7/16"-20 Drill Bits | McMaster-Carr

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Number of Taps

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Tap Sizes Included

1 each of sizes 6-32, 6-40, 8-32, 8-36, 10-24, 10-32, 12-24, 12-28, 1/4"-20, 1/4"-28

1 each of sizes 6-40, 8-36, 10-24, 10-32, 1/4-28, 5/16-24, 3/8-24, 7/16-20, and 1/2-20

5/16"-18, 5/16"-24, 3/8"-16, 3/8"-24, 7/16"-14, 7/16"-20, 1/2"-13, and 1/2"-20

5/16"-24

6-32

6-40, 8-36, 10-24, 10-32, 1/4"-28, 5/16"-24, 3/8"-24, 7/16"-20, and 1/2"-20

7/16"-14

7/16"-20

Drill Bit Sizes Included

1 each of sizes 5/16", 25/64", 27/64", 29/64", 36 ga, 33 ga., 25 ga., 21 ga., 16 ga., 15 ga., 7 ga., 3 ga., F, I, Q, and U

1/4"

2 each of size 29 ga.

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EAR99

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11 Products

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—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.

Plug Chamfer—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.

	Drill Bit Sizes Included	Container Type	Includes	Tap Chamfer Type		Each
Carbon Steel







	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, 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, 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, Z	Plastic Case	Die Wrench (2), Extractor (5), Tap Wrench (3), Thread Gauge (2)	Taper, Plug	82955A11	0000000

Chip-Clearing Tap and Drill Bit Sets for Through Holes

Also known as gun taps, the taps in these sets have spiral-point flutes that push chips ahead of the tap and out of through holes. Because they don't need to be reversed to prevent buildup, they produce threads more efficiently than standard taps and are suitable for production work. Taps have a square shank for compatibility with tap wrenches and tap holders for drill presses and milling machines. With a plug chamfer, they have 3-5 chamfered cutting threads, so they're suitable for start-to-finish tapping. All taps and drill bits are made of high-speed steel for use on most metal and plastic.

	Chamfer Type	Tap Sizes Included	Overall Lg.	Thread Type	No. of Flutes	Pitch Dia. Limit	Drill Bit Sizes Included	Drill Bit Material	Container Type		Each
Gold-Oxide High-Speed Steel Tap



	18	Plug	6-40 8-36 10-24 10-32 1/4"-28 5/16"-24 3/8"-24 7/16"-20 1/2"-20	2 1/16" 2 7/32" 2 15/32" 2 5/8" 2 7/8" 3 1/8" 3 5/32" 3 3/8"	UNF	2, 3	H2, H3	29/64" 25/64" 33 ga. 29 ga. 25 ga. 21 ga. 3 ga. I Q	Gold-Oxide High-Speed Steel	Metal Case	27275A32	0000000

Hex-Shank Tap and Drill Bit Sets

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

Uncoated High-Speed Steel Tap—Uncoated high-speed steel taps have a longer tool life than carbon steel. They are strong enough for most jobs but don’t last as long as other high-speed steel taps. Use them for small-scale jobs.

Plug Chamfer—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.

Black-Oxide High-Speed Steel Drill Bit—Black-oxide high-speed steel drill bits have a longer tool life than carbon steel. They cut with less friction than uncoated drill bits.

	Chamfer Type	Tap Sizes Included	Overall Lg.	Thread Type	No. of Flutes	Pitch Dia. Limit	Drill Bit Sizes Included	Drill Bit Material	Container Type		Each
Uncoated High-Speed Steel Tap



	36	Plug	1 each of sizes: 6-32 6-40 8-32 8-36 10-24 10-32 12-24 12-28 1/4"-20 1/4"-28 5/16"-18 5/16"-24 3/8"-24 3/8"-16 7/16"-14 7/16"-20 1/2"-13 1/2"-20	2" 2 1/8" 2 5/32" 2 11/64" 2 3/8" 2 1/2" 2 15/16" 3 5/32" 3 7/32"	UNC, UNF	3, 4	H2, H3	1 each of sizes: 25/64" 27/64" 29/64" 5/16" 36 ga. 33 ga. 25 ga. 21 ga. 16 ga. 15 ga. 7 ga. 3 ga. F I Q U 2 each of sizes: 29 ga.	Black-Oxide High-Speed Steel	Metal Case	2727A19	0000000

Tap and Drill Bit Sets

Metal Case

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

Uncoated High-Speed Steel Drill Bit—Uncoated high-speed steel drill bits have a longer tool life than carbon steel. They are strong enough for most jobs but don’t last as long as other high-speed steel drill bits. Use them for small-scale jobs.

	Chamfer Type	Tap Sizes Included	Overall Lg.	Thread Type	No. of Flutes	Pitch Dia. Limit	Drill Bit Sizes Included	Drill Bit Material	Container Type		Each
Uncoated High-Speed Steel Tap



	18	Plug	1 each of sizes: 6-40 8-36 10-24 10-32 1/4-28 5/16-24 3/8-24 7/16-20 1/2-20	2" 2 1/8" 2 3/8" 2 1/2" 2 23/32" 2 15/16" 3 5/32" 3 3/8"	UNC, UNF	3, 4	H2, H3	29/64" 25/64" 33 ga. 29 ga. 25 ga. 21 ga. 3 ga. I Q	Uncoated High-Speed Steel	Metal Case	2610A12	0000000

Helical Threaded Insert Assortments with Installation Tools

Repair damaged threads or create new ones. These convenient assortments include helical inserts, an installation tool for each thread size, a drill bit, and a tap. The inserts are also known as Heli-Coil inserts.

Pronged—The prong attaches to an installation tool for precise control as you drive inserts in. Remove the prong with a punch or break-off tool before inserting a screw.

18-8 Stainless Steel—The choice for wet and outdoor environments, these inserts resist rust and mild chemicals.

	Drill Bit Size	For Max. Hole Dia.		Each
Pronged







	18-8 Stainless Steel

	18	7/16"-20 Thread × 0.438" Installed Lg. (6 Each) 7/16"-20 Thread × 0.656" Installed Lg. (6 Each) 7/16"-20 Thread × 7/8" Installed Lg. (6 Each) Drill Bit Installation Tool Prong Break-Off Tool Through-Hole Tap	Fine	29/64"	0.453"	91732A935	000000


	60	1/2"-20 Thread × 3/4" Installed Lg. (6 Each) 1/4"-28 Thread × 3/8" Installed Lg. (12 Each) 3/8"-24 Thread × 0.562" Installed Lg. (12 Each) 5/16"-24 Thread × 0.469" Installed Lg. (12 Each) 7/16"-20 Thread × 0.656" Installed Lg. (6 Each) 10-32 Thread × 0.285" Installed Lg. (12 Each) Drill Bits Installation Tools Through-Hole Taps	Fine	13/64" 17/64" 21/64" 25/64" 29/64" 33/64"	0.203" 0.266" 0.328" 0.391" 0.453" 0.516"	90285A124	000000

Quick-Change Hex Shank Drill Taps for Drills and Screwdrivers

Save time when you need to change drill taps frequently. The grooved shank snaps directly into drills, power screwdrivers, and other tools that accept a 1/4" hex shank. However, they’re not rated for impact drivers. With a drill bit point to drive into the workpiece, these taps can drill and tap holes in a single step. 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 High-Speed Steel—Uncoated taps are strong enough for most tapping jobs but have the shortest tool life.

Titanium Nitride (TiN)-Coated High-Speed Steel—Titanium Nitride (TiN) coated taps resist heat and wear better than uncoated taps, letting them last up to twice as long.

	Thread			Drill Bit								Plug Chamfer
	Size	Lg.	Overall Lg.	Size	Decimal Size Equiv.	Point Angle	Flute Type	No. of Flutes	Thread Type	Pitch Dia. Limit	Hex Shank Size		Each
Uncoated High-Speed Steel



		7/16"-20	1 1/4"	4 3/4"	25/64"	0.3906"	118°	Spiral	2	UNF	H3	1/4"	3464A62	000000


		Titanium Nitride (TiN)-Coated High-Speed Steel



				7/16"-20	1 1/4"	4 3/4"	25/64"	0.3906"	118°	Spiral	2	UNF	H3	1/4"	3464A123	00000

Drill Taps

Spiral 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.

Uncoated High-Speed Steel—Uncoated taps are strong enough for most tapping jobs but have the shortest tool life.

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

	Thread			Drill Bit							Plug Chamfer
	Size	Lg.	Overall Lg.	Size	Decimal Size Equiv.	Point Angle	Flute Type	No. of Flutes	Thread Type	Pitch Dia. Limit		Each
Uncoated High-Speed Steel



		7/16"-20	1 1/4"	3 3/4"	25/64"	0.3906"	110°	Spiral	2	UNF	H3	2748A51	000000

Helical Threaded Inserts with Installation Tools

Drill Bit, Installation Tool

and Through-Hole Tap

Quickly restore stripped threads—these inserts come with through-hole taps and installation tools. The tough coils on these inserts expand once installed to anchor in a tapped hole.

Pronged—The prong attaches to an installation tool for precise control as you drive inserts in. Remove the prong with a punch or break-off tool before inserting a screw.

18-8 Stainless Steel—The choice for wet and outdoor environments, these inserts resist rust and mild chemicals.

	For Max. Hole Dia.	No. of Inserts Included	Includes		Each
Pronged







	18-8 Stainless Steel

	7/16"-20	0.438"	29/64"	0.453"	10	Drill Bit Installation Tool Through-Hole Tap	98356A143	000000


	7/16"-20	0.656"	29/64"	0.453"	10	Drill Bit Installation Tool Through-Hole Tap	91732A936	00000