178mm Long Drill Bits | McMaster-Carr

Black Oxide—The dark finish increases wear resistance and reduces friction to improve chip flow, so these bits can last 50% longer than uncoated bits.

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







				Black Oxide

				15.5	0.6102"	178	89	Round	15.5 mm	Standard	Dormer Pramet	2958A176	000000


				16.0	0.6299"	178	88	Round	16 mm	Standard	Dormer Pramet	2958A177	00000

Carbide-Tipped Drill Bits

Jobbers' Length

Round Shank

Extended Length

Round Shank


Split	Standard

Performance similar to solid carbide but at a lower price point. Like carbide bits, these are stronger than cobalt and high-speed steel and maintain their sharp edges when drilling abrasive material. However, when drilling tough metals like iron and hardened steel, upgrade to carbide for longer life.

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

Extended Length—Drill through panels and thick workpieces with our longest bits. Their length is good for creating deep holes but makes them less rigid than other bits. As a result, they are more prone to wobbling or breaking, especially when drilling hard materials.

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







				Uncoated

				16.0	0.6299"	178	132	Round	16 mm	Standard	ICS	28595A17	0000000


				16.0	0.6299"	178	132	Round	16 mm	Split	ICS	28595A97	000000


				Extended Length







								Uncoated

								10.0	0.3937"	178	90	Round	10 mm	Standard	ICS	29465A119	00000

High-Speed Steel Drill Bits for Plastic

The precision-ground, 60° point penetrates gradually to prevent cracking and chipping. It also reduces heat that can deform the material. Use these bits for drilling into acrylic, laminate, and other plastics. They're made of wear-resistant high-speed steel.

Jobbers' Length About Jobbers' Length

					Shank
	Drill Bit Size, mm	Decimal Size Equiv.	Overall Lg., mm	Max. Drilling Dp., mm	Type	Size, mm	Point Angle	Drill Bit Point Type	Mfr.		Each
Uncoated



		15.5	0.6102"	178	120	Round	15.5	60°	Standard	ICS	27465A438	000000


		16	0.6299"	178	120	Round	16	60°	Standard	ICS	27465A439	00000

Chip-Clearing High-Speed Steel Drill Bits

Jobbers' Length

Parabolic Flute

Round Shank

Split

With flutes that lift chips out of the hole, you don't have to stop drilling to clear these bits manually. They improve coolant flow to dissipate heat and prevent clogs that can damage the bit and ruin the hole. High-speed steel is good for general purpose drilling in most metals.

Parabolic Flute—A U-shaped groove on the flutes cuts faster and clears chips more quickly than high-helix bits, so these are better for drilling deeper holes.

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

Uncoated—The most economical option, uncoated bits perform best when used on low-carbon steel and aluminum. Polished to reduce friction, they're 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

				16.0	0.6299"	178	120	Parabolic	Round	16	Split	Dormer Pramet	2754A94	000000

Impact Wrench Reamers for Hole Alignment

Driven by the high torque of an impact wrench, these reamers enlarge holes to correct misalignment and overlap faster than with a power drill. The tapered shape fits into narrow holes and makes more contact than straight reamers when removing material. Also known as bridge and car reamers.

Hex Shank

Helix Flute

The shank fits hex impact sockets, so you can use an impact wrench to both ream the hole and install a fastener.

Helix Flute—Prevent clogging when removing excess material with helix flutes. They also leave a smoother finish than straight flutes.

High-Speed Steel—Durable and wear resistant, these are good for general purpose reaming in most materials.

Left-Hand Spiral—These reamers push chips downward as they cut, so they're often used in through holes.

Strong Hold—Magnets on the shank’s end keep these reamers from accidentally falling out of your tool.

					Lg., mm
	Reamer Dia. (A)	Reamer Dia. (B), mm	Material	Hex Shank Size, mm	Flute	Overall	Spiral Direction	Cutting Dia. Tolerance, mm	Performance	For Use On	Mfr.		Each
Helix Flute







				Metric

				20.0000 mm	11.9000	High-Speed Steel	32	114	178	Left Hand	0 to 0.254	Strong Hold	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	ICS	3239A215	000000


				22.0000 mm	13.9000	High-Speed Steel	36	127	178	Left Hand	0 to 0.254	Strong Hold	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	ICS	3239A216	000000
				28.0000 mm	21.5000	High-Speed Steel	41	127	178	Left Hand	0 to 0.254	Strong Hold	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	ICS	3239A219	000000
				32.0000 mm	25.0000	High-Speed Steel	46	127	178	Left Hand	0 to 0.254	Strong Hold	Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel	ICS	3239A222	000000