CMT 521.002.21 Solid Carbide Countersink - 90 deg. Angle by CMT is a professional-grade countersinking tool designed to produce clean, accurate countersunk holes for flat-head fasteners in hardwood, softwood, chipboard, MDF, and non-ferrous metals. With a 19.5mm cutting diameter, a 10x48mm parallel shank, and 3 precision-ground solid carbide cutting edges, this countersink delivers smooth, burr-free results in demanding applications including CNC routing, router table work, and drill press operations. The 90 deg. included angle matches the geometry of standard flat-head screws and bolts, making it a reliable choice for cabinetmakers, woodworkers, and fabricators who need consistent, repeatable countersink profiles.

Key Features

• Solid carbide (HWM) construction - harder and more wear-resistant than high-speed steel, allowing higher cutting speeds and significantly longer tool life in hardened and abrasive materials.
• 3 precision-ground cutting edges - the three-flute geometry distributes cutting load evenly, reducing vibration and producing a smooth, clean countersink finish that requires little or no sanding.
• 90 deg. countersink angle - matches the head geometry of standard flat-head fasteners, ensuring flush or below-surface seating without additional fitting or adjustment.
• 19.5mm (49/64") cutting diameter - accommodates a wide range of flat-head screw sizes in a single pass, reducing tool changes on the job.
• 10x48mm parallel shank - provides a secure, concentric grip in standard chucks and collets for CNC machines, drill presses, and router tables, minimizing runout.
• 9mm cutting height - sufficient depth for most flat-head fastener countersinking applications in panel goods, solid wood, and non-ferrous stock.
• 70mm overall length - gives adequate clearance for use in a variety of machine setups without excessive tool overhang or chatter risk.
• Right-hand (RH) rotation - compatible with all standard CNC routers, drill presses, and handheld drills running in conventional forward direction.

Why This Product

• The solid carbide construction makes this countersink a strong fit for high-volume production environments where tool replacement downtime is costly - carbide holds its edge far longer than high-speed steel alternatives when cutting hardwood, chipboard, or MDF repeatedly.
• Three cutting edges instead of a single-flute design means each pass produces a cleaner, more uniform countersink seat, which matters when working with visible joinery or furniture-grade panels where surface quality is critical.
• The 90 deg. angle is the standard geometry for the vast majority of flat-head screws and bolts used in woodworking and light fabrication, so this tool covers a broad range of assembly tasks without requiring multiple countersink angles in the shop.
• With a 10x48mm parallel shank and 70mm total length, this countersink fits directly into standard CNC spindle collets and drill press chucks, making it a practical drop-in choice for shops already equipped with common toolholding systems.

Specifications

• Manufacturer Part Number: 521.002.21
• Brand: CMT Orange Tools
• Angle: 90 deg.
• Diameter: 19.5mm (49/64")
• Cutting Height: 9mm
• Total Length: 70mm (2-3/4")
• Shank: 10x48mm (25/64")
• Number of Teeth: 3
• Material: HWM (Solid Carbide)
• Rotation: RH (Right Hand)

Approved Applications

• Solid Hardwood
• Softwood
• Chipboard
• MDF
• Non-Ferrous Metals
• CNC Routing Machine
• Router Table
• Drill Press