Built to Adapt, Engineered to Perform

FK One Adjust delivers true FK power, unmatched versatility, and an artist-first design that revolutionizes the way you work—for the better.

This is our first machine to introduce patent-pending stroke adjustment technology, allowing you to adjust your stroke from 2.0mm up to 5.0mm in 0.5mm increments.

VERSATILITY WITH NO LIMITATIONS: FK One Adjust adapts to any style or technique, so you don’t have to choose between machines. Take on your boldest linework to your finest detailing, all with this one machine: every stroke you need is already here.

Hits like an FK... every time: Manufactured to deliver consistent FK-quality power consistently every session

Modular Compatibility: Works seamlessly with other FK Irons modular grips.

Premium Brushed Motor: Engineered for consistent performance and smooth power delivery.

Voltage Range: 5V–12V with precise 0.2V adjustments.

Maximum Output Current: 1A

Machine Size: 152mm x 38mm.

Weight:

244g (8.6oz) with 18500A Battery

268g (9.5oz) with 18650A Battery

Dual Rechargeable Panasonic Batteries: Includes two drop-in batteries plus two interchangeable caps.

Battery Life:

~5.5 hours with 18500A Battery (short cap: 0.25” depth)

~6.5 hours with 18650A Battery (long cap: 0.75” depth)

Performance Note: Battery life varies based on voltage, stroke, and operating parameters.

PowerBolt O Rings