Iwaki, Japan – October, 2026 – Tungaloy Corporation (President: Satoshi Kinoshita; Headquarters: 11-1 Yoshima Industrial Park, Iwaki City, Fukushima Prefecture) has expanded the range of cutting widths for the JXPS inserts—featuring 3D chipbreakers—in its DuoJust-Cut series. The series delivers particularly strong performance in grooving and parting operations on small parts.
Challenges and Trends
In grooving and parting-off operations for small parts, chips can damage the machined surface and reduce surface finish quality. For this reason, stable chip control performance is required. In recent years, part shapes have become more diverse and more complex. As a result, there is a growing need for a tool series that can support a wider range of part machining applications.
Product Overview
The DuoJust-Cut grooving and parting-off tool series is designed to deliver excellent performance in small-part machining. Its unique high-rigidity clamping mechanism ensures repeatable cutting edge positioning and reliable machining. Four insert sizes—06, 12, 16, and 20—are available according to the maximum parting-off diameter (workpiece diameter). The lineup for each size includes inserts with 3D chipbreakers and ground chipbreakers, covering cutting widths (CW) ranging from 0.6 to 2.0 mm. This enables high-precision machining tailored to a wide range of conditions and workpiece materials.
Benefits and Features
Feature 1: Stable machining through high-rigidity clamping and optimal overhang design
– The unique DuoJust-Cut clamping mechanism provides high rigidity and helps minimize cutting edge runout and chatter during machining.
– Four insert sizes let you optimize tool overhang for the workpiece, improving stability and reliability.
– A wide range of holders, including holders for sub-spindle applications, supports grooving and parting-off of complex-shaped parts and in tight spaces.
Feature 2: JXPS insert with 3D chipbreaker
– The JXPS insert features a unique 3D chipbreaker that effectively manages chip flow and greatly improves chip evacuation across a wide range of workpiece materials.
– Stable chip evacuation helps reduce the risk of damage to the tool and workpiece.
– It also contributes to improving surface finish, helping to eliminate or streamline finishing processes and improve overall efficiency.
Feature 3: Expanded JXPS insert width lineup for a wider range of machining needs
– In addition to the existing lineup, the range has been expanded to include CW = 1.0 mm and 1.5 mm for Size 06, CW = 2.0 mm for Sizes 12 and 16, and CW = 1.5 mm for Size 20.
– The wide selection of cutting widths allows flexible tool applications to various machining conditions and workpiece materials.
Success Stories
IMPROVED TOOL LIFE
DuoJust-Cut’s 1 mm-wide insert with a 3D chipbreaker reduced material waste by 50%, replacing the competitor’s 2 mm-wide insert. The reduced insert width also lowered cutting forces, helping improve part dimensional quality.
| Industry | Engineering |
| Component | Valve |
| Material ISO code |  Stainless steel |
| Work material | SUS304 / X5CrNi18-9 |
| Machine(Spindletype) | CNC Lathe |
| Tool family | Grooving |
| Toolcategory | Parting-off |
| Product name | DuoJust-Cut |
| TSR No. | 5690G |
IMPROVED TOOL LIFE
DuoJust-Cut 3D chipbreaker provided excellent chip control, improving surface finish and reducing defects caused by chips bird-nesting around the toolholder. It also delivered 1.4 times longer tool life.
| Industry | Engineering |
| Component | Washer |
| Material ISO code |  Steel |
| Work material | SUM23 |
| Machine(Spindletype) | CNC Lathe |
| Tool family | Grooving |
| Toolcategory | Parting-off |
| Product name | DuoJust-Cut |
| TSR No. | 5691G |
