A taper pin is a fastener used in mechanical engineering. They are steel rods with one end having a slightly larger diameter than the other.
Metric taper pins have a taper of 1:50.[Newnes Mechanical Engineer's Pocket Book] A 1:50 taper means that one end of a 50 mm long bar will be 1 mm smaller in diameter than the other end. Inch-sized taper pins have a slightly smaller taper taper on diameter of 1:48[Machinery's Handbook] A 1:48 taper means that one end of a 4-foot-long bar (48 inches) will be 1 inch smaller in diameter than the other end, or a -inch taper over a 1-foot length.
Threaded pins
Some taper pins have a male
screw thread on the small end that is designed to project through the hole and retain the pin with a washer and a nut. Other pins are threaded on both ends, on the thick end to pull the pin out with the same nut that holds the pin in place.
Taper pin reamers
Taper pin
are designed to prepare the hole for taper pins. Metric taper reamers are designated by the small diameter. For example, a 2 mm taper pin reamer has a 1.9 mm small end (2 mm nominal size) and a 2.86 mm large end.
[ Newman Tools Inc., metric taper pin reamers]
Clock pins
A form of taper pin that precedes these standards is the
clock pin, used to accurately and repeatably register parts of a clock to one another. Clock pins do not have a standardised taper, but they generally have a more pronounced taper than the standard engineering pins. The size or gauge is defined by diameter at each end, and the length. The holes are not reamed, but are prepared using a clockmakers' cutting broach to taper a drilled hole.
