This M42 jobber length drill bit is made of cobalt and has a 15/64 inch diameter, 1¼ inch long shank. It is for use with steel, titanium, tool and die steel, and meets the standards for NAS 907 Type J. This 55TN series jobber length drill bit has a TiN finish, and has fractional inch measurements. It is non-coolant through with a 3⅞ inch length. Plus it has two 2⅝ inch spiral flutes, a straight shank, and a 135 Degrees split point.
Technical Specs
ItemJobber Length Drill Bit
Decimal Equivalent0.2344
Material - MachiningCobalt
Drill Bit Point Angle135 Degrees
Coolant FedNon-Coolant Through
Flute TypeSpiral
Flute Length2 5/8 in
Helix Angle28 Degrees
Spiral DirectionRight Hand
Shank Dia.15/64 in
Overall Length3 7/8 in
Drill Length ClassJobber Length
Drill Bit GroupingIndividual
StandardsNAS 907 Type J
Drill Diameter Tolerance+0.0000 in/-0.0007 in
Web ThinningThinned
Primary Material ApplicationStainless Steel, Steel, Titanium, Tool and Die Steel
List Number2550
Drill Bit Size15/64 in
Measurement SystemFractional Inch
Finish - MachiningTiN
Drill Bit Point TypeSplit Point
Number of Coolant Holes0
Number of Flutes2
Maximum Drilling Depth15/16 in
Cutting DirectionRight Hand
Shank Type - MachiningStraight
Shank Length1 1/4 in
Depth:Dia. Ratio4xD
Drill Point Length0.0485 in
Series55TN
Aircraft DrillYes
Sheeter DrillNo
Material Grade - MachiningM42
Primary Material Application ISO CodeP, S
Country of OriginUnited States
(subject to change)