Stainless Steel Square-Head Plugs

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304/304L Stainless Steel

316 Stainless Steel

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304 Stainless Steel

304/304L Stainless Steel

316 Stainless Steel

316/316L Stainless Steel

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Male

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

Yes

DFARS Specialty Metals

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127 Products

About Pipe and Fittings

Measure your pipe and fittings to identify their pipe size, thread size, schedule, and thread type. Then, find compatible components.

Low-Pressure Stainless Steel Threaded Pipe Fittings

Use these fittings in a low-pressure pipe line.

External-Square-Drive Plugs

304 Stainless Steel—Fittings hold up in humid, damp, and washdown environments but will corrode if exposed to salt water or chemicals.

316 Stainless Steel—Fittings are the most corrosion resistant. They stand up to wet environments, just like 304 stainless steel fittings, but unlike 304 stainless steel, they will not corrode from salt water, chlorine solutions, and chemicals.

					304 Stainless Steel				316 Stainless Steel
	Pipe Size	Construction	Pressure Class	Body Shape	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.		Each	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.		Each
NPT Male
Male


		1/8	Solid	150	Square	300 psi @ 72° F	150 psi @ 350° F	4464K231	00000	300 psi @ 72° F	150 psi @ 350° F	4452K121	00000


		1/4	Solid	150	Square	300 psi @ 72° F	150 psi @ 350° F	4464K232	0000	300 psi @ 72° F	150 psi @ 350° F	4452K122	0000
		3/8	Solid	150	Square	300 psi @ 72° F	150 psi @ 350° F	4464K233	0000	300 psi @ 72° F	150 psi @ 350° F	4452K123	0000
		1/2	Hollow	150	Square	300 psi @ 72° F	150 psi @ 350° F	4464K234	0000	300 psi @ 72° F	150 psi @ 350° F	4452K124	0000
		3/4	Hollow	150	Square	300 psi @ 72° F	150 psi @ 350° F	4464K235	0000	300 psi @ 72° F	150 psi @ 350° F	4452K125	0000
		1	Hollow	150	Square	300 psi @ 72° F	150 psi @ 350° F	4464K236	0000	300 psi @ 72° F	150 psi @ 350° F	4452K126	0000
		1 1/4	Hollow	150	Square	300 psi @ 72° F	150 psi @ 350° F	4464K237	00000	300 psi @ 72° F	150 psi @ 350° F	4452K127	00000
		1 1/2	Hollow	150	Square	300 psi @ 72° F	150 psi @ 350° F	4464K238	00000	300 psi @ 72° F	150 psi @ 350° F	4452K128	00000
		2	Hollow	150	Square	300 psi @ 72° F	150 psi @ 350° F	4464K239	00000	300 psi @ 72° F	150 psi @ 350° F	4452K129	00000
		2 1/2	Hollow	150	Square	300 psi @ 72° F	150 psi @ 350° F	4464K241	00000	300 psi @ 72° F	150 psi @ 350° F	4452K131	00000
		3	Hollow	150	Square	300 psi @ 72° F	150 psi @ 350° F	4464K242	00000	300 psi @ 72° F	150 psi @ 350° F	4452K132	00000


		4	Hollow	150	Square	300 psi @ 72° F	150 psi @ 350° F	4464K243	00000	300 psi @ 72° F	150 psi @ 350° F	4452K133	000000


		BSPT Male
		Male


				1/8	Solid	150	Square	300 psi @ 72° F	150 psi @ 350° F	4810T181	0000	150 psi @ 72° F	150 psi @ 360° F	5273N255	0000


				1/4	Solid	150	Square	300 psi @ 72° F	150 psi @ 350° F	4810T182	0000	150 psi @ 72° F	150 psi @ 360° F	5273N256	0000
				3/8	Solid	150	Square	300 psi @ 72° F	150 psi @ 350° F	4810T183	0000	150 psi @ 72° F	150 psi @ 360° F	5273N257	0000
				1/2	Hollow	150	Square	300 psi @ 72° F	150 psi @ 350° F	4810T184	0000	150 psi @ 72° F	150 psi @ 360° F	5273N258	00000
				3/4	Hollow	150	Square	300 psi @ 72° F	150 psi @ 350° F	4810T185	00000	150 psi @ 72° F	150 psi @ 360° F	5273N259	00000
				1	Hollow	150	Square	300 psi @ 72° F	150 psi @ 350° F	4810T186	00000	150 psi @ 72° F	150 psi @ 360° F	5273N261	00000
				1 1/4	Hollow	150	Square	300 psi @ 72° F	150 psi @ 350° F	4810T775	00000	150 psi @ 72° F	150 psi @ 360° F	5273N262	00000
				1 1/2	Hollow	150	Square	300 psi @ 72° F	150 psi @ 350° F	4810T188	00000	150 psi @ 72° F	150 psi @ 360° F	5273N263	00000
				2	Hollow	150	Square	300 psi @ 72° F	150 psi @ 350° F	4810T236	00000	150 psi @ 72° F	150 psi @ 360° F	5273N264	00000

Locknuts

NPSL Thread—NPSL (National Pipe Straight Locknut) threads are compatible with NPT threads.

DIN 431—Locknuts that meet DIN 431 comply with international standards for pipe fitting locknut dimensions.

					304 Stainless Steel		316 Stainless Steel
	Pipe Size	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.	Specs. Met		Each		Each
NPSL Female



		1/8	300 psi @ 72° F	150 psi @ 350° F	—	4464K581	00000	4452K671	00000


		1/4	300 psi @ 72° F	150 psi @ 350° F	—	4464K582	0000	4452K672	0000
		3/8	300 psi @ 72° F	150 psi @ 350° F	—	4464K583	00000	4452K673	00000
		1/2	300 psi @ 72° F	150 psi @ 350° F	—	4464K584	00000	4452K674	00000
		3/4	300 psi @ 72° F	150 psi @ 350° F	—	4464K585	00000	4452K675	00000
		1	300 psi @ 72° F	150 psi @ 350° F	—	4464K586	00000	4452K676	00000
		1 1/4	300 psi @ 72° F	150 psi @ 350° F	—	4464K587	00000	4452K677	00000
		1 1/2	300 psi @ 72° F	150 psi @ 350° F	—	4464K588	00000	4452K678	00000
		2	300 psi @ 72° F	150 psi @ 350° F	—	4464K589	00000	4452K679	00000
		2 1/2	300 psi @ 72° F	150 psi @ 350° F	—	4464K591	00000	4452K681	00000
		3	300 psi @ 72° F	150 psi @ 350° F	—	4464K592	00000	4452K682	00000


		4	300 psi @ 72° F	150 psi @ 350° F	—	4464K593	00000	4452K683	00000


		BSPP Female



				1/8	Not Rated	Not Rated	DIN 431	9027N101	0000	———	0


				1/4	Not Rated	Not Rated	DIN 431	9027N102	0000	———	0
				3/8	Not Rated	Not Rated	DIN 431	9027N103	0000	———	0
				1/2	Not Rated	Not Rated	DIN 431	9027N104	0000	———	0
				3/4	Not Rated	Not Rated	DIN 431	9027N106	0000	———	0
				1	Not Rated	Not Rated	DIN 431	9027N107	00000	———	0

High-Pressure Stainless Steel Threaded Pipe Fittings

Use these heavy duty fittings in high-pressure flow applications.

External-Square-Drive Plugs

Male

304 Stainless Steel—Fittings hold up in humid, damp, and washdown environments but will corrode if exposed to salt water or chemicals.

						304 Stainless Steel				316 Stainless Steel
	Pipe Size	Dash Size	Construction	Pressure Class	Body Shape	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.		Each	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.		Each
NPT Male



		1/8	02	Solid	3000	Square	2,500 psi @ 72° F	1,900 psi @ 350° F	4464K321	00000	3,000 psi @ 72° F	2,800 psi @ 350° F	4443K711	00000


		1/4	04	Solid	3000	Square	2,500 psi @ 72° F	1,900 psi @ 350° F	4464K322	0000	3,000 psi @ 72° F	2,800 psi @ 350° F	4443K712	0000
		3/8	06	Solid	3000	Square	2,500 psi @ 72° F	1,900 psi @ 350° F	4464K323	0000	3,000 psi @ 72° F	2,800 psi @ 350° F	4443K713	00000
		1/2	08	Solid	3000	Square	2,500 psi @ 72° F	1,900 psi @ 350° F	4464K324	0000	3,000 psi @ 72° F	2,800 psi @ 350° F	4443K714	00000
		3/4	12	Solid	3000	Square	2,500 psi @ 72° F	1,900 psi @ 350° F	4464K325	00000	3,000 psi @ 72° F	2,800 psi @ 350° F	4443K715	00000
		1	16	Solid	3000	Square	2,500 psi @ 72° F	1,900 psi @ 350° F	4464K326	00000	3,000 psi @ 72° F	2,800 psi @ 350° F	4443K716	00000
		1 1/4	20	Solid	3000	Square	2,500 psi @ 72° F	1,900 psi @ 350° F	4464K327	00000	3,000 psi @ 72° F	2,800 psi @ 350° F	4443K717	00000
		1 1/2	24	Solid	3000	Square	2,500 psi @ 72° F	1,900 psi @ 350° F	4464K328	00000	3,000 psi @ 72° F	2,800 psi @ 350° F	4443K718	00000
		2	32	Solid	3000	Square	2,500 psi @ 72° F	1,900 psi @ 350° F	4464K329	00000	3,000 psi @ 72° F	2,800 psi @ 350° F	4443K719	000000
		2 1/2	40	Solid	3000	Square	—	—	———	0	3,000 psi @ 72° F	2,800 psi @ 350° F	4443K211	000000
		3	48	Solid	3000	Square	2,500 psi @ 72° F	1,900 psi @ 350° F	4464K182	000000	—	—	———	0

Low-Pressure Stainless Steel Threaded Pipe Fittings with Sealant

The male threads on these fittings have a sealant applied for extra leak protection. Also known as Pressure Class 150 fittings, they are built for use in low-pressure applications. They adhere to high-quality standards for heat treating, material thickness, and marking.

External-Square-Drive Plugs

Male

304 Stainless Steel—Fittings hold up in humid, damp, and washdown environments but will corrode if exposed to salt water or chemicals.

							304 Stainless Steel		316 Stainless Steel
	Pipe Size	Construction	Pressure Class	Body Shape	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.		Each		Each
NPT Male



		1/8	Solid	150	Square	300 psi @ 72° F	150 psi @ 360° F	1432N21	00000	1799N21	00000


		1/4	Solid	150	Square	300 psi @ 72° F	150 psi @ 360° F	1432N22	0000	1799N22	0000
		3/8	Solid	150	Square	300 psi @ 72° F	150 psi @ 360° F	1432N23	0000	1799N23	0000
		1/2	Hollow	150	Square	300 psi @ 72° F	150 psi @ 360° F	1432N24	00000	1799N24	00000
		3/4	Hollow	150	Square	300 psi @ 72° F	150 psi @ 360° F	1432N25	00000	1799N25	00000
		1	Hollow	150	Square	300 psi @ 72° F	150 psi @ 360° F	1432N26	00000	1799N26	00000
		1 1/4	Hollow	150	Square	300 psi @ 72° F	150 psi @ 360° F	1432N27	00000	1799N27	00000
		1 1/2	Hollow	150	Square	300 psi @ 72° F	150 psi @ 360° F	1432N28	00000	1799N28	00000
		2	Hollow	150	Square	300 psi @ 72° F	150 psi @ 360° F	1432N29	00000	1799N29	00000

Premium Medium-Pressure Stainless Steel Threaded Pipe Fittings

Unlike other stainless steel fittings, these are cast in the U.S. for superior quality. As another marker of quality, they come with a certificate with a traceable lot number and test report that guarantees material composition. All fittings adhere to ANSI/MSS SP-114 standards for heat treating, material thickness, and marking. It’s the highest quality standard for Pressure Class 1000 medium-pressure stainless steel fittings. These stainless steel fittings are more corrosion resistant than steel fittings, and almost as strong.

Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.

External-Square-Drive Plugs

Male

NPTF Thread—NPTF (Dryseal) threads are compatible with NPT threads.

					316 Stainless Steel
	Pipe Size	Construction	Pressure Class	Body Shape	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.		Each
NPTF Male



		1/2	Solid	1000	Square	1,000 psi @ 72° F	650 psi @ 350° F	5288N29	000000


		3/4	Solid	1000	Square	1,000 psi @ 72° F	650 psi @ 350° F	5288N31	00000
		1	Solid	1000	Square	1,000 psi @ 72° F	650 psi @ 350° F	5288N32	00000
		1 1/4	Solid	1000	Square	1,000 psi @ 72° F	650 psi @ 350° F	5288N33	00000
		1 1/2	Solid	1000	Square	1,000 psi @ 72° F	650 psi @ 350° F	5288N34	00000
		2	Solid	1000	Square	1,000 psi @ 72° F	650 psi @ 350° F	5288N35	00000

Premium Low-Pressure Stainless Steel Threaded Pipe Fittings

Unlike other stainless steel fittings, these are cast in the U.S. for superior quality. As another marker of quality, they come with a certificate with a traceable lot number and test report that guarantees material composition. All fittings except plugs adhere to ANSI/MSS SP-114 standards for heat treating, material thickness, and marking. It’s the highest quality standard for Pressure Class 150 low-pressure stainless steel fittings. They also meet either ASTM A351 or A479 requirements for parts that will be used in pressure systems. These stainless steel fittings are more corrosion resistant than steel fittings, and almost as strong.

Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.

External-Square-Drive Plugs

Male

NPTF Thread—NPTF (Dryseal) threads are compatible with NPT threads.

					316 Stainless Steel
	Pipe Size	Construction	Pressure Class	Body Shape	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.		Each
NPTF Male



		1/4	Solid	150	Square	270 psi @ 72° F	150 psi @ 350° F	5288N27	00000


		3/8	Solid	150	Square	270 psi @ 72° F	150 psi @ 350° F	5288N28	0000

Drain Valves for Thick Liquids

Empty mud, sludge, and water from tanks, reservoirs, and basins. First designed for use on settling tanks in water treatment plants, these stainless steel drain valves won't corrode from washdowns and long-term exposure to waste. They install flush with the bottom of large vessels. Lift them up for drainage using a valve wrench or position indicator.

				Bolt					Overall
	Pipe Size	Pressure Class	Flange OD	Circle Dia.	No. of Holes	Hole Dia.	Included	Temp. Range, ° F	Wd.	Ht.	Stem Type	Drive Style	Drive Size	Valve Type	For Use With		Each
316 Stainless Steel Body and Disc



		4	125	9"	7 1/2"	8	3/4"	No	35 to 125	9 5/16"	15 1/4"	Nonrising	External Square	2"	Globe	Water, Thick Liquids	8308N11	000000000


		6	125	11"	9 1/2"	8	7/8"	No	35 to 125	11 3/16"	15 1/4"	Nonrising	External Square	2"	Globe	Water, Thick Liquids	8308N12	00000000
		8	125	13 1/4"	11 3/4"	8	7/8"	No	35 to 125	13 5/8"	20 1/4"	Nonrising	External Square	2"	Globe	Water, Thick Liquids	8308N13	00000000
		10	125	16"	14 1/4"	12	1"	No	35 to 125	16 1/2"	23 7/8"	Nonrising	External Square	2"	Globe	Water, Thick Liquids	8308N14	00000000
		12	125	18 3/4"	17"	12	1"	No	35 to 125	19 1/4"	25 3/4"	Nonrising	External Square	2"	Globe	Water, Thick Liquids	8308N15	00000000

Sealing Screws for Wood and Composite Wood

Prevent rot in roofs, decks, and outdoor posts. The rubber-backed washer in these screws keeps fluid out of fastened joints. They're made of stainless steel, so they won't degrade from chemically treated wood, such as ACQ-treated (arsenic-free) lumber. Also known as trim head screws, they exert less pressure on surfaces to curb splitting and distortion. The square drive handles more torque than slotted and Phillips drives, so it's less likely to slip.

The screw drill tip acts as a built-in pilot, though pilot holes are still recommended near edges to avoid splitting. Length is measured from the top of the head.

18-8 Stainless Steel—The choice for wet and outdoor environments, these screws resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

		Head						Washer
	Lg.	Dia.	Ht.	Drill Bit Size	Flat Head Profile	Approx. Threads per In.	Threading	OD	Thk.	Tapping Method	Tapping Screw Type	Pkg. Qty.		Pkg.
18-8 Stainless Steel with Stainless Steel and Rubber Washer







				No. 7

				1"	0.23"	0.125"	1/16"	Standard	16	Partially Threaded	0.63"	0.2"	Thread Cutting	17	25	91540A100	000000


				1 5/8"	0.23"	0.125"	1/16"	Standard	16	Partially Threaded	0.63"	0.2"	Thread Cutting	17	25	91540A200	00000
				2 1/4"	0.23"	0.125"	1/16"	Standard	16	Partially Threaded	0.63"	0.2"	Thread Cutting	17	10	91540A300	00000
				3"	0.23"	0.125"	1/16"	Standard	16	Partially Threaded	0.63"	0.2"	Thread Cutting	17	10	91540A400	00000