Precision Twist R High Speed Steel Jobber Drill Bit, Black Oxide Finish, Round Shank with Tang, Spiral Flute, Degree Conventional Point, /" (Pack of )

Precision Twist R08 High Speed Steel Jobber Drill Bit, Black Oxide Finish, Round Shank with Tang, Spiral Flute, 118 Degree Conventional Point, 37/64" (Pack of 1 )
by Precision

Buy new: $51.70 $33.39

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The Precision Twist R08 jobber-length drill bit is a 118-degree notch-point, tanged shank drill bit made of HSS with a steam tempering finish. With general-purpose geometry, and conforming to automotive industry standards, the R08 series provides a secure holding drill bit for drilling into a wide variety of substances with best performance with drilling into steel and cast iron. It is suitable for drilling to a depth up to four times the diameter of the drill.

The R08 series has a type N flute form, with a regular helix angle of 21 to 34 degrees. Steam tempering finish gives a strongly adhering blue oxide surface that retains cutting fluid and prevents chip to tool welding, reducing the formation of a built-up edge. Spiral flutes act as a passageway for chip extraction from the hole and for coolant to enter the hole. Right-hand twist brings chips up and away from the cutting edge.

The principle of a Morse taper is that of the cone in the cone. The trunnion (the male portion – drill shank) and the bore (the female portion – the tool holder) are both uniformly tapered. This system allows for torque to be transferred directly to the drill through the friction between the taper shank and the tool holder. The tang at the end of the taper is used for ejecting the drill bit from the spindle, with the aid of a drift pin.

Drilling, or hole making, is the most common metalworking operation in the world. Twist drill bits are the most common type of drill bit used. Twist drill bits are commonly used to drill holes with hand-operated drills, standalone drill presses, or lathes. The flutes of the drill bit act a passageway for chip extraction from the hole and for coolant to enter the hole. These drill bits have a right-hand twist that brings chips up and away from the cutting edge. They are made to ANSI (fractional sizing) industry standards, which help ensure that drill bits around the world conform to the same specifications.

Precision manufactures machine tools under the following brands: Precision Twist, Precision Dormer, and Union Butterfield. They have locations around the world, and provide tools adhering to ANSI, NAS, and DIN standards.

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