Iwaki, Japan – April, 2026 – Tungaloy Corporation (President: Satoshi Kinoshita, Head Office: Iwaki City, Fukushima Prefecture) announces the expansion of its AddMultiTurn series, featuring new low-resistance chip breakers, an extended range of internal turning holders. This lineup enables high-efficiency machining across a wide range of operations, from external to internal machining.

Challenges and Trends
In the machining of automotive parts and general industrial machinery parts, there is a demand for both increased productivity and stable machining. In particular, in the external and internal diameter turning of medium to large workpieces, while the adoption of high-efficiency machining using high feed rates is progressing, challenges remain, such as increased chatter due to high cutting resistance and a decrease in surface finish quality. Furthermore, depending on the workpiece material and machining shape, chip evacuation efficiency in internal diameter machining is often reduced, impacting productivity.
Product Overview
AddMultiTurn is a series of turning tools that, thanks to its innovative insert shape, can handle machining in all directions, including external diameter machining, end face machining, contouring, and high-feed post-turning, all with a single tool. The high-rigidity clamping mechanism ensures high stability even in multi-directional turning and high-feed machining. Furthermore, the square shank holder and PSC holder equipped with an internal coolant supply mechanism ensure reliable coolant supply to the cutting edge, improving chip evacuation, surface finish quality, and suppressing cutting edge wear.

Benefits and Features
Feature 1: Addition of Low-Resistance Chip Breakers
– Newly developed low-resistance TLM and TLF chip breakers reduce cutting resistance by 20% or more
– Suppresses chatter and ensures stable machining even under high feed conditions
– Expanded product lineup enables high-efficiency machining across a wide range of applications
– Low resistance reduces stress on the workpiece and extends tool life
Feature 2: Added AH6225 as the primary recommended grade for stainless steel machining
– Offers an excellent balance of wear resistance and chip resistance, providing high versatility
– The addition of the AH6225 grade enables stable, long tool life across a wider range of workpiece materials
Feature 3: Addition of round-shank holders for internal machining
– Equipped with an internal coolant supply mechanism, delivering coolant four times more efficiently than external supply systems
– Excellent chip evacuation reduces machining issues
– Supports internal machining up to L/D = 3, achieving high-efficiency machining comparable to external machining
Cutting Performance
| Insert | 6C-TOMG250608M-TLM AH6225 |
| Toolholder | ATXOR2525X25-CHP |
| Workpiece material | SUS304/X5CrNi18-9 |
| Cutting speed | Vc = 180 m/min |
| Feed | f = 0.6 mm/rev |
| Depth of cut | ap = 1 mm |
| Machining | Back turning |
| Coolant | Wet |
– 2 times higher productivity and tool life compared to standard ISO inserts, improving unit cost performance.
– 3 times longer tool life when combined with the new internal coolant holder, further reducing cost per unit.
| Insert | 6C-TOMG250608M-TM T9225 |
| Toolholder | A32S-ATXOR25 |
| Workpiece material | SCM440/42CrMo4 |
| Cutting speed | Vc = 200 m/min |
| Depth of cut | ap = 1 mm |
| Tool overhang | L/D = 3 |
| Machining | Back turning |
| Coolant | Wet |
– New internal toolholder performed excellent chip evacuation in back turning.
– 2 times higher productivity and 3 times longer tool life achieved compared to ISO inserts.
Success Stories
IMPROVED TOOL LIFE
New AddMultiTurn TLM chipbreaker extended tool life by 2 times and reduced machining time by 67% through high-feed back turning in stainless steel.
| Industry | Engineering |
| Component | Billet |
| Material ISO code | |
| Work material | SUS316L/316L |
| Machine(Spindletype) | CNC Lathe |
| Tool family | Turning |
| Toolcategory | External turning |
| Product name | AddMultiTurn |
| TSR No. | 35571 |

IMPROVED TOOL LIFE
New AddMultiTurn internal holder extended tool life by 2 times and reduced machining time by 57% through high-feed back turning in internal roughing.
| Industry | Engineering |
| Component | Ring |
| Material ISO code | |
| Work material | SCr420/20Cr4 |
| Machine(Spindletype) | CNC Lathe |
| Tool family | Turning |
| Toolcategory | Internal turning |
| Product name | AddMultiTurn |
| TSR No. | 35431 |




