Sumitomo-Original Inserts from Japan

All 15 inserts in this catalog are 100% genuine Sumitomo — manufactured by Sumitomo Electric Industries in Itami, Japan. Each insert is sourced through Sumitomo's authorized distribution channels and ships in original Sumitomo factory packaging with full Sumitomo grade and lot traceability. Sumitomo's premium carbide substrates, CVD/PVD coatings, and edge-preparation processes are specified across the full AC / NC / GC / KW / A-series grade families — providing the consistent performance and reliability that has made Sumitomo a leading Japanese cutting-tool brand.

About SN 90° Square Negative Inserts

Sumitomo 90° square negative inserts with hole provide 8 cutting edges per insert for heavy-duty steel and stainless roughing. The 90° point creates square shoulders with maximum economy on heavy-section work.

The SN-90-SQUARE family includes sub-designations:

• SNMG — 90° Square Negative w/ Hole + Molded Chipbreaker

Sumitomo Electric Industries (Itami, Japan) is one of the world's leading manufacturers of CNC cutting tools, with over 100 years of carbide expertise. The Sumitomo AC series (CVD/PVD-coated steel), NC series (cermet + stainless), GC series (aluminum + cast iron), and A-series (ceramic) represent decades of grade development.

How to Choose the Right Sumitomo SN-90-SQUARE Insert

Selecting the correct Sumitomo SN-90-SQUARE insert involves three decisions:

1. Material → Grade: Steel → AC6020M / AC6030M. Stainless → NC5330 / NC5340. Cast iron → NC40 series. Aluminum → GC3040 / KW10.
2. Sub-designation → Operation: General turning → SNMG. Finishing → SNMG. Heavy roughing → thicker section.
3. IC size → Tool holder: Smaller IC fits compact holders. Larger IC for heavy-duty work.

Tip: For stainless steel work, Sumitomo NC5330 / NC5340 (CVD M-grade) provide superior wear resistance. For aluminum, use uncoated GC3040 or KW10 with sharp-edge geometry.