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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 ...
Whereas a counterbore is a flat-bottomed enlargement of a smaller coaxial hole, a countersink is a conical enlargement of such. A spotface often takes the form of a very shallow counterbore. As mentioned above, the cutters that produce counterbores are often also called counterbores; sometimes, to avoid ambiguity, the term counterbore cutter is ...
A drill bushing, also known as a jig bushing, [1] is a tool used in metalworking jigs to guide cutting tools, most commonly drill bits. Other tools that are commonly used in a drill bushing include counterbores, countersinks, and reamers. They are designed to guide, position, and support the cutting tool. [2]
While the above is a common use of center drill bits, it is a technically incorrect practice and should not be considered for production use. The correct tool to start a traditionally drilled hole (a hole drilled by a high-speed steel (HSS) twist drill bit) is a spotting drill bit (or a spot drill bit, as they are referenced in the U.S.). The ...
ISO 4203:1978 Parallel shank tools — Driving tenons and sockets — Dimensions [Withdrawn without replacement] ISO 4204:2016 Countersinks, 90°, with Morse taper shanks and detachable pilots; ISO 4205:2016 Countersinks, 90°, with parallel shanks and solid pilots; ISO 4206:2016 Counterbores with parallel shanks and solid pilots
DIN replacement Other org replacement DIN 201: Technical drawings; Hatchings; Representation of cutting edges and materials: Withdrawn: DIN ISO 128-50: ISO 128-50: DIN 209: Machine Reamers with Screwed-on Blades: Active: DIN 267-1: Fasteners – Part 1: Technical delivery conditions; General requirements: Withdrawn: ISO 8992 DIN 267-2