Halls XCM High Speed Steel Countersink 20.5mm

About this tool

The Halls XCM High Speed Steel Countersink in 20.5mm size is the largest in the range, specifically designed for substantial countersunk fasteners in heavy industrial, civil engineering, and major structural fabrication projects. This professional-grade countersink handles M16 countersunk bolts and similar large fasteners, making it indispensable for shipbuilding, bridge construction, and heavy machinery assembly. Manufactured from premium high speed steel with a precision-engineered 3-flute design, this 20.5mm countersink delivers exceptional cutting performance in thick steel plates and heavy-gauge materials. The 90° included angle ensures accurate chamfers that allow large countersunk fasteners to sit perfectly flush, essential for structural integrity and professional finish quality. Equipped with a 1/4in hexagon shank for compatibility with high-torque power tools, this countersink represents the ultimate solution for demanding metalworking applications where only the largest professional-grade tooling will suffice. Features and Benefits: • 20.5mm diameter for M16 and substantial fasteners • High speed steel for maximum durability and longevity • 3-flute design provides powerful cutting action • 90° angle for standard large countersunk profiles • 1/4in hex shank fits professional power tools • Essential for heavy industrial and structural work Specifications: Countersink Type: Countersink Size (mm): 20.5

Retailer description · Tooled Up · Observed 12 Oct 2026. Check the retailer’s listing for full specifications and contents.