RUKO HGB-DIN2181-HSS-60°-1/4x Centre Drill Bit, 1.0 mm Pilot, 3.15 mm Countersink, HSS, DIN 333 Form A

Precision-ground from solid HSS, this centre drill bit delivers a 60° countersink angle with a 1.0 mm pilot diameter, ideal for accurate centre holes in steel, cast iron, and non-ferrous metals.

Overview

The RUKO HGB-DIN2181-HSS-60°-1/4x is a centre drill bit conforming to DIN 333 Form A, without protective chamfer. It features a 1.0 mm pilot drill diameter, 3.15 mm countersink diameter, and 4.0 mm shank diameter. The overall length is 31.5 mm, and the cutting direction is right-hand. The surface is bright (uncoated), and the shank tolerance is h8.

What stands out

• High-speed steel (HSS) construction for durability and heat resistance.
• Ground from solid for precise geometry and smooth cutting.
• 60° countersink angle suitable for standard centre holes.
• Form A without protective chamfer, per DIN 333.
• Bright finish for clean, accurate work.

Technical details

• Drill Type: Centre Drill
• Standard: DIN 333
• Form/Type: A (without protective chamfer)
• Material: High-Speed Steel (HSS)
• Pilot Drill Diameter (d1): 1.0 mm
• Countersink Diameter (d2): 3.15 mm
• Shank Diameter (d3): 4.0 mm
• Overall Length (l1): 31.5 mm
• Countersink Angle: 60°
• Cutting Direction: Right-hand
• Surface Treatment: Bright (uncoated)
• Shank Tolerance: h8
• Manufacturing Method: Ground from solid
• Recommended Material: Steel, Cast Iron, Non-ferrous Metals
• Application: Creating precise centre holes for subsequent machining operations

Our verdict

A dependable centre drill for machinists who need accurate starting points for drilling or turning. The HSS material and ground finish ensure consistent performance.