Sutton 90° Countersink Set 4 piece Three Flute DIN - Cobalt Steel

Sutton Tools is an Australian-owned manufacturer of precision cutting tools and threading accessories, supplying tradespeople, engineers, and manufacturing operations across Australia and internationally. Their product range spans taps, dies, drills, endmills, holesaws, and related tooling — all engineered to perform consistently under real industrial conditions. AIMS Industrial supplies the Sutton Tools range to Australian businesses as part of our commitment to stocking quality, trusted brands.

Sutton cobalt three-flute countersinks in DIN standard geometry provide the heat resistance and edge retention needed for countersinking stainless steel, high-strength alloys, and hard composites in demanding production and engineering applications.

Where this product is used

Used for countersinking in stainless steel, titanium, alloy steel, and hard composite materials where HSS countersinks wear prematurely.

• Countersinking stainless steel 316 and 304 for flathead fasteners in food processing, marine, and chemical plant fabrication.
• Producing countersunk holes in high-strength structural steels and titanium alloys in defence, aerospace, and precision engineering.
• High-volume countersinking on CNC machining centres where tool change frequency with standard HSS is reducing productivity.

Key specifications

Selecting the right option

Cobalt countersinks run at lower speeds than HSS — reduce speed by 20–30% and use cutting fluid on stainless steel. Three-flute DIN geometry provides better self-centring than single-flute; use single-flute for aluminium where chatter is a concern. TiAlN coating extends life further in production environments.