Countersinks

Countersinks are tools used for cutting angled holes or countersinks in a workpiece. They have fluted designs and are used to make clean cuts in hardwood, metal, plywood, and plastic.  Countersinks are fashioned to a wide range of engagement angles (60°, 82°, 90°, 100°, 110°, 120°, 130°, 140°, etc.), and to either metric or English standards.  

Countersinks are available in a wide range of materials, from general application uses to products used to cut into very hard surfaces.  The most commonly used materials are high speed steel, cobalt steel, carbide and carbide tips, and diamond tips. High-speed steel is a cost-efficient cutter material.  It is used for general application metal machining. Cobalt steel tools are somewhat harder than high-speed steel and are often used for cutting stainless steel and other alloys. Carbide grades are much harder than high-speed steel, and therefore last longer and wear less.  Several coatings are available to lengthen cutter life.  This classification includes solid carbide and carbide-tipped countersinks. Industrial diamond grades such as polycrystalline diamond (PCD) have very long service lives and are often used for special applications such as very high-speed cutting.

In addition to their material composition, many countersinks offer specific features to better fill the needs of given applications.  Some of these features include coated tips, integral stops, reverse countersinks, and integral pilots.  Coated tips assist in cutting lubricity and/or add abrasion resistance for longer tool life.  Integral stops are used for depth control, to prevent the countersink from penetrating beyond a specified depth.  Reverse countersinks do not have a point.  This is useful in situations where a point could pierce too deeply into a given material and compromise its structural integrity.  Integral pilots are guides, which can be used to allow countersinks to locate predrilled holes, without marring the surface of the component material.

• Countersinking Handbook
  Countersinking Handbook Containing case histories, practical tips and information to make process selection easier, this book provides total coverage of issues related to countersinking and...
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Part Numbers for Countersinks