8.6 mm Drill Bits | McMaster-Carr

				Shank					Each
Drill Bit Size	Decimal Size Equivalent	Overall Lg.	Max. Drilling Dp.	Type	Size	Point Style	Specifications Met	For Use On		Each
Metric
Black-Oxide High-Speed Steel
8.6 mm	0.3386"	125mm	63.8mm	Round	8.6mm	Standard	DIN 338	Steel, Iron, Stainless Steel	00000000	000000
Black-and-Gold Oxide High-Speed Steel
8.6 mm	0.3386"	121mm	86.1mm	Round	8.6mm	Split	NAS907 Type B	Steel, Iron, Stainless Steel	000000000	0000

Chip-Clearing Drill Bits

Parabolic Flute

These jobbers'-length bits have the rigidity and length required for most applications. The flutes are designed to lift chips out of the hole, reducing clogging and improving coolant flow.

Parabolic spiral flute drill bits have wider flutes for more efficient chip evacuation than spiral-flute bits.

Drill bits with a split point keep centered without a pilot hole.

For technical drawings and 3-D models, click on a part number.

				Shank
Drill Bit Size	Decimal Size Equivalent	Overall Lg.	Max. Drilling Dp.	Type	Size	Point Style	For Use On	Specifications Met		Each
Metric—Parabolic Spiral Flute
Uncoated High-Speed Steel
8.6 mm	0.3386"	125mm	81mm	Round	8.6mm	Split	Steel, Iron, Aluminum, Brass, Bronze, Plastic	DIN 338	0000000	000000

Cobalt Steel Drill Bits

Uncoated

These jobbers'-length bits have the rigidity and length required for most applications. Made of cobalt steel, which has better heat and wear resistance than high-speed steel, they can run up to 25% faster and have a longer tool life.

Drill bits with a split point keep centered without a pilot hole.

For technical drawings and 3-D models, click on a part number.

				Shank					Each
Drill Bit Size	Decimal Size Equivalent	Overall Lg.	Max. Drilling Dp.	Type	Size	Point Style	Specifications Met	For Use On		Each
Metric
Uncoated Cobalt Steel
8.6 mm	0.3386"	121mm	86.1mm	Round	8.6mm	Split	NAS907 Type J	Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel	000000000	000000

Hardened Undersized High-Speed M2 Tool Steel Rods

Yield Strength: Not Rated
Hardness: Rockwell C60 (Very Hard)

These rods, also known as drill blanks, have an undersized diameter for machining your own jobbers'-length drill bits. They're hardened for increased abrasion and impact resistance. M2 tool steel offers a nice balance of wear resistance and machinability. It has a high molybdenum content, which allows it to maintain sharp cutting edges even at elevated temperatures.

For technical drawings and 3-D models, click on a part number.

Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.

Dia.	Dia. Tolerance	Drill Bit Size	Lg.	Mechanical Finish	Straightness Tolerance		Each
8.6mm	-0.0050mm to 0.0000mm	8.6 mm	4 3/4"	Precision Ground	0.012" per ft.	00000000	00000

Easy-to-Install Thread-Locking Inserts with Installation Tools

A closed-end tap, drill bit, and installation bit are included with these inserts. Also known as E-Z Lok, they use Loctite® adhesive to keep them in place. The adhesive reaches full strength after 72 hours. A black-phosphate finish provides mild corrosion resistance.

Choose inserts with a thick wall for greater strength than thin-wall inserts, or to fill a large hole.

For technical drawings and 3-D models, click on a part number.

Metric

		For Tap
Thread Size	Thread Pitch, mm	Thread Size	Thread Pitch, mm	Installed Lg.	Drill Bit Size	For Max. Hole Dia.	Drive Style	No. of Inserts Included		Each
Black-Phosphate Steel with Thick Wall
M6	1	M10	1.5	10.5mm	8.6 mm	8.6mm	Slotted	10	000000000	000000