3.9mm Shank Size Drill Bits | McMaster-Carr

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System of Measurement

Drill Bit Size

Decimal Size Equivalent

Material

High-Speed Steel

Length Class

For Use On

Stainless Steel

Shank Size

0.005" to 0.04"

0.008" to 1/16"

0.012" to 0.015"

0.012" to 5/32"

0.012" to 0.291"

0.014" to 0.039"

0.014" to 5/32"

0.02" to 0.291"

0.028" to 5/32"

0.031" to 0.25"

7/64" to 19/32"

0.2 mm to 1.5 mm

0.3 mm to 0.4 mm

0.3 mm to 6.5 mm

0.3 mm to 7.3 mm

0.3 mm to 7.4 mm

0.4 mm to 1.5 mm

0.4 mm to 6.5 mm

0.4 mm to 10 mm

0.5 mm to 6.5 mm

0.5 mm to 7.4 mm

0.5 mm to 10 mm

0.5 mm to 13 mm

0.5 mm to 16 mm

0.5 mm to 19 mm

0.6 mm to 7.3 mm

0.6 mm to 7.4 mm

0.7 mm to 6.5 mm

0.8 mm to 10 mm

1.1 mm to 13 mm

1.5 mm to 10 mm

1.5 mm to 13 mm

1.6 mm to 12.7 mm

1.6 mm to 13 mm

1.6 mm to 16 mm

2.5 mm to 10 mm

2.5 mm to 13 mm

2.5 mm to 16 mm

4.5 mm to 19 mm

5 mm to 20.3 mm

5.2 mm to 25.4 mm

6.4 mm to 9.5 mm

10 mm to 25.4 mm

Finish

Flute Direction

Bit Style

Shank Type

Point Angle

Flute Type

Sold As

Length

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Number of Flutes

Maximum Drilling Depth

DFARS Specialty Metals

Export Control Classification Number (ECCN)

REACH

RoHS

Overall Length

Certification

Military Specification

Drill Bit Point Type

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About Drill Bits

Compare material, finish, length class, and decimal size equivalents.

Material

High-Speed Steel

High-Speed Steel

Versatile bits resist heat and wear to stay sharp

Cobalt Steel

Resist higher temperatures and last twice as long as high-speed steel

Performance

Chip Clearing

Prevent clogs and dissipate heat

High-Speed Steel Drill Bits

Jobbers' Length

Round Shank

Split

Our basic drill bits are also the most versatile. Cut holes in a variety of metals, from the softest aluminum to the hardest steel.

Jobbers' Length—These bits have the balance of rigidity and length needed for most applications.

Gold Oxide—Like black oxide, this finish adds wear resistance and reduces friction for improved chip flow. Because it’s less prone to flaking off, it offers better rust protection when bits aren't in use.

					Shank				Each
	Drill Bit Size, mm	Decimal Size Equiv.	Overall Lg., mm	Max. Drilling Dp., mm	Type	Size	Drill Bit Point Type		1-9	10-Up
Jobbers' Length







				Gold Oxide

				3.9	0.1535"	79	47.6	Round	3.9 mm	Split	30565A259	00000	00000

Cobalt Steel Drill Bits

Jobbers' Length

Round Shank

Split

Tough and wear resistant, cobalt steel bits last at least twice as long as high-speed steel. They can also run up to 25% faster at higher temperatures without being damaged on hard materials, such as nickel.

Jobbers' Length—These bits have the balance of rigidity and length needed for most applications.

Uncoated—Polished to eject chips, these are also known as bright finish bits.

					Shank				Each
	Drill Bit Size, mm	Decimal Size Equiv.	Overall Lg., mm	Max. Drilling Dp., mm	Type	Size	Drill Bit Point Type		1-9	10-Up
Jobbers' Length







				Uncoated

				3.9	0.1535"	79	47.6	Round	3.9 mm	Split	29355A63	00000	00000

Chip-Clearing Cobalt Steel Drill Bits

Jobbers' Length

Parabolic Flute

Round Shank

Split

Avoid clogs and dissipate heat with cobalt bits that last at least twice as long as high-speed steel. The flutes clear chips to improve coolant flow and prevent damage to the bit and the hole. They also speed up drilling since you don't have to stop to clear the bit manually.

Jobbers' Length—These bits have the balance of rigidity and length needed for most applications.

Uncoated—Polished to eject chips, these are also known as bright finish bits.

						Shank
	Drill Bit Size, mm	Decimal Size Equiv.	Overall Lg., mm	Max. Drilling Dp., mm	Flute Type	Type	Size, mm	Drill Bit Point Type		Each
Jobbers' Length







				Uncoated

				3.9	0.1535"	75	41	Parabolic	Round	3.9	Split	2771N741	00000

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