67mm Long Drill Bits | McMaster-Carr

Titanium Nitride (TiN) Coated—Drill at higher speeds and last longer than uncoated and oxide-coated bits, especially on tough materials like hardened steel and nickel.

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





				Gold Oxide

				2.8	0.1102"	67	37.3	Round	2.8 mm	Split	30565A247	00000


				Short Length





								Titanium Nitride (TiN) Coated

								5.5	0.2165"	67	27.9	Round	5.5 mm	Split	2979N23	0000
								6.0	0.2362"	67	27.9	Round	6 mm	Split	2979N24	0000

Coolant-Fed Carbide Drill Bits

The hardest and most wear-resistant bits, these deliver coolant to reduce heat and evacuate chips. They are designed for CNC machines that supply coolant through the spindle rather than an external source, such as a hose and nozzle. Coolant flows directly from holes in the bit's tip onto the drilling surface. This speeds up cuts and leads to excellent performance in deep holes and tough materials such as stainless steel and titanium.

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

Maintenance Length—Shorter than jobbers' length, these bits are more rigid for less wobble when drilling hard material. Also known as mechanics’ bits.

Titanium Aluminum Nitride (TiAlN) Coated—No drill bits last longer. These are the best for high-speed, high-temperature drilling of very hard and abrasive materials, including titanium and fiberglass.

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




				Titanium Aluminum Nitride (TiAlN) Coated

				3.0	0.1181"	67	27.9	Round	6 mm	Four Facet	2396N213	000000


				Maintenance Length
				Round Shank




								Titanium Aluminum Nitride (TiAlN) Coated

								4.0	0.1575"	67	23.9	Round	6 mm	Four Facet	2396N638	00000
								5.0	0.1969"	67	27.9	Round	6 mm	Four Facet	2396N658	00000
								6.0	0.2362"	67	27.9	Round	6 mm	Four Facet	2396N663	00000

Cobalt Steel Drill Bits

Short 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.

Short Length—The most rigid bits for drilling the straightest holes.

Titanium Nitride (TiN) Coated—Drill at higher speeds and last longer than uncoated and oxide-coated bits, especially on tough materials like hardened steel and nickel.

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	Type	Size	Drill Bit Point Type		Each
Short Length





				Titanium Nitride (TiN) Coated

				5.5	0.2165"	67	17	Round	5.5 mm	Split	2456N153	00000
				6.0	0.2362"	67	16	Round	6 mm	Split	2456N154	0000




						Uncoated

						5.5	0.2165"	67	17	Round	5.5 mm	Split	2456N125	0000
						6.0	0.2362"	67	16	Round	6 mm	Split	2456N126	0000

Hole-Starting Cobalt Steel Drill Bits

120° Point Angle

Standard

Create an accurate starting place in your workpiece. Cut an indent with these bits, then continue drilling with a longer bit. The indent prevents slipping so the final hole is centered and precise. Cobalt steel resists wear to stay sharp when cutting hard materials, such as nickel. Also known as spotting drill bits.

Short Length—The most rigid bits for drilling the straightest holes.

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

					Shank			90° Point Angle
	Drill Bit Size, mm	Decimal Size Equiv.	Overall Lg., mm	Max. Drilling Dp., mm	Type	Size, mm	Drill Bit Point Type		Each
Short Length





				Uncoated

				6.0	0.2362"	67	20.3	Round	6	Standard	27445A91	000000