54mm Long Drill Bits | McMaster-Carr

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6 Products

Drill Bit Decimal Size Equivalents

About Drill Bits

Black and Gold Oxide

Split

These jobbers'-length bits have the rigidity and length required for most applications.

Black-oxide and black-and-gold-oxide drill bits produce less friction than uncoated drill 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					Each		Pkg.
Drill Bit Size	Decimal Size Equivalent	Overall Lg.	Max. Drilling Dp.	Type	Size	Point Style	Specifications Met	For Use On		Each	Pkg. Qty.		Pkg.
Metric
Black-and-Gold Oxide High-Speed Steel
2.05 mm	0.0807"	54mm	23.8mm	Round	2.1mm	Split	NAS907 Type B	Steel, Iron, Stainless Steel	000000000	00000	10	000000000	000000
2.1 mm	0.0827"	54mm	23.8mm	Round	2.1mm	Split	NAS907 Type B	Steel, Iron, Stainless Steel	000000000	0000	__	000000	00

Chip-Clearing Cobalt Steel Drill Bits

Uncoated

The parabolic spiral flutes lift chips out of the hole, reducing clogging and improving coolant flow. With better heat and wear resistance than high-speed steel, these cobalt steel bits can run up to 25% faster and have a longer tool life. All are jobbers’ length so they have the rigidity and length required for most applications. A split point keeps the bit centered without a pilot hole.

				Shank
Drill Bit Size	Decimal Size Equivalent	Overall Lg.	Max. Drilling Dp.	Type	Size	Point Style	Specifications Met	For Use On		Each
Metric—Parabolic Spiral Flute
Uncoated Cobalt Steel
2.05 mm	0.0807"	54mm	29mm	Round	2.05mm	Split	DIN 338	Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel	0000000	00000
2.1 mm	0.0827"	54mm	29mm	Round	2.1mm	Split	DIN 338	Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel	00000000	0000
2.15 mm	0.0846"	54mm	29mm	Round	2.15mm	Split	DIN 338	Steel, Hardened Steel, Tool Steel, Iron, Stainless Steel, Nickel	00000000	0000