FK Irons - ONE Adjust

The FK One Adjust is the tattoo machine for artists who demand maximum flexibility, precision, and power. Engineered for professional tattoo studios and creators who value efficiency, consistency, and total control, it combines true FK performance, refined ergonomics, and a patent-pending stroke adjustment system that redefines modern tattoo machine technology.

Its innovative stroke system lets you adjust from 2.0 mm to 5.0 mm in precise 0.5 mm increments — without powering down. Whether you're executing bold linework, smooth shading, or ultra-fine detailing, the FK One Adjust adapts flawlessly to every tattoo style. One machine. Every technique. Zero compromise.

The upgraded digital display gives you full control over your operating parameters, allowing you to switch between voltage and hertz readouts. The hertz mode displays the exact needle frequency per second, making it an ideal tool for artists who demand absolute precision and repeatable results. With a screen that can be oriented for both right- and left-handed use, visibility is always perfect.

Inside, the FK One Adjust features a precision-engineered motor system that pairs a fixed-stroke cam with a refined paddle and slider assembly. Its constant-load design minimizes friction and wear, ensuring smooth, consistent performance across countless sessions. Combined with a premium brushed motor, the machine delivers the unmistakable FK punch — controlled, powerful, and reliable.

Ergonomics have been carefully refined for long, comfortable sessions. Dual rechargeable Panasonic batteries with interchangeable caps provide excellent runtime, reaching up to 6.5 hours, depending on your settings. The FK One Adjust is built for artists who want a single machine capable of mastering every style with confidence.

A future-ready, ultra-versatile tattoo machine for professionals who refuse to compromise.

Features

• Patent-pending stroke adjustment without powering down
• Stroke range: 2.0 mm to 5.0 mm in 0.5 mm increments
• Dual voltage + hertz display
• Right- and left-hand compatible screen orientation
• Ergonomic grip for long-session comfort
• Consistent FK-quality power and performance
• Fully compatible with other FK Irons modular grips
• Premium brushed motor for smooth, stable output

Technical Specifications

• Voltage range: 5V–12V, adjustable in 0.2V steps
• Maximum output current: 1A
• Dimensions: 152 mm × 38 mm
• Weight: 244 g with 18500A battery / 268 g with 18650A battery

Battery system:

• Two rechargeable Panasonic drop-in batteries
• Approx. 5.5 h runtime (18500A) / approx. 6.5 h (18650A)
• Runtime varies depending on voltage, stroke, and operating Parameters

• FK Irons ONE Charcoal
• 2 Panasonic batteries
• Dual battery charging station
• Short- & Long-Cap
• Travel case