7 3/4" Long Drill Bits | McMaster-Carr

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.

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	Decimal Size Equiv.	Overall Lg.	Max. Drilling Dp.	Type	Size	Drill Bit Point Type		Each
Extended Length





				Black Oxide
				31/64"	0.4844"	7 3/4"	4.02"	Round	31/64"	Standard	29315A156	000000
				1/2"	0.5"	7 3/4"	4"	Round	1/2"	Standard	29315A161	00000



						Titanium Nitride (TiN) Coated
						31/64"	0.4844"	7 3/4"	4.75"	Round	31/64"	Standard	28965A816	00000
						1/2"	0.5"	7 3/4"	4.75"	Round	1/2"	Standard	28965A757	00000

Cobalt Steel Drill Bits

Jobbers' Length

Morse Taper Shank

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





				Uncoated
				27/64"	0.4219"	7 3/4"	3.88"	Morse Taper	Morse 2	Split	3068A56	000000
				7/16"	0.4375"	7 3/4"	3.88"	Morse Taper	Morse 2	Split	3068A17	00000

				Extended Length





								Uncoated
								1/2"	0.5"	7 3/4"	3.75"	Round	1/2"	Split	3063A142	00000

Carbide-Tipped Drill Bits

Extended Length

Round Shank

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.

					Shank
	Drill Bit Size	Decimal Size Equiv.	Overall Lg.	Max. Drilling Dp.	Type	Size	Drill Bit Point Type		Each
Extended Length





				Uncoated
				1/2"	0.5"	7 3/4"	4"	Round	1/2"	Standard	29465A37	000000

Reversible-Hex Screwdriver/Nutdrivers

6 Sizes

External

Hex

Phillips

Slotted

Bits have a different tip at each end and snap into the shaft. A ball detent holds the bit in place. To use as nutdriver, remove the bit and turn fasteners with the shaft, which is also reversible.

Ultra Grip—Ultra-grip drivers have a multicomponent handle that provides comfort and the best possible grip for achieving maximum torque.

6 Sizes—For those with six sizes, bits turn four screw sizes and the shaft two external hex sizes.

					Shaft			Material
	For Bit Hex Shank Size	No. of Sizes	Sizes Included	Overall Lg.	Lg.	Overall Wd.	Bit-Holding Mechanism	Shaft	Bit	Handle	Features	For Drive Style		Each
Ultra Grip


		1/4", 5/16"	6	Phillips: No. 1, No. 2 Slotted: 3/16", 1/4" External Hex: 1/4", 5/16"	7 3/4"	2 1/4"	7/16"	Ball Detent	Chrome-Plated Steel	Steel	Plastic	Bit storage inside shaft	External Hex, Phillips, Slotted	6127A38	00000