Electrical Dies | McMaster-Carr

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64 Products

Pipe and Conduit Dies

Add threads to pipe and conduit when installing new runs or altering an existing system. A cut above lower-quality dies that can leave inferior threads, these are machined in the U.S. to precise dimensions for accuracy and consistency. They are adjustable, so you can create a shallow thread that makes it easier to get the die started on the first pass. Turn the set screw to open the die to its largest diameter. Then rotate the die with a round die wrench and adjust the screw as you make additional passes to reach the proper thread size.

Uncoated Carbon Steel—Our most economical dies, these are good for jobs that pop up. They work on most metal and plastic but will dull faster than high-speed steel dies.

Uncoated High-Speed Steel—The most versatile dies stay sharp and cut cleanly, even if you use them every day. They last much longer than carbon steel dies and you won’t have to work as hard to create threads.

	Dies						Die Wrenches
			Uncoated Carbon Steel		Uncoated High-Speed Steel
	Pipe Size	Threads per In.		Each		Each		Each
NPT Thread







				1" OD

				1/16	27	———	0	2556A111	000000	25565A21	00000


				1/8	27	———	0	2556A112	00000	25565A21	0000
				1/4	18	———	0	2556A113	00000	25565A21	0000




						1 1/2" OD

						1/16	27	———	0	2556A121	00000	25565A22	00000


						1/8	27	2685A111	000000	2556A122	00000	25565A22	00000
						1/4	18	2685A112	00000	2556A123	00000	25565A22	00000
						3/8	18	2685A12	00000	2556A124	00000	25565A22	00000
						1/2	14	2685A13	00000	2556A125	00000	25565A22	00000




								2" OD

								1/4	18	———	0	2556A131	00000	25565A25	00000


								3/8	18	———	0	2556A132	00000	25565A25	00000
								1/2	14	———	0	2556A133	000000	25565A25	00000
								3/4	14	2685A15	00000	2556A134	000000	25565A25	00000




										2 1/2" OD

										1	11 1/2	———	0	2556A144	000000	25565A26	00000




												3" OD

												1 1/4	11 1/2	———	0	2556A154	000000	25565A27	00000


												BSPT Thread







																1" OD

1/8	28															———	0	8287A21	00000	25565A21	0000


1/4	19															———	0	8287A22	00000	25565A21	0000




		1 1/2" OD

		3/8	19													———	0	8287A23	00000	25565A22	00000


		1/2	14													———	0	8287A24	000000	25565A22	00000




				2" OD

				3/4	14											———	0	8287A25	000000	25565A25	00000




																2 1/2" OD

																1	11	———	0	8287A26	000000	25565A26	00000




																3" OD

																1 1/4	11	———	0	8287A27	000000	25565A27	00000


																BSPP Thread







																		1" OD

																		1/8	28	———	0	8287A11	00000	25565A21	0000


										1/4	19							———	0	8287A12	00000	25565A21	0000




																		1 1/2" OD

												3/8						19	———	0	8287A13	00000	25565A22	00000


												1/2	14					———	0	8287A14	000000	25565A22	00000




														2" OD

														3/4	14			———	0	8287A15	000000	25565A25	00000




														2 1/2" OD

														1	11			———	0	8287A16	000000	25565A26	00000




																		3" OD

		1 1/4	11															———	0	8287A17	000000	25565A27	00000

Pipe and Conduit Thread-Repairing Dies

Fix damage and clean up rust on the threaded ends of pipe and conduit so they fit together without leaking. Don’t risk damaging threads further with an inferior quality die. Our dies are machined in the U.S. to precise dimensions for a perfect thread profile. Turn them with a hex die wrench or a standard adjustable wrench.

Uncoated Carbon Steel—Hard and wear resistant for a long life, these dies work well on both metal and plastic.

				Uncoated Carbon Steel
	Pipe Size	Threads per In.	Wd.		Each
NPT Thread



		1/16	27	11/16"	2573A49	000000


		1/8	27	1 1/16"	2573A61	00000
		1/4	18	1 1/4"	2573A62	00000
		3/8	18	1 7/16"	2573A63	00000
		1/2	14	1 5/8"	2573A64	00000
		3/4	14	2"	2573A65	000000
		1	11 1/2	2 3/8"	2573A66	000000
		1 1/4	11 1/2	3 1/8"	2573A92	000000
		1 1/2	11 1/2	3 1/2"	2573A93	000000
		2	11 1/2	4 1/2"	2573A94	000000
		2 1/2	8	5"	2573A95	000000


		3	8	5"	2573A96	000000


		BSPT Thread



				1/8	28	7/8"	8285A21	00000


				1/4	19	1 1/16"	8285A22	00000
				3/8	19	1 7/16"	8285A23	00000
				1/2	14	1 5/8"	8285A24	00000
				3/4	14	2"	8285A25	00000
				1	11	2 3/8"	8285A26	000000
				1 1/4	11	3 1/4"	8285A27	000000


				BSPP Thread



						1/8	28	7/8"	8285A11	00000


						1/4	19	1 1/16"	8285A12	00000
						3/8	19	1 7/16"	8285A13	00000
						1/2	14	1 5/8"	8285A14	00000
						3/4	14	2"	8285A15	00000
						1	11	2 3/8"	8285A16	000000
						1 1/4	11	3 1/4"	8285A17	000000