Aluminum Masking Caps | McMaster-Carr

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37° Flared Tube

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78 Products

Mini Electrical Connector Caps


External Thread with Lanyard	External Thread	Internal Thread with Lanyard	Internal Thread

Protect mini connectors when not in use.

		Thread
	For Face Dia.	Size	Type	Material	Temp. Range, ° F	Includes		Each
External Thread



		0.87"	1 3/8"-16	UNS	Anodized Aluminum	-40 to 190	—	7265N28	000000


		Internal Thread



				0.55"	7/8"-16	UNS	Anodized Aluminum	0 to 220	Lanyard	69005K22	00000


				0.7"	1"-16	UNS	Anodized Aluminum	0 to 220	Lanyard	69005K32	00000
				0.8"	1 1/8"-16	UNS	Anodized Aluminum	0 to 220	Lanyard	69005K42	00000
				0.87"	1 3/8"-16	UNS	Anodized Aluminum	-40 to 190	—	7265N27	00000

Mil. Spec. Screw-Together Electrical Connector Caps

External Thread

Internal Thread

Protect Mil. Spec. connectors when not in use.

	Thread
	Size	Type	Material	Temp. Range, ° F		Each
External Thread



		5/8"-24	UNEF	Cadmium-Plated Aluminum	-65 to 255	8903T81	000000


		7/8"-20	UNEF	Cadmium-Plated Aluminum	-65 to 255	8903T83	00000
		1"-20	UNEF	Cadmium-Plated Aluminum	-65 to 255	8903T85	00000
		1 1/8"-18	UNEF	Cadmium-Plated Aluminum	-65 to 255	8903T87	00000
		1 1/4"-18	UNEF	Cadmium-Plated Aluminum	-65 to 255	8903T89	00000
		1 3/4"-18	UNS	Cadmium-Plated Aluminum	-65 to 255	8903T92	00000


		Internal Thread



				5/8"-24	UNEF	Cadmium-Plated Aluminum	-65 to 255	8903T82	00000


				7/8"-20	UNEF	Cadmium-Plated Aluminum	-65 to 255	8903T84	00000
				1"-20	UNEF	Cadmium-Plated Aluminum	-65 to 255	8903T86	00000
				1 1/8"-18	UNEF	Cadmium-Plated Aluminum	-65 to 255	8903T88	00000
				1 1/4"-18	UNEF	Cadmium-Plated Aluminum	-65 to 255	8903T91	00000
				1 3/4"-18	UNS	Cadmium-Plated Aluminum	-65 to 255	8903T93	00000

Metal Round Caps

Tougher than plastic and rubber caps for best protection from impact and wear. These caps cover pipe ends to prevent damage and keep out dust and debris during shipping and storage.

Aluminum—Use aluminum caps instead of steel to prevent corrosion from spreading to aluminum pipe and tubing.

					Aluminum
For OD	For Pipe Size	Inside Ht.	Flexibility	Max. Temp.		Each
35/64"	1/4	7/16"	Rigid	Not Rated	9275K112	00000
43/64"	3/8	9/16"	Rigid	Not Rated	9275K122	0000
27/32"	1/2	7/16"	Rigid	Not Rated	9275K132	0000
1"	—	23/32"	Rigid	Not Rated	9275K142	0000
1 3/64"	3/4	5/8"	Rigid	Not Rated	9275K152	0000
1 1/4"	—	3/4"	Rigid	Not Rated	9275K162	0000
1 5/16"	1	11/16"	Rigid	Not Rated	9275K172	0000
1 1/2"	—	21/32"	Rigid	Not Rated	9275K182	0000
1 21/32"	1 1/4	13/16"	Rigid	Not Rated	9275K192	0000
1 29/32"	1 1/2	15/16"	Rigid	Not Rated	9275K31	0000
2"	—	1 7/32"	Rigid	Not Rated	9275K212	0000
2 1/4"	—	1 1/16"	Rigid	Not Rated	9275K223	0000
2 3/8"	2	1 1/16"	Rigid	Not Rated	9275K32	0000
2 1/2"	—	1 5/16"	Rigid	Not Rated	9275K232	0000
2 7/8"	2 1/2	1 3/8"	Rigid	Not Rated	9275K33	0000
3"	—	1 1/8"	Rigid	Not Rated	9275K252	0000
3 1/2"	3	1 3/8"	Rigid	Not Rated	9275K34	00000
4"	3 1/2	1 1/2"	Rigid	Not Rated	9275K35	00000
4 1/2"	4	1 7/8"	Rigid	Not Rated	9275K36	00000
5 9/16"	5	1 7/8"	Rigid	Not Rated	9275K272	00000
6 5/8"	6	1 7/8"	Rigid	Not Rated	9275K37	00000

Screw-In Plugs for Pipe and Tubing

Threaded for the most secure fit on female pipe and fittings. These plugs protect from damage during shipping and storage. They also keep dust, paint, and coatings from blocking holes and threads.

For Straight-Thread Fittings

Image of Product. Front orientation. Contains Annotated. Protective Plugs. For Round Shapes, Screw In, For Round Holes, For Pipe, For Straight-Thread Fittings, Aluminum.

Aluminum

Aluminum—Withstand the highest temperatures of all our pipe and tubing plugs. They’re more wear resistant than plastic but won’t hold up as well to chemicals.

	Thread
	Size	Type	For Tube OD	Ht.	Max. Temp., ° F	Pkg. Qty.		Pkg.
Aluminum



		5/16"-24	UNF	5/32"	11/32"	650	25	3438T16	000000


		3/8"-24	UNF	3/16"	9/32"	650	25	3438T17	00000
		7/16"-20	UNF	1/4"	9/32"	650	25	3438T18	0000
		1/2"-20	UNF	5/16"	5/16"	650	25	3438T19	0000
		9/16"-18	UNF	3/8"	5/16"	650	25	3438T21	0000
		5/8"-18	UNF	3/8"	5/16"	650	25	3438T22	0000
		3/4"-16	UNF	1/2"	7/16"	650	25	3438T23	00000
		7/8"-14	UNF	5/8"	1/2"	650	25	3438T24	00000
		1 1/16"-12	UN	3/4"	15/32"	650	25	3438T25	00000
		1 5/16"-12	UN	1"	7/16"	650	25	3438T26	00000
		1 7/8"-12	UN	1 1/2"	5/8"	650	5	3438T27	00000

For 37° Flared Tube

Aluminum

Aluminum—Withstand the highest temperatures of all our pipe and tubing plugs. They’re more wear resistant than plastic but won’t hold up as well to chemicals.

	Thread
	Size	Type	For Tube OD	Ht.	Max. Temp., ° F	Pkg. Qty.		Pkg.
Aluminum



		3/8"-24	UNF	3/16"	3/8"	650	25	3438T33	000000


		7/16"-20	UNF	1/4"	15/32"	650	50	3438T34	00000
		1/2"-20	UNF	5/16"	15/32"	650	50	3438T35	00000
		9/16"-18	UNF	3/8"	1/2"	650	50	3438T36	00000
		5/8"-18	UNF	3/8"	1/2"	650	25	3438T37	00000
		3/4"-16	UNF	1/2"	19/32"	650	50	3438T38	00000
		7/8"-14	UNF	5/8"	11/16"	650	25	3438T39	00000
		1 1/16"-12	UN	3/4"	21/32"	650	25	3438T41	00000
		1 5/16"-12	UN	1"	23/32"	650	10	3438T42	00000
		1 7/8"-12	UN	1 1/2"	7/8"	650	5	3438T43	00000

Metal Square Plugs

Designed to finish off the ends of square metal tubing, these plugs cover rough edges and block dirt and debris. Push into place and then drive with a hammer to secure.

Aluminum—For aluminum tubing, use these plugs instead of steel to avoid rust that spreads when different metals are in contact.

	For Inside			Head
	Lg.	Wd.	Ht.	Lg.	Wd.		Each
Aluminum



		0.77"	0.77"	1/2"	1"	1"	2990N23	000000


		1.02"	1.02"	5/8"	1 1/4"	1 1/4"	2990N22	00000
		1.27"	1.27"	13/16"	1 1/2"	1 1/2"	2990N24	00000
		1.77"	1.77"	3/4"	2"	2"	2990N25	00000

Micro M12 Screw-Together Electrical Connector Caps


For Plugs	For Sockets

Protect M12 connectors when not in use.

	Thread
	Size	Type	Location	Material	Includes	Color	Temp. Range, ° F		Each
For Plugs



		M12 x 1 mm	Metric	Internal	Anodized Aluminum	Lanyard	Black	0 to 220	6897K73	000000


		1/2"-20	UNF	Internal	Anodized Aluminum	Lanyard	—	0 to 220	6897K61	00000


		For Sockets



				M12 x 1 mm	Metric	External	Anodized Aluminum	—	Black	0 to 220	6897K74	00000


				1/2"-20	UNF	External	Anodized Aluminum	—	Gray	0 to 220	6897K62	00000

Screw-On Caps

Aluminum

Thread onto male pipe and fittings for the most secure fit. These caps keep dust, paint, and coatings out of threads and pipe. They also protect from damage during manufacturing, shipping, and storage.

Aluminum—Use aluminum caps instead of steel to prevent corrosion from spreading to aluminum pipe and tubing.

	Thread
	Size	Type	For OD	Inside Ht.	Flexibility	Max. Temp., ° F	Mil. Spec.	Pkg. Qty.		Pkg.
Aluminum







				For Straight-Thread Fittings

				5/16"-24	UNF	5/16"	21/64"	Rigid	650	MIL-C-5501/3	50	3522T11	000000


				3/8"-24	UNF	3/8"	19/64"	Rigid	650	MIL-C-5501/3	50	3522T12	00000
				7/16"-20	UNF	7/16"	15/32"	Rigid	650	MIL-C-5501/3	50	3522T13	0000
				1/2"-20	UNF	1/2"	7/16"	Rigid	650	MIL-C-5501/3	50	3522T14	00000
				9/16"-18	UNF	9/16"	15/32"	Rigid	650	MIL-C-5501/3	50	3522T15	00000
				5/8"-18	UNF	5/8"	33/64"	Rigid	650	MIL-C-5501/3	50	3522T16	00000
				3/4"-16	UNF	3/4"	35/64"	Rigid	650	MIL-C-5501/3	50	3522T17	00000
				7/8"-14	UNF	7/8"	21/32"	Rigid	650	MIL-C-5501/3	50	3522T18	00000
				1 1/16"-12	UN	1 1/16"	49/64"	Rigid	650	MIL-C-5501/3	25	3522T19	00000
				1 5/16"-12	UN	1 5/16"	49/64"	Rigid	650	MIL-C-5501/3	25	3522T21	00000
				1 5/8"-12	UN	1 5/8"	23/32"	Rigid	650	MIL-C-5501/3	10	3522T22	00000