- 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 cap****)...
-
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 ****...
-
plastic that, on the crankarm, is
snapped or ****ed into the
threaded counterbore,
which houses the bolt that
holds the
crankarm to its axle, the bottom...
-
typically flanged, and may fit into
standard Allen hex
socket cap ****
counterbores molded or
machined into
parts to be fastened.
Compared to
Allen hex sockets...
-
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...
- 57 1969
Change to N
serial number prefix 57-1 1982
Eliminate cylinder counterbore and
pinned barrel,
change in
cylinder length to 1.67″ 57-1 1986 Nickel...
-
Changed from gas ring on yoke to
cylinder 13-3 1982
Eliminated cylinder counterbore and
pinned barrel/small
change in
cylinder length to 1.62" 13-4 1988...
-
Soviet Union, but also its
various satellite nations. Many of
these were
counterbored post-war.
Model 1891/59 Carbine:
Commonly called "91/59s," the M1891/59s...
