Bordo 10mm 90 Degree HSS Co5 Triple Flute Countersink Bit

Bordo countersinks produce angled recesses for flush-seated fasteners and deburr drilled holes in one pass. The 90 Degree HSS Co5 Triple Flute Countersink Bit is part of Bordo's comprehensive Australian cutting tool range — trusted by engineers, tradespeople, and machinists across industry and manufacturing.

Where this product is used

Cross-hole countersinks run true and resist chatter — the cross-hole geometry interrupts the cut and reduces the tendency of single-flute countersinks to chatter.

• Countersinking drilled holes for flush fastener seating in steel, aluminium, and wood
• Engineering production and workshop countersinking of fixed and clearance holes
• Sheet metal, fabrication, and carpentry where flush screw heads are required

Key specifications

Selecting the right option

Angle must match the fastener — 90° is standard for most countersunk machine screws; 82° suits some older imperial standards. Cross-hole countersinks cut on multiple contact points simultaneously, reducing chatter. Adjustable depth-stop attachments control countersink depth in production.