How do I choose the right carbide insert grade?

Match the ISO grade to your workpiece: P (steel), M (stainless), K (cast iron), N (aluminum/non-ferrous), S (superalloys like Inconel/titanium), H (hardened steel above 45 HRC). Within each ISO group, lower numbers (P05, M15) are harder/more wear-resistant for finishing; higher numbers (P30, M30) are tougher for roughing. See our complete ISO designation guide .

What does CNMG, DNMG, CCMT mean on insert codes?

These are ISO 1832 shape + clearance codes. C=80° rhombic (general turning), D=55° rhombic (profiling), T=triangular, S=square. The 2nd letter is clearance angle (N=0° negative, P=11° positive). The 3rd letter is tolerance (M=standard). The 4th letter is the hole/chip-breaker style.

Should I use coated or uncoated inserts?

Coated inserts (PVD AlTiN, CVD multilayer) extend tool life 5-10× over uncoated and are standard for steel, stainless, cast iron. Uncoated polished carbide is best for soft aluminum (no chip welding) and very light cuts. PCD-tipped inserts are required for high-silicon aluminum and composites.

Which is better — Sandvik, Iscar, Walter, or Kennametal inserts?

All four are top-tier. Sandvik leads in steel turning (GC4325 grade is the benchmark). Iscar wins for stainless production (IC907/IC908). Walter excels at finishing and German aerospace work (Tiger-Tec Gold). Kennametal is strongest in superalloys (Beyond KCS series). See our brand comparison guide .

Are these inserts genuine OEM?

Yes — 100% original from authorized distribution. Counterfeits are common in some online channels and fail unpredictably. Hooguu inserts ship in OEM packaging with manufacturer markings intact.

Category: Insert

How to Choose the Right Carbide Insert

Selecting the correct carbide insert is the single biggest decision affecting tool life, surface finish, and machining cost. Hooguu stocks over 100,000 inserts from Sandvik Coromant, Iscar, Walter, Kennametal, Kyocera, Mitsubishi, TaeguTec, and Seco. This guide gives you the framework to pick right.

Step 1: Match Insert Grade to Workpiece Material (ISO Classification)

The ISO 513 system classifies carbide inserts by application:

P (blue) — Steel and steel castings (1018, 1045, 4140)
M (yellow) — Stainless steel and duplex (304, 316, 17-4 PH)
K (red) — Cast iron, gray and ductile
N (green) — Aluminum and non-ferrous alloys
S (brown) — Heat-resistant superalloys (Inconel, titanium, Hastelloy)
H (gray) — Hardened steel above 45 HRC, requires CBN or ceramic

Step 2: Decode the ISO Insert Designation

Every insert code (e.g. CNMG 12 04 08) encodes shape, clearance, tolerance, hole, size, thickness, and corner radius. The first letter is shape: C=80° rhombic, D=55° rhombic, S=square, T=triangular, W=trigon, R=round. See our complete ISO insert designation guide for full decoding.

Step 3: Choose the Right Coating

Uncoated polished carbide — Best for aluminum, non-ferrous, light cuts
PVD TiAlN/AlTiN — Best for stainless, titanium, hardened steel
CVD multilayer (Al2O3/TiCN/TiN) — Best for high-volume steel and cast iron turning
CBN/PCBN — Best for hardened steel above 50 HRC
PCD diamond — Best for high-silicon aluminum (A380, A356), composites

Step 4: Match Edge Geometry to Operation

Chip breaker codes (M, R, F suffixes) signal the operation type:

F (finishing) — light depth of cut, best surface finish, lowest cutting forces
M (medium) — general-purpose, balances tool life and removal rate
R (roughing) — heavy depth of cut, maximum metal removal, tougher edge

Top Brands by Application

Application	Best Brand + Grade
Steel turning (1045, 4140)	Sandvik GC4325
Stainless 304/316	Iscar IC907 or Sandvik GC2220
Cast iron milling	Sandvik GC3220 or Walter WKK10
Aluminum HSM	Iscar IC20 (uncoated) or Sandvik H10
Inconel/superalloy	Kennametal KCS10B or Sandvik S05F
Hardened steel finish	Sandvik CB7015 (CBN)

Browse our complete carbide insert catalog below. For application-specific selection help, contact us via WhatsApp +1 336-979-8015.