This innovative, helical HSS and HSCO countersink drastically reduces axial and radial forces that occur during countersinking, due to the unique geometry of the cutting edge design. SpyroTec’s convex form and variable pitch cutting edges provide a stable countersinking process and minimal vibration – even when using a hand drill. Available from stock in 90 degree, 82 degree and 60 degree countersinks – also in convenient sets!
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Related Glossary Terms
Tool that cuts a sloped depression at the top of a hole to permit a screw head or other object to rest flush with the surface of the workpiece.
Cutting a beveled edge at the entrance of a hole so a screw head sits flush with the workpiece surface.
- high-speed steels ( HSS)
high-speed steels ( HSS)
Available in two major types: tungsten high-speed steels (designated by letter T having tungsten as the principal alloying element) and molybdenum high-speed steels (designated by letter M having molybdenum as the principal alloying element). The type T high-speed steels containing cobalt have higher wear resistance and greater red (hot) hardness, withstanding cutting temperature up to 1,100º F (590º C). The type T steels are used to fabricate metalcutting tools (milling cutters, drills, reamers and taps), woodworking tools, various types of punches and dies, ball and roller bearings. The type M steels are used for cutting tools and various types of dies.
1. On a saw blade, the number of teeth per inch. 2. In threading, the number of threads per inch.