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In manufacturing, a countersink (symbol: ⌵) is a conical hole cut into a manufactured object, or the cutter used to cut such a hole. A common use is to allow the head of a countersunk bolt , screw or rivet , when placed in the hole, to sit flush with or below the surface of the surrounding material (by comparison, a counterbore makes a flat ...
In machining, a counterbore (symbol: ⌴) is a cylindrical flat-bottomed hole that enlarges another coaxial hole, or the tool used to create that feature. A counterbore hole is typically used when a fastener , such as a socket head cap screw or fillister head screw, is required to sit flush with or below the level of a workpiece 's surface.
Small (about 1 ⁄ 4 inch or 6.4 millimetres diameter) threaded drill bits and countersinks are common in aircraft metal work. Threaded drill bits may be held in drills meant to reach into very tight spaces, and threaded countersink cutters are widely used (along with finely adjustable depth stops) to create holes which put a matching rivet ...
Pages in category "Metalworking cutting tools" The following 42 pages are in this category, out of 42 total. ... Countersink; Cutting tool (machining) D. Diamond segment;
J10 Small tools. (twist drills, countersinks, counterbores, cutting-off tool cutters, cutters etc.),(at least 9 sections) J11 Ammunition renovating tools. J12 Tools, Maintenance, for repair of group B materiel; J13 Special tool sets for field artillery, and combat vehicle weapons; J14 Paint, spraying equipment, and related items.
Similar to an endmill but with flat-bottom plunging ability. The tool at E, a counterbore, is also often used for spotfacing in manual machining (not so much in CNC machining). A spotface or spot face is a machined feature in which a certain region of the workpiece (a spot) is faced, providing a smooth, flat, accurately located surface.