43mm 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.

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.

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







				Black Oxide

				1.55	0.061"	43	16.9	Round	1.6 mm	Standard	2958A22	00000


				1.6	0.063"	43	16.8	Round	1.6 mm	Standard	2958A38	0000
				1.7	0.0669"	43	16.6	Round	1.7 mm	Standard	2958A41	0000




						Titanium Nitride (TiN) Coated

						1.6	0.063"	43	16.8	Round	1.6 mm	Standard	8950A36	0000


						1.65	0.065"	43	16.7	Round	1.7 mm	Standard	8950A37	0000


						Short Length







										Black Oxide

										2.4	0.0945"	43	9.1	Round	2.4 mm	Standard	28255A19	0000


										2.5	0.0984"	43	9	Round	2.5 mm	Standard	28255A21	0000
										2.6	0.1024"	43	6.5	Round	2.6 mm	Standard	28255A81	0000




												Titanium Nitride (TiN) Coated

												2.4	0.0945"	43	6	Round	2.4 mm	Split	2979N48	0000


												2.5	0.0984"	43	14	Round	2.5 mm	Split	2979N15	0000
												2.6	0.1024"	43	6.5	Round	2.6 mm	Split	2979N49	0000

Cobalt Steel Drill Bits


Jobbers' Length Round Shank	Short Length Round Shank

Standard

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.

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.

Titanium Aluminum Nitride (TiAlN) Coated—The hardest and most wear-resistant coating, especially at high temperatures. These bits are best for hard and abrasive materials, such as iron, titanium, and fiberglass.

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.

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
Jobbers' Length







				Titanium Nitride (TiN) Coated

				1.55	0.061"	43	20	Round	1.6 mm	Standard	5058N15	00000


				1.6	0.063"	43	20.1	Round	1.6 mm	Split	5058N53	0000
				1.65	0.065"	43	20	Round	1.7 mm	Split	5058N16	0000
				1.7	0.0669"	43	20	Round	1.7 mm	Split	5058N115	0000




						Titanium Aluminum Nitride (TiAlN) Coated

						1.55	0.061"	43	20	Round	1.6 mm	Split	2753A216	00000


						1.65	0.065"	43	20	Round	1.7 mm	Split	2753A217	00000




								Gold Oxide

								1.55	0.061"	43	16.9	Round	1.6 mm	Split	29355A23	0000


								1.6	0.063"	43	16.8	Round	1.6 mm	Split	29355A24	0000
								1.65	0.065"	43	16.7	Round	1.7 mm	Split	29355A25	0000
								1.7	0.0669"	43	16.6	Round	1.7 mm	Split	29355A26	0000


								Short Length







												Titanium Nitride (TiN) Coated

												2.5	0.0984"	43	9.1	Round	2.5 mm	Split	2456N144	0000


												2.6	0.1024"	43	8.9	Round	2.6 mm	Split	2456N145	0000




														Uncoated

														2.5	0.0984"	43	9.1	Round	2.5 mm	Split	2456N116	0000


														2.6	0.1024"	43	8.9	Round	2.6 mm	Split	2456N117	0000

Carbide Drill Bits

Jobbers' Length

Round Shank

The hardest and most wear-resistant drill bits you can buy. Carbide bits stay sharp at high temperatures and faster speeds for the best performance on hard and difficult-to-machine materials. They last 10 to 20 times longer than their closest alternative, cobalt steel. Carbide can be brittle, however, so these bits require a rigid machine tool holder to prevent breakage and should not be used in hand drilling applications.

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

Uncoated—Excellent for a range of materials but won't last as long as coated bits.

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







				Uncoated

				1.6	0.063"	43	20	Round	1.6 mm	Four Facet	3030A14	000000


				1.70	0.0669"	43	17.45	Round	1.7 mm	Four Facet	3030A67	00000

Left-Hand High-Speed Steel Drill Bits


Jobbers' Length Round Shank	Standard

With flutes that spiral in the opposite direction of other bits, these are primarily used to remove stripped screws. Choose a bit that’s slightly smaller than the diameter of the screw’s head. Set your power tool to rotate in reverse. Slowly drill in the center of the screw head, maintaining constant pressure. As the bit penetrates, it will catch onto the screw and reverse it out of the hole. If the screw is badly stripped, you might need to punch a starter hole. Also known as reverse-flute bits. High-speed steel is the versatile choice for drilling most metals.

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				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

				1.6	0.063"	43	15.2	Round	1.6 mm	Standard	29855A34	000000	00000


				1.7	0.0669"	43	6.8	Round	1.7 mm	Standard	29855A119	00000	0000