4-40 Drill Bits | McMaster-Carr

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	Thread Type Thread Type

	System of Measurement System of Measurement

Inch

Metric

	Thread Size Thread Size	Show

4-40

	Thread Size Thread Size	Hide

	Thread Pitch Thread Pitch

	Number of Drill Bits Number of Drill Bits

	For Use On For Use On

	Component Component

Tap

Drill Bit

Die

	Number of Pieces Number of Pieces

117

	Chamfer Type Chamfer Type

Plug

Taper

	Flute Type Flute Type

	Straight
	Spiral

	Number of Taps Number of Taps

	Drill Bit Material Drill Bit Material

High-Speed Steel

Steel

	Shape Shape

	Hex

	Drill Bit Finish Drill Bit Finish

Uncoated

Black Oxide

	Pipe Size Pipe Size

1/8

	Individual/Set Individual/Set

Individual

Set

	Application Application

Through-Hole Threading

Closed-End Hole Threading

	Container Type Container Type

Plastic Case

	Width Width

5/8"

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

	Shank Type Shank Type


Round	Hex

Square

	Material Material

5 Products

Tap and Drill Bit Sets

Set with Plastic Case

Drill and tap a variety of hole sizes. These taps and drill bits are for use on metal and plastic.

Carbon steel taps are for thread repair and occasional tapping.

Plug-chamfer taps are a versatile choice for most tapping applications. With 3-5 chamfered cutting threads, they require moderate torque and are often used for start-to-finish tapping of through holes and closed-end holes. However, they do not start threads as easily as taper chamfers. When using them to tap closed-end holes, be sure to leave sufficient space at the bottom for chips to accumulate.

Uncoated Carbon Steel Taps
No. of Pieces	Chamfer Type	Tap Sizes Included	No. of Flutes	Drill Bit Sizes Included	Drill Bit Material	Container Type	Includes		Each
13	Plug	1 each of sizes: 4-40 6-32 8-32 10-24 10-32 1/4"-20	3, 4	43 ga. 35 ga. 29 ga. 25 ga. 21 ga. 7 ga.	Black Oxide High-Speed Steel	Plastic Case	Tap Wrench	0000000	000000

Tap, Die, and Drill Bit Sets

Cut and repair threads and drill holes in many different sizes. Tap and die wrenches are included. The dies are hex shaped for use with conventional wrenches. The taps are made of carbon steel and are recommended for thread repair and occasional tapping.

Taper-chamfer taps have 7-10 chamfered threads at the tip for cutting into the workpiece. They require less torque than other chamfer types, making them a good choice for starting threads and tapping through holes. However, a longer taper means that they cannot thread as close to the bottom of closed-end holes

Carbon Steel
No. of Pieces	Tap Sizes Included	Die Sizes Included	Drill Bit Sizes Included	Container Type	Includes		Each
Right-Hand Thread
117	4-40, 6-32, 8-32, 10-24, 10-32, 12-24, 1/8"-27, 1/8"-28, 1/4"-20, 1/4"-28, 5/16"-18, 5/16"-24, 3/8"-16, 3/8"-24, 7/16"-14, 7/16"-20, 1/2"-13, 1/2"-20, M3 × 0.50 mm, M4 × 0.70 mm, M4 × 0.75 mm, M5 × 0.80 mm, M5 × 0.90 mm, M6 × 1.00 mm, M7 × 1.00 mm, M8 × 1.00 mm, M8 × 1.25 mm, M9 × 1.00 mm, M9 × 1.25 mm, M10 × 1.25 mm, M10 × 1.50 mm, M11 × 1.50 mm, M12 × 1.50 mm, and M12 × 1.75 mm	4-40, 6-32, 8-32, 10-24, 10-32, 12-24, 1/8"-27, 1/8"-28, 1/4"-20, 1/4"-28, 5/16"-18, 5/16"-24, 3/8"-16, 3/8"-24, 7/16"-14, 7/16"-20, 1/2"-13, 1/2"-20, M3 × 0.50 mm, M4 × 0.70 mm, M4 × 0.75 mm, M5 × 0.80 mm, M5 × 0.90 mm, M6 × 1.00 mm, M7 × 1.00 mm, M8 × 1.00 mm, M8 × 1.25 mm, M9 × 1.00 mm, M9 × 1.25 mm, M10 × 1.25 mm, M10 × 1.50 mm, M11 × 1.50 mm, M12 × 1.50 mm, and M12 × 1.75 mm	5/64", 7/64", 5/32", 1/4", 19/64", 5/16", 21/64", 3/8", 25/64", 13/32", 27/64", 29/64", 43 ga., 39 ga., 36 ga., 30 ga., 29 ga., 25 ga., 21 ga., 20 ga., 16 ga., 9 ga., 7 ga., 3 ga., B, F, H, I, J, O, Q, R, S, U, and Z	Plastic Case	Die Wrench (2), Extractor (5), Tap Wrench (3), Thread Gauge (2)	00000000	0000000

Hex Shank Combination Drill Bits/Taps for Drills and Screwdrivers

With a drill bit point to drive into the workpiece, these taps can drill and tap holes in a single step. A 1/4" hex shank connects them directly to tools such as drills and power screwdrivers. They're made of high-speed steel and are for use on most metal and plastic.

Their spiral flutes keep chips clear by drawing them back toward the tap and out of the hole. All have a plug chamfer with 3-5 chamfered cutting threads, so they're suitable for start-to-finish tapping.

Uncoated taps are strong enough for most tapping jobs but have the shortest tool life.

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

Inch

Thread			Drill Bit							Plug Chamfer
Size	Lg.	Overall Lg.	Size	Decimal Size Equivalent	Point Angle	No. of Flutes	Thread Type	Pitch Dia. Limit	Hex Shank Size		Each
Uncoated High-Speed Steel
4-40	3/8"	2 7/8"	43 ga.	0.089"	118°	2	UNC	H2	1/4"	0000000	000000

Combination Drill Bit/Taps

Spiral Flute

Straight Flute

Drill holes and cut threads without switching tools. Made of high-speed steel, these taps are for use on most metal and plastic. The square shank is compatible with tap holders for drill presses and milling machines. All have a plug chamfer with 3-5 chamfered cutting threads, so they're suitable for start-to-finish tapping.

Taps with spiral flutes keep chips clear by drawing them back toward the tap and out of the hole.

Uncoated taps are strong enough for most tapping jobs but have a shorter tool life. Titanium nitride (TiN) coated taps resist heat and wear better than uncoated taps, letting them last up to twice as long.

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

Inch

Thread			Drill Bit						Plug Chamfer
Size	Lg.	Overall Lg.	Size	Decimal Size Equivalent	Point Angle	Flute Type	Thread Type	Pitch Dia. Limit		Each
Uncoated High-Speed Steel
4-40	3/8"	1 7/8"	43 ga.	0.089"	110°	Spiral	UNC	H2	0000000	000000
Titanium Nitride (TiN) Coated High-Speed Steel
4-40	3/8"	1 7/8"	43 ga.	0.089"	118°	Straight	UNC	H2	0000000	00000