3.9 mm Drill Bits | McMaster-Carr

					Overall
	Holds Drill Bit Sizes	For Drill Bit Length Class	No. of Compartments	No. of Drawers	Wd.	Dp.	Ht.	Material	Lock Type	No. of Keys Included	Features		Each
For Drill Bits







				For Metric Drill Bits

				1.0 mm to 6.9 mm	Jobbers, Maintenance, Short	60	5	14 5/8"	7 3/8"	7 3/4"	Steel	—	—	—	2962A5	0000000


				0.35 mm to 13.0 mm	Jobbers, Maintenance, Short	138	4	26"	12"	12 1/2"	Steel	Keyed	2	Undivided bottom drawer for general storage	8922A44	000000

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.

Black/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	Mfr.		1-9	10-Up
Jobbers' Length







				Black/Gold Oxide

				3.9	0.1535"	79	47.6	Round	3.9 mm	Split	Viking Norseman Drill	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	Mfr.		1-9	10-Up
Jobbers' Length







				Uncoated

				3.9	0.1535"	79	47.6	Round	3.9 mm	Split	Viking Norseman Drill	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	Mfr.		Each
Jobbers' Length







				Uncoated

				3.9	0.1535"	75	41	Parabolic	Round	3.9	Split	Viking Norseman Drill	2771N741	00000

Undersized Hardened Multipurpose M2 High-Speed Tool Steel Rods

These rods, also known as drill blanks, have an undersized diameter for machining your own drill bits. They're hardened for increased abrasion and impact resistance. M2 tool steel offers a nice balance of wear resistance and machinability. It has a high molybdenum content, which allows it to maintain sharp cutting edges even at elevated temperatures.

Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.

Dia., mm	Dia. Tolerance, mm	Drill Bit Size, mm	Lg.	Yield Strength	Hardness	Mechanical Finish		Each
3.9	-0.005 to 0	3.9	3 1/8"	Not Rated	Rockwell C60 (Extra Hard)	Precision Ground	2900A276	00000