Built to Adapt, Engineered to Perform
FK One Adjust pushes machine engineering forward with patent-pending stroke adjustment technology and a fully reimagined, artist-driven build.
Change your stroke on the fly in seconds—from 2.0mm to 5.0mm in 0.5mm increments. This is adaptability in motion, built directly into the frame, so you can have versatility with no limitations. FK One Adjust eliminates the need to juggle multiple machines or cams. Move from heavy packing to delicate detailing in one continuous workflow, with precision you can feel.
This machine boasts real innovation that delivers: engineering evolution is at the heart of what makes FK One Adjust so great. The stroke adjustment system operates with mechanical precision, letting you fine-tune responsiveness mid-session without powering down—something no other adjustable stroke system allows.
Designed with artists at every stage of development, this machine is an artist-first powerhouse. Every mechanical choice was made to deliver consistent torque, clean transfer, and stable performance across every style.
An upgraded digital display keeps you in total control. View your output in volts or hertz—your choice. Hertz gives a true frequency readout of needle movement per second, offering the most accurate insight into performance possible. That’s engineered for full visibility and control.
And because FK builds machines to outlast your schedule, the FK One Adjust is built to last Every component is tested for endurance and supported by FK’s global service network.
The FK One Adjust’s custom engine is a true mechanical breakthrough. A fixed-stroke cam drives a precision paddle, while a rotating slider moves closer to or farther from the paddle’s center to adjust stroke length with absolute accuracy. The result: reduced friction, less wear, and consistent motor load across every stroke.
This is engineering that doesn’t quit: a first-of-its-kind system built to keep your workflow uninterrupted and your performance unmatched.
HOW THE STROKE ADJUSTMENT WORKS
The FK One Adjust features an innovative custom engine that redefines adaptability. A fixed-stroke cam connects to a precision paddle, while a rotating slider adjusts stroke length by moving closer to or farther from the paddle’s center. This design reduces friction and wear, keeping performance consistent session after session.
A first-of-its-kind system built to keep your flow uninterrupted and your performance unmatched.
Key Features:
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Machine Size: 152mm x 38mm
- Weight with Battery: 244g (8.6oz) w/ 18500A Battery / 268g (9.5oz) w/ 18650A Battery
- Features patent-pending adjustable stroke technology (adjust your stroke without powering down)
- Upgraded digital display screen: shows power output in volts or hertz according to your preference
- Stroke Range: 2.0mm up to 5.0mm
- Equipped with an ergonomic grip for maximum comfort
- Compatible with other FK Irons modular grips
- Features a brushed motor
- Operating Range: 5V–12V (80Hz–180Hz) with precise 0.2V / 10Hz adjustments
- Increment/Decrement Voltage Interval: 0.5V or 0.2V
- Maximum Output Current: 1A
Battery Specifications:
- Comes with two drop-in, rechargeable Panasonic batteries + 2 caps
- 18500A Battery Life: ~5.5 Hours (dependent on settings + operating parameters)
- 18650 Battery Life: ~6.5 Hours (dependent on settings + operating parameters)
- 18500A Battery uses shorter cap → 0.25” depth
- 18650A Battery uses longer cap → 0.75" depth
