Aluminum Thread Protector Caps

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Material

Aluminum

2011 Aluminum

Aluminum

System of Measurement

Thread Size

Attachment Type

Shape

Pipe Size

Thread Type

Inside Height

For Use With

Profile Shape

Performance

Maximum Temperature

Compatible Connection

37° Flared Tube

Straight-Thread Pipe Fittings

Unthreaded Pipe Fittings

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

RoHS

Compliant

Compliant with Exemptions

REACH

Compliant

Not Compliant

Export Control Classification Number (ECCN)

EAR99

DFARS Specialty Metals

Tube OD

Height

Flexibility

Cap Type

Certification

Nut Type

Drive Style

64 Products

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

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. Screw In, For Round Holes, For Pipe, For Round Shapes, 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

Cap Nuts

Conceal and protect protruding screw threads while fastening parts together. These nuts help prevent damage to surrounding materials and reduce injuries. Also known as acorn nuts, they have a smooth, rounded head that creates a finished look.

Lightweight Aluminum

2011 Aluminum—One-third the weight of steel, these nuts are commonly used in robotics, automation, and other applications that have weight limitations. They're an alternative to stainless steel for rust resistance but are not as strong.

							Pkg.
	Thread Size	Thread Dp.	Wd.	Ht.	Pkg. Qty.		1-9	10-49	50-Up
2011 Aluminum



		6-32	3/16"	5/16"	19/64"	10	91884A213	000000	000000	000000


		10-24	5/32"	3/8"	11/32"	25	91884A216	00000	00000	0000
		10-32	5/32"	3/8"	11/32"	25	91884A219	00000	00000	0000
		1/4"-20	5/32"	7/16"	3/8"	25	91884A224	00000	0000	0000
		5/16"-18	7/32"	9/16"	7/16"	10	91884A227	0000	0000	0000
		3/8"-16	1/4"	5/8"	1/2"	10	91884A235	00000	00000	0000

Fully-Threaded Standoff Caps

Give open-ended standoffs a finished look and protect them from dirt and debris.

Aluminum—Aluminum caps have good corrosion resistance, are lightweight, and are nonmagnetic.

Choose a Thread Size		Each







For 1/4" Standoff OD

Aluminum	1/4"	3/8"	4-40, 6-32, 8-32, 10-32	93558A715	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