Hole which allows a fastener to be inserted flush with the surface
"⌴" redirects here. Not to be confused with ⍽ or ␣.
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A counterbore in a metal plate
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.
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 used instead.
The symbol is Unicode character U+2334⌴COUNTERBORE.
In machining, a counterbore (symbol: ⌴) is a cylindrical flat-bottomed hole that enlarges another coaxial hole, or the tool used to create that feature...
where the bolt's head will sit, which is often done by cutting a shallow counterbore, just deep enough "to clean up"—that is, only enough material is removed...
with or below the surface of the surrounding material (by comparison, a counterbore makes a flat-bottomed hole that might be used with a socket-head capscrew)...
glued although it is not necessary. In solid timber work it is common to counterbore a hole in the frame or carcase member to conceal the head of the screw...
plastic that, on the crankarm, is snapped or screwed into the threaded counterbore, which houses the bolt that holds the crankarm to its axle, the bottom...
thickness of its walls in the exit region. It was found that inserting a counterbore here reduced wetting. Today, the nozzles are designed to have a minimum...
a blind rivet nut, or rivnut, is a one-piece internally threaded and counterbored tubular rivet that can be anchored entirely from one side. It is a kind...
the bolted joint firmly together. The lock ring, once assembled into a counterbore in the nut body, provides clamping force on the bolt while the nut body...
following are some related processes that often accompany drilling: Counterboring This process creates a stepped hole in which a larger diameter follows...
typically flanged, and may fit into standard Allen hex socket cap screw counterbores molded or machined into parts to be fastened. Compared to Allen hex sockets...
features, such as two holes. C/T Correlation / Tracking C'BORE or CBORE or counterbore CSK or CSINK or countersink CTN, ctn carton depth, deep, down Defines...
the bolt or the nut sits inside a counterbore that is also threaded to accept a crank puller tool. The counterbore is often covered with a dust cover...
operations, like truing, making fillets, chamfers, countersinking, counterboring, etc. It may also receive various surface treatments and finishes. The...
ground diameter and the original diameter is either straight, to form a counterbore, or angled, to form a countersink. The advantage to this style is that...
following commission, including excessively high noise levels and cylinder counterbore cracking in the high-speed engines. On April 15, 2002 Skeena Queen was...
drill bit for making holes in wood, plastic, metals, concrete and more Counterbore Drill Bits – a drill bit used to enlarge existing holes Countersink Drill...
resembling a Reuleax Triangle with filleted corners, while the hollow central counterbore is cylindrical. PSC also features a shallow 2.88° taper of the triangular...
endmills, and form cutters; various drills, reamers, taps, countersinks, counterbores, and core drills; various turning tools, form tools, and threading tools;...
Non-edged, Non-powered 5130: Hand Tools, Power Driven 5133: Drill Bits, Counterbores, and Countersinks: Hand and Machine 5136: Taps, Dies, and Collets; Hand...
enclose the cartridge's case head while the bolt head was enclosed in a counterbored barrel breach, which in turn would prevent the case head from rupturing...
bits. Other tools that are commonly used in a drill bushing include counterbores, countersinks, and reamers. They are designed to guide, position, and...
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