SEKN / SEEN1203AFTN / SPKN Milling Inserts.

The SEKN SEEN1203AFTN SPKN Milling Inserts are durable square carbide inserts designed for face milling and roughing applications. Manufactured from high-quality carbide with advanced coatings, the SEKN SEEN1203AFTN SPKN Milling Inserts provide excellent wear resistance, edge stability, and toughness in demanding machining environments. With their strong geometry and square cutting edges, the SEKN SEEN1203AFTN SPKN Milling Inserts ensure consistent chip control, reduced cutting forces, and extended tool life when machining steels, stainless steels, and cast irons.

These inserts are widely applied in face mills and square shoulder cutters, offering versatility in roughing, semi-finishing, and heavy-duty milling. Their negative rake design allows multiple cutting edges per insert, providing cost efficiency and longer productivity. SEKN and SPKN inserts are primarily used for roughing, while SEEN inserts with positive rake are suitable for finishing and lighter cuts.

Commonly used in automotive, mold-making, and heavy engineering industries, these inserts are recognized for their reliability, strength, and consistent surface quality.

Code Breakdown

• SEKN – Square insert, negative rake, general-purpose milling

• SEEN1203AFTN – Square insert, positive rake, 12×12×3.97 mm, optimized for finishing

• SPKN – Square insert, negative rake, stronger edge for roughing

• 1203 – Insert dimensions: 12 mm IC, 3.97 mm thickness

• AFTN – Chipbreaker / geometry designation for stability and chip evacuation

Key Features of the Milling Inserts

• Square geometry with 4 effective cutting edges

• Negative rake (SEKN/SPKN) for heavy-duty milling

• Positive rake (SEEN) for finishing operations

• Advanced coating for wear and heat resistance

• Reliable in steels, stainless steels, and cast irons

Equivalent Milling Inserts (Other Brands)

• Sandvik: SEKN 1203AFTN 1030 (Sandvik official site)

• Seco: SEKN / SEEN 1203 AF F30M

• Kennametal: SPKN 1203 series

• Iscar: SEKN / SPKN 1203 IC328

Application Guidelines

• Best suited for face milling and shoulder milling

• Cutting speed (steel): 140–240 m/min

• Depth of cut: up to 4.0 mm

• Applications: roughing, semi-finishing, and finishing with the SEEN style

For SEKN, SEEN, and SPKN inserts, visit our Diamond Cut store.