FANAR POGLEBIACZ DIN 335-C 90° × 16.5 mm HSS countersink

FANAR POGLEBIACZ DIN 335-C 90° × 16.5 mm HSS countersink is a high-speed steel tool designed to create conical recesses for screw heads and to chamfer hole edges. Conforming to DIN 335-C dimensions, this 90° countersink with a 16.5 mm diameter is intended for metalworking and general machining tasks where a precise, standardized countersink geometry is required. The tool supports finishing operations on steel and similar materials, combining cutting edge hardness with dimensional stability for repetitive use.

Advantages

The HSS material provides a balance of toughness and wear resistance suitable for cutting and chamfering in a range of ferrous and non-ferrous metals. The DIN 335-C geometry ensures consistent 90° recesses that match standardized fastener heads, reducing assembly variance. A 16.5 mm diameter gives a practical working size for common screw and bolt preparations, while the precision-ground cutting surfaces promote cleaner edges and reduced burring during finishing.

Suitable for

• Creating 90° conical recesses for countersunk screws and bolts
• Chamfering hole entries and edges to remove burrs
• Pre-finishing holes prior to assembly in metal fabrication
• General-purpose machining tasks on steel and similar materials

Key specifications

• Tip angle: 90° conforming to DIN 335-C
• Working diameter: 16.5 mm
• Material: high-speed steel (HSS)
• Intended use: countersinking and chamfering in metal
• Geometry: precision-ground cutting surfaces for consistent results

How to use

Select an appropriate spindle speed and feed for the workpiece material, typically moderate speeds for steel to balance tool life and surface finish. Secure the workpiece and align the countersink with the hole axis; apply steady axial pressure while maintaining concentric rotation. Make light finishing passes to achieve the required recess depth and edge relief, withdrawing the tool periodically to clear chips. Use appropriate coolant or cutting fluid when working with steel to reduce heat and increase tool life.

Usage recommendations

For best results, verify fastener head dimensions against the produced recess and perform trial cuts on scrap material when changing workpiece grade. Replace the tool if signs of excessive wear or chipping appear to maintain consistent 90° recess geometry and surface quality.