This general purpose screw machine drill bit is made of high speed steel and has a ¼ inch diameter, 1⅛ 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 fractional inch measurements. It has a 2½ inch length. Plus it has two 1⅜ inch spiral flutes, a straight shank, and 118 Degrees conventional point.
Technical Specs
ItemScrew-Machine Length Drill Bit
Decimal Equivalent0.25
Material - MachiningHigh Speed Steel
Drill Bit Point Angle118 Degrees
Flute TypeSpiral
Flute Length1 3/8 in
Helix Angle28 Degrees
Spiral DirectionRight Hand
Shank Dia.1/4 in
Overall Length2 1/2 in
Drill Length ClassScrew Machine Length
Drill Bit GroupingIndividual
StandardsNot Rated
Material Grade - MachiningGeneral Purpose
Primary Material Application ISO CodeK, N, P
Drill Bit Size1/4 in
Measurement SystemFractional Inch
Finish - MachiningBright (Uncoated)
Drill Bit Point TypeConventional Point
Number of Flutes2
Maximum Drilling Depth1 3/8 in
Cutting DirectionRight Hand
Shank Type - MachiningStraight
Shank Length1 1/8 in
Depth:Dia. Ratio4xD
Drill Point Length0.0751 in
Series157
Drill Diameter Tolerance+0.0000 in/-0.0007 in
Primary Material ApplicationAluminum, Brass, Bronze, Cast Iron, Copper, Steel