメ込み式)
• Internal switch: SW-68 (non-clicking microswitch, 1 circuit / 1 contact)
• Actuation force: ~55g (operating position 0.85mm)
• Total travel: 2.53mm; total travel force ~81g
• Mounting hole: φ30 ± 0.1mm
• Max panel thickness: 3.7–3.9mm (varies slightly by source; designed for metal 2–4mm)
• Terminal: 2.8mm / .110" Faston quick-connect spade terminals
• Overall diameter: ~33mm
• Weight: ~12g
• SW-68 electrical rating: DC 12V / 100mA; insulation resistance DC 250V / 50MΩ; tested to 10,000,000 cycles at 5VDC / 10mA; -20°C to +60°C operating range
• Color code: K = kuro (black); all-black body and plunger
• Cleaning: Neutral detergent only; avoid high-concentration alcohol/solvents

5. Ordering & Compatibility

Retail price ranges: $1.65–$3.25 USD / €2.63–€2.65 / £2.25–£2.70 / ¥253–¥498 JPY depending on retailer and region. Commonly sold individually and in 6/8/12-packs. Snap-in compatible with all panels 2–4mm thick; lateral plastic hooks also grip thicker wooden panels (Arcade 1UP etc.) with optional vinyl glue. Terminals are standard 2.8mm Faston — no soldering required. Compatible with MadCatz FightStick line, Qanba Fightsticks, Hori Fightsticks, and any 30mm-panel arcade cabinet. The SW-68 microswitch is replaceable; Focus Attack offers a silencer foam washer add-on for +$0.10. Related variants: OBSF-30-K/DH (black rim, grey plunger), OBSF-30-K/DB (black rim, dark blue plunger), OBSF-30-K/R, K/G, K/Y, K/P, K/B, K/VER, K/VIO, K/MB, K/O. Silent upgrades: OBSFS-30 (first-gen foam pad, slightly mushy feel) and OBSFE-30 (second-gen elastomer cap, near-identical feel, ~10dB quieter).

6. Known Issues

The post-activation over-travel (button continues ~1.7mm after switch fires) is the most cited behavioral concern — players who bottom-out on every press may trigger unintended second contacts or note the button "hurts when bottomed out" (Focus Attack review). Locking tab breakage during installation is possible if excess force is applied; Canadian Joysticks explicitly warns this voids warranty. Occasional batch-to-batch feel inconsistency is noted on r/fightsticks, likely a supply chain variability issue rather than a design flaw.