Threaded Shank Drill Bit


$6.63 - $8.21
Select Flute Length

Product Specs

Surface Finish: Black Oxide
Bit Material: Cobalt Steel
Point Angle: 135 °
Point Type: Split
Drill Diameter Measurement System: Wire Gauge
Drill Diameter: No. 10
Decimal Equivalent: 0.1935 in
Flute Length: 5⁄16 in; 9⁄16 in; 1 1⁄8 in
Maximum Drilling Depth: 1 1⁄8 in; 5⁄16 in; 9⁄16 in
For Use On (Best): Stainless Steel; Heat-Resistant Alloys
Aircraft Drill: Yes
Cutting Direction: Right Hand
Depth x Diameter Ratio: 6xD; 2xD; 3xD
Double Margin: No
Drill Bit Style: Spiral
Drill Diameter Tolerance: 0.0000 in to -0.0005 in
Drill Length Type: Special Length
Drilling Application: Aviation
Flute Type: Spiral
For Use On (Good): Alloyed Titanium; Steel
For Use On ISO Code (Best): 48; 1.1; 1.2; 2.1; 4.1; 6.1; 7.1; 8.1; 9.1; 10.1; 41; 42; 43; 44; 45; 46; 47
For Use On ISO Code (Good): 51.1; 34CrMo4E
Helix Angle: 30 °
Material Grade: M35
Number of Flutes: 2
Overall Length: 2 1⁄8 in; 9⁄16 in; 1 1⁄4 in
Powdered Metal Material: No
Quantity: Individual
Series: 218-3710; 218-3110; 218-3410
Shank Thread Size: 1/4"-28
Shank Type: Threaded
Specifications Met: NAS965
Spiral Direction: Right Hand
Through Coolant: No
Web Construction: Parallel
Web Thinning: X-Thinned

About Threaded-Shank Drill Bits

Often used in the aircraft industry and woodworking applications, these threaded-shank drill bits fit into a threaded adapter in angle or offset drills to enable drilling in close quarters where standard chuck-type drills can't reach. The bits have a self-centering 135° split point, also known as a crankshaft, that helps prevent the bit from walking when starting to drill a hole.

Suitable for drilling into hard materials such as hard steels, stainless steel, titanium alloys, and nickel alloys, these cobalt steel drill bits are harder than high speed steel bits and are more wear resistant at higher speeds.