RUKO FLS-DIN373-M10-fein HSS Countersink Bit, 3-Flute, 10.2 mm Pilot, DIN 373

The RUKO FLS-DIN373-M10-fein countersink bit stands out with its precision-ground HSS construction and three cutting edges, delivering clean, chatter-free countersinks in a single pass. Unlike standard countersinks, this tool is engineered for cylindrical head screws per DIN 373, combining pilot and countersink in one operation for accurate alignment and reduced tool changes.

Highlights

• DIN 373 compliant countersink for cylindrical head screws (DIN 912, DIN 7984, ISO 4762)
• High-speed steel (HSS) body with bright finish for durability and corrosion resistance
• Three cutting edges ensure smooth, vibration-free countersinking
• Parallel shank with h8 tolerance for secure chuck grip
• Suitable for steel, cast iron, non-ferrous metals, and plastics

In daily use

Pre-drill and countersink in one operation, saving time and improving hole quality. The 10.2 mm pilot diameter guides the bit precisely, while the 16.0 mm countersink diameter creates a clean recess for M10 screw heads. The right-hand cutting direction and ground flutes provide efficient chip evacuation and a fine surface finish.

Full specifications

• Standard: DIN 373
• Screw size compatibility: M10
• Tool type: Countersink
• Material: HSS (High Speed Steel)
• Pilot diameter (d1): 10.2 mm
• Countersink diameter (d2): 16.0 mm
• Shank diameter (d3): 10.0 mm
• Overall length (l1): 92 mm
• Number of cutting edges: 3
• Shank type: Cylindrical (Parallel Shank)
• Surface treatment: Bright (Uncoated)
• Manufacturing process: Ground
• Rotation direction: Right-hand cutting
• Shank tolerance: h8
• Product code: 433.800

Final note

A reliable choice for workshops and production environments where precision and repeatability are essential.