FK Irons FK ONE Adjust – Professional Wireless Tattoo Machine
The FK ONE Adjust is FK Irons’ next-generation wireless machine, featuring a patent-pending adjustable stroke from 2.0mm to 5.0mm. With its swap-and-go Panasonic battery system and advanced digital display, it offers total versatility for lining, shading, and color packing in a single device.
FK Irons is one of the world's leading manufacturers that strives to take the tattoo industry to the next level. We break the mold and elevate the tattooing experience with each product. From our revolutionary wireless machine to our first power supply that can virtually give power for all.
FK ONE Adjust: The Evolution of Versatility
The FK ONE Adjust sets a new benchmark in modern tattooing by combining precision engineering and wireless freedom. Designed for artists who refuse to compromise, this machine allows you to transition between different styles without changing equipment or components.
The standout feature is the patent-pending stroke adjustment system: with a simple twist, you can vary the stroke from 2.0mm to 5.0mm (in 0.5mm increments), even while the machine is running.
Powered by two interchangeable Panasonic Li-ion batteries, the FK ONE Adjust ensures an uninterrupted workflow. The enhanced digital display allows for real-time voltage control and can be oriented for both right and left-handed artists, offering maximum control over speed and consistency.
FK ONE Adjust Technical Specifications
• Brand: FK Irons
• Machine Type: Wireless Pen
• Stroke Length: Adjustable (2.0 | 2.5 | 3.0 | 3.5 | 4.0 | 4.5 | 5.0 mm)
• Power System: Dual Panasonic battery system (18500A and 18650A included)
• Battery Life: 5.5 to 6.5 hours (depending on the battery used)
• Voltage Range: 5V – 12V
• Display: Digital (View in Volts or Hertz / Flippable screen)
• Material: 6061 T6 Aircraft-grade Aluminum
• Use Level: Professional
How to Use the FK ONE Adjust
Step 1: Choose and Install Your Battery
Select the 18500A battery for a lighter, more compact setup, or the 18650A for maximum runtime during long sessions. Open the battery compartment at the top of the machine and slide the battery in.
Step 2: Mount the Needle Cartridge
Insert your preferred professional tattoo cartridge into the grip. Push and twist clockwise to lock it into place. The FK ONE Adjust is compatible with all standard universal cartridge systems.
Step 3: Configure the Digital Display
Power on the machine. Hold the power button and arrows simultaneously to switch between Volts (V) and Hertz (Hz). Use the menu settings to flip the screen orientation if you are a left-handed artist.
Step 4: Adjust the Stroke and Needle Depth
Rotate the patent-pending adjustment ring to set your desired stroke (2.0mm – 5.0mm) based on your technique. You can adjust the stroke "on-the-fly" while the motor is running. To set the needle depth, simply twist the grip until the desired needle protrusion is achieved.
Primary Uses by Stroke Setting
• Bold Lining: Stroke settings between 4.0mm and 5.0mm.
• Color Packing: Stroke settings between 3.5mm and 4.5mm.
• Shading & Black & Grey: Stroke settings between 2.0mm and 3.5mm.
• Precision Detail: Constant monitoring via Hertz (Hz) frequency.
Complete Your Setup on IMAXSHOP
Optimize your FK ONE Adjust performance with these recommended professional supplies:
• Professional Tattoo Cartridges: Ensure smooth ink flow and stability with premium membrane cartridges.
• Cohesive Bandage Wraps: Add extra comfort and improve grip during long sessions.
• Premium Tattoo Inks: Pair your machine with world-class pigments for vibrant results.
FAQ – Frequently Asked Questions
Can I adjust the stroke while the machine is on?
Yes, the FK ONE Adjust allows you to change the stroke between 2.0mm and 5.0mm instantly without turning off the motor.
What is the difference between the two included batteries?
The 18500A is shorter and lighter (5.5h runtime), while the 18650A is longer, ideal for extended sessions (6.5h).
Is the screen readable for left-handed artists?
Absolutely. The digital display features a flip function that makes it perfectly readable for all artists in the menu settings.
Does it work with all needle brands?
The FK ONE Adjust is compatible with all standard professional cartridge needle systems.

| Brand | FK Irons |
| Color | Black |