The CMT 521.001.11 Adjustable Countersink TCT is a precision-engineered carbide-tipped countersinking tool designed to accept twist drill bits in the 3mm to 7mm range, allowing woodworkers and tradespeople to drill and countersink in a single pass. Built with 2 tungsten carbide (TCT) cutting edges and a right-hand rotation, this adjustable countersink delivers clean, professional 45 deg. entry points for flat-head screws across a countersink diameter range of 11mm to 15mm. The tool's adjustable design makes it a versatile choice for solid hardwood, softwood, MDF, chipboard, and plywood applications - whether you are working at a drill press, operating a handheld drill, or running a CNC machine.

Key Features

• Adjustable drill bit acceptance (3mm - 7mm / 1/8 in. - 9/32 in.): accommodates a wide range of standard twist drill bit sizes, so one tool handles multiple screw-prep tasks without swapping countersinks.
• Countersink diameter range of 11mm - 15mm (7/16 in. - 19/32 in.): the adjustable diameter lets you dial in the exact countersink size needed for different screw heads, reducing the need to purchase multiple fixed-size countersinks.
• 2 TCT (tungsten carbide-tipped) cutting edges: carbide construction delivers a cleaner, more precise countersink finish compared to standard high-speed steel, and holds a sharp edge longer during repeated use in hard materials.
• Right-hand (RH) rotation: compatible with all standard right-hand drill drivers and drill presses, ensuring straightforward setup without special tooling requirements.
• HW (tungsten carbide / hardmetal) material construction: the carbide-grade material handles demanding work in dense substrates like solid hardwood and chipboard, maintaining cutting performance over extended production runs.
• Locking screw for quick bit changes: the locking mechanism allows fast, secure drill bit swaps, minimizing downtime between setups and keeping workflow moving efficiently.

Why This Product

• The adjustable countersink diameter (11mm - 15mm) combined with the adjustable drill bit acceptance (3mm - 7mm) means a single tool replaces several fixed countersinks - an efficient, cost-effective solution for shops that work with varied screw sizes.
• The 2 TCT cutting edges provide the durability needed for consistent results in demanding materials like solid hardwood and MDF, where standard high-speed steel edges can dull quickly and leave rough, tear-out-prone countersink seats.
• The right-hand rotation and compatibility with drill presses, handheld drills, and CNC machines makes this countersink a flexible addition to any woodworking or joinery setup - professional or job-site use alike.
• Because the locking screw allows the twist drill bit to be swapped without replacing the countersink body, the tool adapts quickly as project requirements change, reducing both tool clutter and cost over time.

Specifications

• Manufacturer Part Number: 521.001.11
• Brand: CMT Orange Tools
• Description: Adjustable Countersink
• Diameter (Large): 11mm - 15mm (7/16 in. - 19/32 in.)
• Diameter (Small / Drill Bit Acceptance): 3mm - 7mm (1/8 in. - 9/32 in.)
• Number of Cutting Edges: 2
• Cutting Edge Material: TCT (Tungsten Carbide-Tipped) - HW
• Rotation: Right-Hand (RH)
• Countersink Angle: 45 deg.
• Overall Length: 33mm
• Maximum Shank: 8mm
• Country of Origin: Made in Italy

Approved Applications

• Countersinking for flat-head screws in solid hardwood, softwood, MDF, chipboard, and plywood
• Creating screw entry points for clean, flush-seated fastener installation
• Drill press countersinking operations
• Handheld drill countersinking and combined drilling and countersinking in a single pass
• CNC machine countersink routing applications