Sgs 40121 Square End Mill 3mm 4 Flute Solid Carbide

Product Description

The SGS 40121 is a 4-flute solid carbide square end mill designed for precision milling in a wide range of metalworking applications. With a 3 mm cutting diameter and a 12 mm length of cut, this tool delivers clean, accurate results in ferrous and non-ferrous materials. The micrograin carbide construction provides rigidity and wear resistance at small diameters. A 30-degree helix angle promotes efficient chip evacuation, while the variable index design reduces harmonic vibration during aggressive cuts. The bright, uncoated finish suits applications where coating interaction with the workpiece material is a concern. This is a single-end, right-hand cut tool with a straight cylindrical shank.

The SGS 40121 is suited for light-to-medium milling operations in materials classified under workpiece material codes H, K, M, N, P, and S — covering cast iron, non-ferrous metals, stainless steel, steel alloys, and superalloys. Its compact 3 mm diameter makes it a fit for fine-detail slotting, profiling, and pocketing work on CNC machining centers and manual mills where tight tolerances and small feature geometry are required. The regular-length configuration keeps deflection minimal in close-tolerance work.

Key Features

• 3 mm cutting diameter with a mill diameter tolerance of +0.000 / -0.050 mm for precise fitment
• 4 flutes with variable index geometry to reduce chatter and improve surface finish
• Micrograin solid carbide construction for hardness and edge retention at small diameters
• 30-degree right-hand spiral flutes promote efficient chip flow and reduce heat buildup
• Center-cutting capable — supports plunge entry cuts
• Bright, uncoated finish suitable for a broad range of workpiece materials

Compatibility

Compatible with workpiece materials designated under codes H, K, M, N, P, and S, including cast iron, non-ferrous metals, stainless steel, general steel alloys, and superalloys. Belongs to SGS Series 1M.

Installation Notes

Installation is performed by qualified machinists or CNC tooling technicians. Ensure the machine spindle and tool holder are clean and free of debris before seating the straight cylindrical shank. Verify runout at the tool tip after installation — excessive runout at this diameter accelerates edge wear. Always confirm spindle speed, feed rate, and depth of cut are appropriate for the workpiece material before initiating a cut.