149mm Long Drill Bits | McMaster-Carr

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.

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







				Uncoated

				12.0	0.4724"	149	100.8	Round	12 mm	Standard	Viking Norseman Drill	2951A149	000000	—	———	0




						Black/Gold Oxide

						12.0	0.4724"	149	110.3	Round	12 mm	Split	Viking Norseman Drill	30565A336	00000	5	30565A451	000000


						12.2	0.4803"	149	110.3	Round	12.2 mm	Split	Viking Norseman Drill	30565A337	00000	—	———	0

Left-Hand Cobalt Steel Drill Bits

Jobbers' Length

Round Shank

Split

The flutes spiral in the opposite direction of other bits and stay sharp longer than high-speed steel. They’re 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.

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.		1-4	5-Up
Jobbers' Length







				Uncoated

				12.0	0.4724"	149	111	Round	12 mm	Split	Viking Norseman Drill	3474A72	000000	000000