M8 Dies | McMaster-Carr

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23 Products

About Nuts, Materials, and Finishes

Use these dies to create external threads on bolts, studs, and rods. They're shaped for use with a die wrench. Loosen and tighten the die with the included set screw to adjust thread depth. Uncoated high-speed steel dies last longer than carbon steel dies when cutting similar material. Titanium-nitride (TiN) coated high-speed steel dies provide up to twice the tool life of uncoated high-speed steel.

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

			Uncoated High-Speed Steel		Titanium Nitride (TiN) High-Speed Steel
Thread Size	Thread Pitch, mm	Includes		Each		Each
Metric Right-Hand Thread
1" OD
M8	1	Set Screw	0000000	000000	0000000	0000000
M8	1.25	Set Screw	0000000	00000	0000000	000000

Left-Hand Screw Thread Dies

Cut left-hand external threads on bolts, studs, and rods. These dies are shaped for use with a die wrench. Loosen and tighten the die with the included set screw to adjust thread depth. High-speed steel dies last longer than carbon steel when cutting similar material.

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

			High-Speed Steel
Thread Size	Thread Pitch, mm	Includes		Each
Metric Left-Hand Thread
1" OD
M8	1.25	Set Screw	0000000	000000

Thread Repairing Dies

Restore rusted and damaged screw threads. These dies are hex shaped for use with conventional wrenches.

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

Metric Right-Hand Thread
Thread Size	Thread Pitch, mm	Wd.	Material		Each
M8	1.25	11/16"	Carbon Steel	0000000	000000

Thread Repairing Dies for Tight Spots

A smaller width than standard hex dies lets you repair rusted and damaged threads in tight spaces. These dies are hex shaped for use with conventional wrenches.

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

Metric Right-Hand Thread
Thread Size	Thread Pitch, mm	Wd., mm	Material		Each
M8	1.25	14	Carbon Steel	00000000	00000

Left-Hand Thread Repairing Dies

Repair rusted and damaged left-hand screw threads. These dies are hex shaped for use with conventional wrenches.

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

Metric Left-Hand Thread
Thread Size	Thread Pitch, mm	Wd.	Material		Each
M8	1.25	11/16"	Carbon Steel	00000000	000000

Two-Piece Thread Repairing Dies

Clamp these dies around your workpiece, so you can start thread repair anywhere along the length of a bolt, stud, or rod. They're hex shaped for use with conventional wrenches.

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

Metric Right-Hand Thread
Thread Size	Thread Pitch, mm	Wd.	Material		Each
M8	1	1"	Tool Steel	0000000	000000
M8	1.25	1"	Tool Steel	0000000	00000

Tap and Die Sets

Use a single set for many sizes of internal and external threads. The taps and dies are for use on most metal and plastic.

Round dies are for cutting threads. Use them with wrenches for round dies. Hex-shaped dies are for thread repair and can be used with conventional wrenches.

Carbon steel taps are for thread repair and occasional tapping.

High-speed steel taps and dies last longer than carbon steel when used on similar material.

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 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-chamfer taps. When using them to tap closed-end holes, be sure to leave sufficient space at the bottom for chips to accumulate.

Carbon Steel
No. of Pieces	Tap Sizes Included	Tap Chamfer Type	Die Shape	Die Sizes Included	Wd.	Container Type	Includes		Each
Right-Hand Thread
24	1/8"-28, M3 × 0.50 mm, M4 × 0.70 mm, M5 × 0.80 mm, M6 × 1.00 mm, M7 × 1.00 mm,; M8 × 1.25 mm, M9 × 1.25 mm, M10 × 1.50 mm, M12 × 1.50 mm, and M12 × 1.75 mm	Plug, Taper	Hex	1/8"-28, M3 × 0.50 mm, M4 × 0.70 mm, M5 × 0.80 mm, M6 × 1.00 mm, M7 × 1.00 mm, M8 × 1.25 mm, M9 × 1.25 mm, M10 × 1.50 mm, M12 × 1.50 mm, M12 × 1.75 mm	1"	Plastic Case	Die Wrench, Tap Wrench	00000000	000000
40	6-32, 8-32, 10-24, 1/8"-27, 1/4"-20, 5/16"-18, 3/8"-16, 7/16"-14, 1/2"-13, M4 × 0.75 mm, M5 × 0.80 mm,; M6 × 1.00 mm, M7 × 1.00 mm, M8 × 1.25 mm, M10 × 1.25 mm, M10 × 1.50 mm, and M12 × 1.75 mm	Plug, Taper	Hex	6-32, 8-32, 10-24, 1/8"-27, 1/4"-20, 5/16"-18, 3/8"-16, 7/16"-14, 1/2"-13, M4 × 0.75 mm, M5 × 0.80 mm, M6 × 1.00 mm, M7 × 1.00 mm, M8 × 1.25 mm, M10 × 1.25 mm, M10 × 1.50 mm, M12 × 1.75 mm	5/8", 1"	Plastic Case	Die Wrench (2), Tap Wrench (3), Thread Gauge	0000000	000000
40	1/8"-28, 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	Plug, Taper	Hex	1/8"-28, 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	5/8", 1"	Plastic Case	Die Wrench (2), Tap Wrench (3), Thread Gauge	0000000	000000
52	1/8"-28, 1/4"-19, 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 × 1.25 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, M14 × 1.25 mm, M14 × 2.00 mm, M16 × 1.50 mm, M16 × 2.00 mm, M18 × 1.50 mm, and M18 × 2.50 mm	Plug, Taper	Hex	1/8"-28, 1/4"-19, 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 × 1.25 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, M14 × 1.25 mm, M14 × 2.00 mm, M16 × 1.50 mm, M16 × 2.00 mm, M18 × 1.50 mm, M18 × 2.50 mm	1", 1 7/16"	Plastic Case	Die Wrench (2), Tap Wrench (3), Thread Gauge	0000000	000000
65	1/8"-28, 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,; M18 × 1.50 mm, M18 × 2.50 mm, M20 × 2.50 mm, M22 × 1.50 mm, M24 × 2.00 mm, and M24 × 3.00 mm; M12 × 1.50 mm, M12 × 1.75 mm, M14 × 1.25 mm, M14 × 1.50 mm, M14 × 2.00 mm, M16 × 1.50 mm, M16 × 2.00 mm,	Plug, Taper	Hex	1/8"-28, 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, M14 × 1.25 mm, M14 × 1.50 mm, M14 × 2.00 mm, M16 × 1.50 mm, M16 × 2.00 mm, M18 × 1.50 mm, M18 × 2.50 mm, M20 × 2.50 mm, M22 × 1.50 mm, M24 × 2.00 mm, M24 × 3.00 mm	5/8", 1", 1 3/16", 1 7/16", 1 13/16"	Plastic Case	Die Wrench (4), Tap Wrench (4), Thread Gauge	0000000	000000
High-Speed Steel
Right-Hand Thread
19	M3 × 0.50 mm, M4 × 0.70 mm, M5 × 0.80 mm, M6 × 1.00 mm, M8 × 1.25 mm, M10 × 1.50 mm, and M12 × 1.75 mm	Plug	Round	M3 × 0.50 mm, M4 × 0.70 mm, M5 × 0.80 mm, M6 × 1.00 mm, M8 × 1.25 mm, M10 × 1.50 mm, M12 × 1.75 mm	__	Metal Case	Die Wrench, Screwdriver, Tap Wrench (2), Thread Gauge	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.

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.

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 x 1.25 mm, M10 × 1.50 mm, M10 x 1.50 mm, M11 × 1.50 mm, M11 x 1.50 mm, M12 × 1.50 mm, M12 x 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, and Z	Plastic Case	Die Wrench (2), Extractor (5), Tap Wrench (3), Thread Gauge (2)	00000000	0000000

Thread Repairing Tap, Die, and File Sets

Repair screw threads in a wide range of sizes. The dies are hex shaped for use with conventional wrenches. The taps have a square shank that's compatible with tap wrenches and tap holders for drill presses and drilling machines. With a plug chamfer, all taps have 3-5 chamfered threads and are suitable for thread repair in both through holes and closed-end holes.

Carbon Steel
Number of Pieces	Tap Sizes Included	Die Sizes Included	File Sizes Included	Container Type		Each
Right-Hand Thread
53	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, 9/16”-12, 9/16"-18,; M6 × 1.00 mm, M8 × 1.25 mm, M10 × 1.25 mm, M10 × 1.50 mm, M12 × 1.25 mm, M12 × 1.50 mm, and M12 × 1.75 mm	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, 9/16"-12, 9/16"-18, 5/8"-11, 5/8"-18, 3/4"-10, 3/4"-16, 3/4"-20, M6 × 1.00 mm, M6 × 1.25 mm, M7 × 1.00 mm, M8 × 1.00 mm, M8 × 1.25 mm, M8 × 1.50 mm, M10 × 1.00 mm, M10 × 1.25 mm, M10 × 1.50 mm, M12 × 1.25 mm, M12 × 1.50 mm, M12 × 1.75 mm, M14 × 1.25 mm, M14 × 1.50 mm, M20 × 1.50 mm	For 11 to 24 threads per inch, For 0.8 to 3 mm thread pitches	Plastic Case	00000000	0000000

Thread Repairing Die Sets

Repair rusted or damaged external threads in a variety of sizes. These dies are hex shaped for use with conventional wrenches.

Plastic Pouch
Number of Pieces	Thread Direction	Die Sizes Included		Each
Carbon Steel
5	Right Hand	M6 × 1.0 mm (11 mm Wd.), M7 × 1.0 mm (14 mm Wd.), M8 × 1.25 mm (14 mm Wd.), M10 × 1.5 mm (18 mm Wd.), M12 × 1.75 mm (19 mm Wd.)	0000000	00000
Plastic Case
Carbon Steel
7	Right Hand	M6 × 1.0 mm (19/32" Wd.), M8 × 1.25 mm (11/16" Wd.), M10 × 1.5 mm (7/8" Wd.), M12 × 1.75 mm (1 1/16" Wd.), M14 × 2.0 mm (1 1/16" Wd.), M16 × 2.0 mm (1 1/4" Wd.), M20 × 2.5 mm (1 5/8" Wd.)	0000000	000000

Thread Repairing Die and File Sets for Tight Spots

Renew external threads in a wide range of sizes. The dies in these sets have a narrower width than standard dies, making them a good choice for thread repair in tight spots. They're hex shaped for use with conventional wrenches.

Carbon Steel
Number of Pieces	Die Sizes Included	File Sizes Included	Container Type		Each
Right-Hand Thread
13	M6 × 1.00 mm (11 mm Wd.), M6 × 1.25 mm (11 mm Wd.), M8 × 1.00 mm (14 mm Wd.), M8 × 1.25 mm (14 mm Wd.), M8 × 1.50 mm (14 mm Wd.), M10 × 1.00 mm (18 mm Wd.), M10 × 1.25 mm (18 mm Wd.), M10 × 1.50 mm (18 mm Wd.), M12 × 1.25 mm (19 mm Wd.), M12 × 1.50 mm (19 mm Wd.), M14 × 1.25 mm (21 mm Wd.), M14 × 1.50 mm (21 mm Wd.)	For 0.8 to 3 mm thread pitches	Plastic Case	0000000	000000

Two-Piece Thread Repairing Die Sets

Clamp these dies around your workpiece, so you can start thread repair anywhere along the length of a bolt, stud, or rod. They're hex shaped for use with conventional wrenches.

Tool Steel
Number of Pieces	Die Sizes Included	Wd.	Container Type		Each
Right-Hand Thread
18	M5-.80 mm, M6-1.0 mm, M8-1.0 mm, M8-1.25 mm, M9-1.0 mm, M9-1.25 mm, M10-1.0 mm, M10-1.25 mm, M10-1.5 mm, M11-1.5 mm, M12-1.25 mm, M12-1.5 mm, M12-1.75 mm, M14-1.25 mm, M14-1.5 mm, M16-2.0 mm, M20-2.5 mm, M24-3.0 mm	1", 1 3/8", 1 3/4"	Plastic Case	0000000	0000000

Thread-Repairing Flange Nuts

Thread Repairing

Combine the utility of a thread-cutting die with a flange nut. These nuts repair damaged threads and cut through rust, residue, and weld spatter as you thread them while the flange distributes pressure on the material surface, eliminating the need for a separate washer. They’re made of Class 10 steel, so they’re about 25% stronger than medium-strength steel flange nuts and comparable in strength to Class 10.9 bolts. These nuts have a zinc-flake coated finish, so they resist corrosion better than nuts with a zinc-plated finish. They’re comparable to Magni-coated nuts.

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

Thread				Flange
Size	Pitch, mm	Wd., mm	Ht., mm	Dia., mm	Thick., mm		Each
Zinc-Flake-Coated Steel—Class 10
M8	1.25	13	8	17.9	1.2	000000000	00000