Drill rod is tool steel round stock with a tight tolerance diameter; it is usually ±0.0005 in (±0.013 mm). Diameters range from 0.0135 to 1.5 in (0.34 to 38 mm); in the United States diameters smaller than 27⁄64th of an inch are made in letter drill sizes and number drill sizes, in addition to fractional sizes. Lengths are usually one or three feet (0.3 or 0.9 m). It is commonly used to make drill bits, taps, reamers, punches, dowel pins, and shafts. Note that the numbered sizes are different from the drill numbered sizes starting at 52. These sizes are:
|
|
Drill blanks have an undersize tolerance of +0/-0.0002 in, while reamer blanks have an oversize tolerance of -0/+0.0002 in.
Some mills also sell square stock that is held to the same tolerances under the name "drill rod".
Commonly available material grades in the U.S. are A2, D2, M2, M42, O1, S7, W1, and high speed steel (including M2/M7).
Read more about this topic: Bar Stock
Famous quotes containing the words drill and/or rod:
“Swift blazing flag of the regiment,
Eagle with crest of red and gold,
These men were born to drill and die.
Point for them the virtue of slaughter,
Make plain to them the excellence of killing
And a field where a thousand corpses lie.”
—Stephen Crane (1871–1900)
“The rod and reproof give wisdom: but a child left to himself bringeth his mother to shame.”
—Bible: Hebrew Proverbs 29:15.