The Bormax® Prima Long Forstner bit is engineered for deep, precision counterbores in both handheld and stationary drills. Its extended flute design evacuates chips efficiently, while the sturdy 10 mm hex shank delivers stable, wobble-free performance—even at steep angles or in end grain.

✨ Key Features

• Exchangeable Pilot & Centre Drill – Includes HSS pre-drill and centre bits for flawless starts, even when inclined.

• 10 mm Hex Shank – Ensures slip-free grip and maximum power transfer in chucks or hex adapters.

• Grooved Offset Blades – Two main cutting edges plus toothed, grooved rim reduce feed force, friction and heat.

• Deep-Hole Geometry – Extended flute length supports clean chip removal up to 120 mm depth.

• Low Heat Build-Up – Minimises wear for longer service life under heavy loads.

• Consistent Hole Quality – Produces smooth, tear-free edges in softwoods, hardwoods, MDF and chipboard.

⚙️ Technical Specifications

(Example for Ø 50 mm bit)

• Drill Ø: 50 mm

• Max Depth: 120 mm

• Flute Length: 90 mm

• Overall Length: 150 mm

• Shank: 10 mm hexagon, alloyed tool steel

📐 Available Diameters

• 20–40 mm (with Ø 8 mm pre-drill)

• 44–120 mm (with Ø 10 mm pre-drill)

🪵 Typical Applications

• Precision counterbores for dowels, hinges and fittings

• Deep through-holes and pocket drilling

• Angled boring in stair treads and end-grain components

• Clean edge-to-edge holes in plywood, laminated panels and solid wood

📦 Package Contents

• 1 × Bormax® Prima Long Forstner bit (blister pack)

• 1 × HSS pre-drill bit (Ø 8 mm or Ø 10 mm)

• 1 × HSS centre drill bit (matching pilot)

• 1 × Allen key

🔧 Replacement Accessories 

• Centre Drills: F1619208 (Ø 8 mm), F1619210 (Ø 10 mm)

• Pre-Drill Bits: F1614208 (for 20–40 mm), F1614210 (for 44–120 mm)

💡 Why Choose Bormax® Prima Long?

Upgrade your toolkit with the Prima Long’s extended reach and optimised flute geometry. Enjoy faster cuts, cooler operation and remarkably clean, deep counterbores on every job—perfect for professional joinery, cabinetry, stair construction and demanding wood-boring tasks.