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Amana countersink drill bit 55640 drills and countersinks in one step, so a single pass creates the pilot hole and recess, which speeds up repetitive boring work on cabinet and woodworking jobs. The countersink uses a 45 degree angle, forming a consistent chamfer around the hole that seats fasteners the same way every time for a uniform finished surface. The 1/2 inch diameter cutting profile defines the size of the countersink, so the recess is wide enough for many common fastener heads where this geometry is required. A 4 mm drill section sets the pilot hole size, controlling how the fastener bites into the material for predictable holding power. The overall length of 60 mm keeps the tool compact at the spindle, which helps when working on boring machines with limited clearance. A 10 mm shank matches common boring machine collets, giving a solid grip for accurate, repeatable drilling.
This Amana Tool countersink uses a 10 mm shank, so it is designed to seat directly into boring machine chucks or collets sized for 10 mm tools, which promotes stable running during drilling and countersinking. The 60 mm overall length positions the cutting edges close to the spindle face, which supports better rigidity and helps reduce deflection when boring into hardwoods, softwoods, or panel products where straight pilot holes are important. The integrated 4 mm drill section at the center defines the depth path as the tool feeds, guiding the 1/2 inch diameter countersink cutting edges to follow accurately around the pilot. By combining the drill and countersink, the tool reduces the need to adjust separate boring and countersinking tools, which can simplify machine setup when running fixed patterns.
The SAP description as a countersink boring machine 4 mm OD identifies this tool as a dedicated boring machine countersink, so it suits shop setups built around line boring or similar machines. The 4 mm drill size is well suited to applications that call for a relatively small pilot hole, allowing fasteners matched to that diameter to draw components together tightly. With its 1/2 inch diameter countersink, the bit creates a noticeable recess, which fits work where a wider seating area around the fastener head is preferred, such as structural joints or components that see regular handling. The 45 degree chamfer angle forms a specific seating geometry, supporting projects where that angle is part of the design or hardware specification. Because the bit drills and countersinks in one pass, it aligns well with production workflows focused on running consistent hole patterns across cabinet parts or fixture components.
The 45 degree countersink angle on this Amana Tool bit sets the slope of the chamfer, which governs how the fastener head contacts the material and can affect how load is spread around the hole. By maintaining that fixed angle, the bit helps each recess match, which is valuable when many fasteners are exposed on a visible surface. The 4 mm drill size establishes a clear pilot dimension, which directly influences how the screw or fastener cuts threads in the substrate and how tightly it draws pieces together. The 1/2 inch diameter of the countersink defines the outer boundary of the recess, so the visual footprint of every fastener location remains uniform part to part. The 10 mm shank and 60 mm overall length work together to give a compact, rigid tool body, which helps hold alignment on multi-spindle boring machines where accurate spacing and straight pilot holes are critical to assembly fit.
The Amana countersink drill bit 55640 drills and countersinks in one step, so a single feed operation creates both the 4 mm pilot hole and the 1/2 inch countersink recess on a boring machine.
The 4 mm boring section sets the pilot hole diameter, which governs how a 4 mm class fastener bites into the material and helps produce consistent pull-together across multiple joints.
The 10 mm shank matches common boring machine collets, providing a solid grip that supports accurate alignment and reduces runout during drilling and countersinking operations.
The 1/2 inch countersink diameter sets the size of the recess, creating a wider seating area around the fastener head for a uniform appearance wherever this diameter is specified.
The 45 degree angle forms a specific chamfer profile, shaping how the fastener head sits in the recess and creating a consistent visual and functional result across all holes.
The 60 mm overall length keeps the bit compact in the spindle, increasing rigidity and helping maintain straight, accurately located holes during repetitive boring operations.
The Amana countersink drill bit 1/2 x 60mm uses a 4 mm boring section, 1/2 inch countersink diameter, 45 degree angle, 10 mm shank, and 60 mm length to support efficient combined drilling and countersinking on boring machines. These dimensions define how the pilot hole, recess size, and chamfer geometry will perform across cabinet and woodworking components. For work that calls for this 4 mm pilot and 1/2 inch countersink combination on a 10 mm shank boring tool, this Amana Tool 55640 design provides a clearly defined set of cutting and mounting parameters to plan around.