105mm Long Drill Bits | McMaster-Carr

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





				Gold Oxide

				6.4	0.252"	105	69.9	Round	6.4 mm	Split	30565A287	00000	—	———	0
				6.5	0.2559"	105	69.9	Round	6.5 mm	Split	30565A288	0000	10	30565A438	000000
				6.6	0.2598"	105	69.9	Round	6.6 mm	Split	30565A289	0000	—	———	0
				6.7	0.2638"	105	69.9	Round	6.7 mm	Split	30565A291	0000	10	30565A439	00000
				6.8	0.2677"	105	69.9	Round	6.8 mm	Split	30565A292	0000	10	30565A44	00000
				6.9	0.2717"	105	69.9	Round	6.9 mm	Split	30565A293	0000	—	———	0
				7.0	0.2756"	105	69.9	Round	7 mm	Split	30565A294	0000	10	30565A441	00000




						Uncoated

						6.5	0.2559"	105	62.7	Round	6.5 mm	Standard	2951A137	0000	—	———	0
						7.0	0.2756"	105	69.1	Round	7 mm	Standard	2951A138	0000	—	———	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		1-9	10-Up
Jobbers' Length





				Uncoated

				6.5	0.2559"	105	73	Round	6.5 mm	Split	3474A59	000000	000000
				7.0	0.2756"	105	73	Round	7 mm	Split	3474A61	00000	00000