WCMT 040208FN OS5835 Carbide Drill Insert

The WCMT 040208FN OS5835 is a high-quality carbide drill insert designed for use in indexable drilling systems. With its W-shaped trigon geometry and positive cutting edges, it provides smooth cutting action, low cutting forces, and efficient chip evacuation. The 0.8 mm corner radius increases edge strength, enabling stable performance under higher feed rates and extending tool life in demanding drilling operations.

Manufactured in OS5835 grade, this insert features a fine-grained carbide substrate with a copper-colored PVD coating. The grade provides excellent wear resistance and versatility, making it suitable for steels, stainless steels, and cast irons. The FN chipbreaker is specifically optimized for drilling, ensuring controlled chip flow, consistent hole accuracy, and improved surface quality even during long production runs.

The WCMT 040208FN OS5835 is compatible with a wide range of indexable drill bodies designed for WCMT inserts. It is widely used in automotive, mold-making, and precision engineering industries where productivity, repeatability, and hole accuracy are essential.

Code Breakdown:

• W – Insert shape: trigon (80° with curved edges)

• C – Relief angle: 7° positive

• M – Tolerance class (medium)

• T – Insert with hole and chipbreaker

• 04 – Insert size: 4 mm

• 02 – Insert thickness: 2.38 mm

• 08 – Corner radius: 0.8 mm

• FN – Chipbreaker for drilling

• OS5835 – Grade for steels, stainless steels, and cast iron

Key Features:

• WCMT-style trigon carbide drill insert

• Size: 4 mm, thickness 2.38 mm, radius 0.8 mm

• OS5835 grade – versatile copper PVD coating

• FN chipbreaker for stable chip control in drilling

• Positive geometry for low cutting forces and smooth finish

• Fits indexable drill bodies for WCMT inserts

• Best for steels, stainless steels, and cast irons

Grade Information (OS5835):

• Coating: PVD, copper color

• Application: drilling and milling of steels (45#, Q235), stainless steels (304, 316), cast iron

• Best for: stainless steel and general-purpose drilling

• Material hardness: HRC <30

• Cutting speed: 120–220 m/min