This high-performance jobber length drill bit is made of high speed steel and has a 7/16 inch diameter, 1 15/16 inch long shank. It is for use with aluminum, brass, bronze, copper, steel, and meets the standards for NAS 907 Type B. This 3957-6 series jobber drill bit has a bright (uncoated) finish, and has fractional inch measurements. It is non-coolant through with a six-inch length. Plus it has two 4 1/16 inch spiral flutes, a straight shank, and a 135 Degrees split point.
Technical Specs
ItemJobber Length Drill Bit
Decimal Equivalent0.4375
Material - MachiningHigh Speed Steel
Drill Bit Point Angle135 Degrees
Coolant FedNon-Coolant Through
Number of Flutes2
Maximum Drilling Depth1 3/4 in
Cutting DirectionRight Hand
Shank Type - MachiningStraight
Shank Length1 15/16 in
Depth:Dia. Ratio4xD
Drill Point Length0.0906 in
Series3957-6
Aircraft DrillYes
Material Grade - MachiningHigh Performance
Primary Material Application ISO CodeN, P
Drill Bit Size7/16 in
Measurement SystemFractional Inch
Finish - MachiningBright (Uncoated)
Drill Bit Point TypeSplit Point
Flute TypeSpiral
Flute Length4 1/16 in
Helix Angle21 Degrees /34 Degrees
Spiral DirectionRight Hand
Shank Dia.7/16 in
Overall Length6 in
Drill Length ClassJobber Length
Drill Bit GroupingIndividual
StandardsNAS 907 Type B
Drill Diameter Tolerance+0.0000 in/-0.0010 in
Primary Material ApplicationAluminum, Brass, Bronze, Copper, Steel