M81 Cobalt Jobbers Length Twist Drill
T&O M81 Cobalt Jobbers Length Twist Drills - Cutting Direction: Right Hand   Size : S   Tool Material: M35 cobalt steel   Shank Style: Straight Shank   Drill Type: Jobbers Length

M81 Cobalt Jobbers Length Twist Drill

Item #: 01-022-219
Brand: T&O
Size: S
Size Type: Letter
Finish Coating: Bright Finish

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Suited for tougher materials such as alloys, stainless & manganese steels, etc.


  • M35 is not as brittle as M42 & can withstand more torsional stress.
  • M35 is a development of M2 and contains 5% cobalt which provides improved hardness, wear resistance and red hardness.


  • For most general purpose, heavy duty, drilling operations for tougher materials.
  • Well suited for heavy duty operations in high tensile strength, low machinability, ferrous metals and alloys.
  • The 135° split point works for drilling alloy steels, manganese steels, harder stainless steels and a variety of other tough ferrous alloys.
  • Split point design is self-centering and helps to reduce the thrust requirements.
  • Suitable lubricating/cutting oils or appropriate coolant fluids are recommended for most drilling operations to achieve optimal performance & extended tool life.


  • Right hand (clockwise rotation) cutting direction.
  • Standard two flute design.
  • Standard spiral, helical flutes.
  • Straight shanks that corresponds to the drill diameter.
  • Heat treatment process is controlled by metallurgical lab using advanced computerized instrumentation.

Technical Data

  • Manufactured from cobalt steel.
  • Cylindrically ground.
  • Ground from the solid.
  • Heavy duty, general purpose drills.
  • 135° point angle and a heavier web.
  • Bronze oxide/bright finish depending upon our stock.
T&O Letter S RH M35 Cobalt 135? Jobbers Drill
Product Specifications
Brand T&O
Size S
Size Type Letter
Finish Coating Bright Finish
Tool Material M35 5% Cobalt
Drill Point Angle 135°
Decimal Size .3480"
Drill Grade Heavy Duty
Drill Type Jobbers Length
Diameter .3480"
Cutting Direction Right Hand
Flute Length 3-1/2"
Flute Shape Standard Spiral, Helical Flute
Manufacturing Method Ground From the Solid
OC_Wood X
Length Style Jobbers Length
Overall Length 4-7/8"
Point Sharpening Type Split Point
Shank Style Straight Shank
Prop. 65 Yes
Type M35 Cobalt Jobbers Length Twist Drills
Weight 0.0877 lbs.
Country of Origin SOUTH AFRICA
Prop 65 Warning Many metalworking products do contain metals that are included in the latest Prop 65 warning. Exposure to the elements can be harmful. May cause cancer and reproductive harm.

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