This general purpose screw machine drill bit is made of high speed steel and has a 21/64 inch diameter, 1 5/16 inch long shank. It is for use with aluminum, brass, bronze, cast iron, copper, and steel. This 157 series screw machine length drill bit has a bright (uncoated) finish, and has letter measurements. It has a three-inch length. Plus it has two 1 11/16 inch spiral flutes, a straight shank, and 118 Degrees conventional point.
Technical Specs
ItemScrew-Machine Length Drill Bit
Decimal Equivalent0.339
Material - MachiningHigh Speed Steel
Drill Bit Point Angle118 Degrees
Flute TypeSpiral
Flute Length1 11/16 in
Helix Angle28 Degrees
Spiral DirectionRight Hand
Shank Dia.21/64 in
Overall Length3 in
Drill Length ClassScrew Machine Length
Drill Bit GroupingIndividual
StandardsNot Rated
Material Grade - MachiningGeneral Purpose
Primary Material Application ISO CodeK, N, P
Drill Bit SizeR
Measurement SystemLetter
Finish - MachiningBright (Uncoated)
Drill Bit Point TypeConventional Point
Number of Flutes2
Maximum Drilling Depth1 11/16 in
Cutting DirectionRight Hand
Shank Type - MachiningStraight
Shank Length1 5/16 in
Depth:Dia. Ratio4xD
Drill Point Length0.0000 in
Series157
Drill Diameter Tolerance+0.0000 in/-0.0010 in
Primary Material ApplicationAluminum, Brass, Bronze, Cast Iron, Copper, Steel