Screw-On Protective Caps

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System of Measurement

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Material

Thread Type

Shape

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For Use With

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Pipe Size

Performance

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Straight-Thread Pipe Fittings

Tapered-Thread Pipe Fittings

Maximum Temperature

Flexibility

REACH

RoHS

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

Yes

DFARS Specialty Metals

Exempt

Export Control Classification Number (ECCN)

EAR99

Certification

Mil. Spec.

Military Specification

MIL-C-5501/3

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40 Products

Performance

Chemical Resistant

Withstand chemical finishing such as plating and anodizing

29 products

High Temperature

Mask parts during paint baking, powder coating, and electroplating

11 products

Performance

High Visibility

Easy to see when installed or if dropped on the floor

29 products

Certification

Mil. Spec.

Manufactured and tested to strict U.S. military standards

11 products

Screw-On Caps

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.

Polyethylene—These tough caps are hard and wear resistant to hold up against scrapes and gouges.

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

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







				For Straight-Thread Fittings

				1/4"-36	UNS	—	1/4"	7/32"	Rigid	150	Red	—	100	1277K111	00000


				3/8"-24	UNF	—	3/8"	15/32"	Rigid	150	Red	—	100	1277K23	0000
				7/16"-20	UNF	—	15/32"	15/32"	Rigid	150	Red	—	100	1277K24	0000
				7/16"-24	UNS	—	7/16"	19/64"	Rigid	150	Red	—	100	1277K112	0000
				1/2"-20	UNF	—	1/2"	15/32"	Rigid	150	Red	—	100	1277K25	00000
				9/16"-18	UNF	—	9/16"	17/32"	Rigid	150	Red	—	100	1277K114	0000
				5/8"-18	UNF	—	5/8"	15/32"	Rigid	150	Red	—	100	1277K115	0000
				5/8"-18	UNF	—	5/8"	13/16"	Rigid	150	Red	—	100	1277K26	00000
				5/8"-24	UNEF	—	5/8"	13/32"	Rigid	150	Red	—	100	1277K116	00000
				3/4"-16	UNF	—	3/4"	9/16"	Rigid	150	Red	—	100	1277K27	00000
				3/4"-18	UNS	—	3/4"	11/16"	Rigid	150	Red	—	100	1277K117	00000


				3/4"-20	UNEF	—	3/4"	1/2"	Rigid	150	Red	—	100	1277K118	00000
				7/8"-14	UNF	—	7/8"	11/16"	Rigid	150	Red	—	100	1277K29	00000
				7/8"-18	UNS	—	7/8"	25/32"	Rigid	150	Red	—	100	1277K119	00000
				7/8"-20	UNEF	—	7/8"	23/32"	Rigid	150	Red	—	100	1277K121	00000
				1"-14	UNS	—	1"	25/32"	Rigid	150	Red	—	100	1277K31	00000
				1 1/16"-12	UN	—	1 1/16"	3/4"	Rigid	150	Red	—	100	1277K32	00000
				1 1/16"-14	UNS	—	1 1/16"	3/4"	Rigid	150	Red	—	100	1277K122	00000
				1 1/8"-18	UNEF	—	1 1/8"	15/32"	Rigid	150	Red	—	100	1277K123	00000
				1 3/16"-12	UN	—	1 3/16"	15/16"	Rigid	150	Red	—	100	1277K124	00000
				1 1/4"-18	UNEF	—	1 1/4"	15/32"	Rigid	150	Red	—	100	1277K125	00000


				1 5/16"-12	UN	—	1 5/16"	7/8"	Rigid	150	Red	—	100	1277K126	00000
				1 3/8"-18	UNEF	—	1 3/8"	15/32"	Rigid	150	Red	—	50	1277K127	00000
				1 1/2"-12	UNF	—	1 1/2"	3/4"	Rigid	150	Red	—	50	1277K128	00000
				1 5/8"-12	UN	—	1 5/8"	29/32"	Rigid	150	Red	—	50	1277K129	00000
				1 3/4"-12	UN	—	1 3/4"	15/16"	Rigid	150	Red	—	25	1277K131	00000
				1 7/8"-12	UN	—	1 7/8"	1"	Rigid	150	Red	—	25	1277K132	00000
				3"-12	UN	—	3"	1 5/32"	Rigid	150	Red	—	10	1277K133	00000




						For Tapered-Thread Fittings

						—	NPT	3/4	1 1/32"	3/4"	Rigid	150	Red	—	100	1277K28	00000


						Aluminum







										For Straight-Thread Fittings

										5/16"-24	UNF	—	5/16"	21/64"	Rigid	650	—	MIL-C-5501/3	50	3522T11	00000


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