Turning Inserts
TNMG Carbide Turning Inserts
Negative 60° triangular (trigon) turning inserts in ISO 1832 standard sizes — a long, strong cutting edge for heavy roughing and multi-directional turning of steel, alloy steel and cast iron.
Product Overview
TNMG inserts are negative 60° triangular (trigon) indexable turning inserts with a 0° clearance angle, available in standard ISO sizes TNMG160404 / 160408 / 160412 and the TNMG2204 series. The triangular geometry delivers a longer cutting edge than an 80° diamond insert of the same inscribed circle, which is why TNMG is a common choice for heavy depth-of-cut roughing and multi-directional turning. Two-sided negative design gives 6 cutting edges per insert (3 per side), keeping cost per edge low without sacrificing edge strength on carbon steel, alloy steel, stainless steel and cast iron.
Key Features
- 6 cutting edges per insert (3 per side, two-sided negative design) — economical cost per edge
- Longer cutting edge than 80° diamond (CNMG) inserts at the same inscribed circle — more engaged edge length for heavy depths of cut
- Negative geometry with 0° clearance for maximum edge strength in roughing operations
- CVD multilayer coating for wear resistance and thermal stability; PVD options for stainless steel
- Edge passivation reduces chipping and extends tool life
- Full size range: TNMG1604 and TNMG2204 series
- Custom grades and private-label packaging available
Applications
Factory-direct — produced in our own carbide plant
ISO 1832 dimensional compliance, batch inspected
OEM / ODM support for distributors and brands
Application support for grade and parameter selection
Technical Specifications
| Item | Specification |
|---|---|
| Insert Shape | 60° Triangular (T type) trigon, negative geometry |
| Standard Sizes | TNMG160404 / TNMG160408 / TNMG160412 / TNMG220408 / TNMG220412 (ISO 1832) |
| Inscribed Circle (IC) | 9.525 mm (16 series), 12.7 mm (22 series) |
| Thickness (S) | 4.76 mm |
| Nose Radius (r) | 0.4 / 0.8 / 1.2 mm |
| Coating | CVD (MT-TiCN + Al2O3 + TiN) / PVD / Uncoated |
| Applications | External & internal turning, roughing, facing, multi-directional turning, profiling |
| Workpiece Materials | Carbon steel, alloy steel, stainless steel, cast iron |
| MOQ | 10 pcs (standard sizes) |
| Lead Time | 3-7 days standard, 15-30 days custom |
* Specifications subject to change. Contact us for the current datasheet.
FAQ
Questions Buyers Ask
What does TNMG stand for?
Per ISO 1832: T = triangular shape with a 60° included angle, N = negative clearance angle (0°), M = tolerance class (medium), G = chip breaker / clamping type. For example, TNMG160408: inscribed circle 9.525 mm, thickness 4.76 mm, nose radius 0.8 mm.
What is the difference between TNMG and CNMG inserts?
Shape is the main difference: TNMG is a 60° triangle with 3 cutting edges per side (6 total, two-sided), while CNMG is an 80° diamond with 4 edges per side (8 total). For the same inscribed circle, the TNMG cutting edge is longer, so it engages more edge length at heavy depths of cut — a common choice for roughing and multi-directional turning. CNMG offers more indexable corners for general-purpose turning. Both are negative, two-sided inserts.
Which nose radius should I choose — 160404, 160408 or 160412?
The last two digits are the nose radius: 04 = 0.4 mm (finishing, light cuts), 08 = 0.8 mm (general purpose), 12 = 1.2 mm (roughing, heavy cuts, stronger edge). If you are not sure, 160408 is the typical starting point.
Which grade should I use for carbon steel, alloy steel and cast iron?
For carbon and alloy steel (P group) and cast iron (K group) at higher speeds, CVD-coated grades (MT-TiCN + Al2O3 + TiN) give the best wear resistance and thermal stability. For stainless steel (M group), PVD-coated grades with sharper edges reduce work hardening and built-up edge. Send us your material and operation and we will recommend a grade.
Can TNMG inserts be used with my existing tool holders?
Yes — TNMG inserts fit standard negative tool holders for the same ISO seat, such as MTJNR / MTGNR / MTFNR / PTTNR / PTGNR series holders for TNMG 1604 and TNMG 2204 inserts. Check the holder seat against the insert size and you can drop them in without changing setup.
Do you offer private label for TNMG inserts?
Yes — OEM/ODM with private-label packaging, custom grades and laser marking per your specification. Standard sizes MOQ 10 pcs.
APPLICATIONS
Where It's Used
Typical machining operations and workpiece materials for TNMG Carbide Turning Inserts. Contact us with your operating parameters for grade selection support.
Heavy roughing of steel and alloy steel shafts
Multi-directional turning (longitudinal, facing, profiling)
External turning of carbon steel and alloy steel
Cast iron machining
Internal bore turning
Semi-finishing with light finishing cuts (smaller nose radii)
Interested in TNMG Carbide Turning Inserts?
Factory-direct pricing, OEM/ODM options and lead times — send your spec and volume, get a quote within 24 hours.