Class 1500 Pipe Flanges | McMaster-Carr

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3,700 psi @ 72° F

Not Rated

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38 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.

Extreme-Pressure Iron and Steel Threaded Pipe Flanges

Also known as Pressure Class 1500 flanges, these have the strength to handle high pressures. Bolt two same-size flanges together with a gasket (sold separately) to create an access point within a line. Flanges are for use in noncorrosive environments.

Forged Flanges


Front	Raised Surface on Back

Forged flanges have better strength than cast flanges.

	Pipe Size		Dash Size					Bolt Hole
	(A)	(B)	(A)	(B)	Flanged Connection Surface (B)	Flange OD	For Bolt Dia.	Dia.	No. Of	Bolt Circle Dia.	Pressure Class	Material	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.		Each
NPT Female



		1/2	1/2	08	08	Raised	4 3/4"	3/4"	7/8"	4	3 1/4"	1500	Steel	3,700 psi @ 72° F	3,200 psi @ 300° F	1153T41	0000000


		3/4	3/4	12	12	Raised	5 1/8"	3/4"	7/8"	4	3 1/2"	1500	Steel	3,700 psi @ 72° F	3,200 psi @ 300° F	1153T42	000000
		1	1	16	16	Raised	5 7/8"	7/8"	1"	4	4"	1500	Steel	3,700 psi @ 72° F	3,200 psi @ 300° F	1153T43	000000
		1 1/4	1 1/4	20	20	Raised	6 1/4"	7/8"	1"	4	4 3/8"	1500	Steel	3,700 psi @ 72° F	3,200 psi @ 300° F	1153T44	000000
		1 1/2	1 1/2	24	24	Raised	7"	1"	1 1/8"	4	4 7/8"	1500	Steel	3,700 psi @ 72° F	3,200 psi @ 300° F	1153T45	000000
		2	2	32	32	Raised	8 1/2"	7/8"	1"	8	6 1/2"	1500	Steel	3,700 psi @ 72° F	3,200 psi @ 300° F	1153T46	000000
		3	3	48	48	Raised	10 1/2"	1 1/4"	1 1/4"	8	8"	1500	Steel	Not Rated	Not Rated	1153T47	000000
		4	4	64	64	Raised	12 1/4"	1.38"	1.38"	8	9 1/2"	1500	Steel	Not Rated	Not Rated	1153T48	000000

Extreme-Pressure Iron and Steel Unthreaded Pipe Flanges

For excellent strength in extreme-pressure applications, choose these heavy duty Pressure Class 1500 flanges. Bolt two same-size flanges together with a gasket (sold separately) to create an access point in a pipe line. They are for noncorrosive environments.

Forged Flanges


Butt Weld: Front	Butt Weld: Raised Surface on Back	Slip-On Weld Female: Front

Slip-On Weld Female: Raised Surface on Back	Socket-Connect Female: Front	Socket-Connect Female: Raised Surface on Back

Forged flanges have better strength than cast flanges.

Butt-Weld Fitting Connection—Butt-weld flanges are also known as weld-neck flanges; the flange neck has a beveled end that, when flush to pipe, creates a trough for a strong weld.

Slip-on-Weld Fitting Connection—Slip-on weld flanges have no internal stop; slide a pipe through the flange and weld on both sides.

	Pipe Size		Dash Size					Bolt Hole
	(A)	(B)	(A)	(B)	Flanged Connection Surface (B)	Flange OD	For Bolt Dia.	Dia.	No. Of	Bolt Circle Dia.	Pressure Class	Material	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.		Each
Butt Weld



		1	1	16	16	Raised	5 7/8"	7/8"	1"	4	4"	1500	Steel	3,700 psi @ 72° F	3,200 psi @ 300° F	1139T41	0000000


		1 1/2	1 1/2	24	24	Raised	7"	1"	1 1/8"	4	4 7/8"	1500	Steel	3,700 psi @ 72° F	3,200 psi @ 300° F	1139T43	000000
		2	2	32	32	Raised	8 1/2"	7/8"	1"	8	6 1/2"	1500	Steel	3,700 psi @ 72° F	3,200 psi @ 300° F	1139T44	000000
		3	3	48	48	Raised	10 1/2"	1 1/4"	1 1/4"	8	8"	1500	Steel	3,700 psi @ 72° F	3,200 psi @ 300° F	1139T69	000000


		Slip-On Weld Female



				1	1	16	16	Raised	5 7/8"	7/8"	1"	4	4"	1500	Steel	3,700 psi @ 72° F	3,200 psi @ 300° F	1139T47	000000


				2	2	32	32	Raised	8 1/2"	7/8"	1"	8	6 1/2"	1500	Steel	3,700 psi @ 72° F	3,200 psi @ 300° F	1139T51	000000


				Socket-Connect Female



						3/4	3/4	12	12	Raised	5 1/8"	3/4"	7/8"	4	3 1/2"	1500	Steel	3,700 psi @ 72° F	3,200 psi @ 300° F	1139T59	000000


						1	1	16	16	Raised	5 7/8"	7/8"	1"	4	4"	1500	Steel	3,700 psi @ 72° F	3,200 psi @ 300° F	1139T61	000000
						1 1/2	1 1/2	24	24	Raised	7"	1"	1 1/8"	4	4 7/8"	1500	Steel	3,700 psi @ 72° F	3,200 psi @ 300° F	1139T63	000000
						2	2	32	32	Raised	8 1/2"	7/8"	1"	8	6 1/2"	1500	Steel	3,700 psi @ 72° F	3,200 psi @ 300° F	1139T64	000000

Forged Blind Flanges


Front	Raised Surface on Back

Forged flanges have better strength than cast flanges.

						Bolt Hole
	Pipe Size	Dash Size	Flanged Connection Surface	Flange OD	For Bolt Dia.	Dia.	No. Of	Bolt Circle Dia.	Pressure Class	Material	Max. Pressure @ Temp.	Max. Steam Pressure @ Temp.		Each
Flanged



		1/2	08	Raised	4 3/4"	3/4"	7/8"	4	3 1/4"	1500	Steel	3,700 psi @ 72° F	3,200 psi @ 300° F	1139T52	0000000


		3/4	12	Raised	5 1/8"	3/4"	7/8"	4	3 1/2"	1500	Steel	3,700 psi @ 72° F	3,200 psi @ 300° F	1139T53	000000
		1	16	Raised	5 7/8"	7/8"	1"	4	4"	1500	Steel	3,700 psi @ 72° F	3,200 psi @ 300° F	1139T54	000000
		1 1/4	20	Raised	6 1/4"	7/8"	1"	4	4 3/8"	1500	Steel	3,700 psi @ 72° F	3,200 psi @ 300° F	1139T55	000000
		1 1/2	24	Raised	7"	1"	1 1/8"	4	4 7/8"	1500	Steel	3,700 psi @ 72° F	3,200 psi @ 300° F	1139T56	000000
		2	32	Raised	8 1/2"	7/8"	1"	8	6 1/2"	1500	Steel	3,700 psi @ 72° F	3,200 psi @ 300° F	1139T57	000000
		3	48	Raised	10 1/2"	1 1/4"	1 1/4"	8	8"	1500	Steel	3,700 psi @ 72° F	3,200 psi @ 300° F	1139T72	000000
		4	64	Raised	12 1/4"	1.38"	1.38"	8	9 1/2"	1500	Steel	3,700 psi @ 72° F	3,200 psi @ 300° F	1139T73	000000

Threaded Rod and Hex Nut Kits for Pipe Flanges

These kits include the rods and nuts you need to connect standard-size pipe flanges. Their heavy duty material and construction keep tanks, valves, and flanges tightly sealed under heavy pressure. With a 10% wider profile than standard hex nuts, these hex nuts spread force over a larger area and can handle extra torque during installation. The rods are fully threaded to distribute and absorb high levels of clamping force. To ensure your pipe flange connection is tight, add a pipe flange gasket to your installation. These rods and nuts meet a number of rigorous industry specifications for high-pressure performance, high-temperature performance, and dimensional requirements.

Medium-Strength Steel

Image of Product. Front orientation. Threaded Rods. Threaded Rod and Hex Nut Kits for Pipe Flanges, Steel.

With a tensile strength of 125,000 psi, these rods are strong enough for most industrial applications, such as anchoring machinery and connecting pipe flanges. They are about twice as strong as low-strength steel rods.

Steel—Best for dry environments since moisture will cause these rods to rust.

Corrosion-Resistant PTFE-Coated Steel—A PTFE coating protects the steel from corrosion and pitting when exposed to chemicals, such as those found in cleaners and sanitizers. The coating is also slippery to thread on smoothly.

		Threaded Rod				Hex Nut									Steel		Corrosion-Resistant PTFE-Coated Steel
	For Pipe Size	Thread Size	Lg.	Tensile Strength, psi	Specs. Met	Thread Size	Wd.	Ht.	Hex Nut Profile	Specs. Met	Hardness	Fastener Strength Grade/Class	No. of Threaded Rods Included	No. of Nuts Included		Each	Color		Each
For Flange Class 1500



		1/2	3/4"-10	4 1/4"	125,000	ASTM A193	3/4"-10	1 1/4"	47/64"	Heavy	ASTM A194	Rockwell C35	ASTM Grade B7	4	8	94628A221	000000	Blue	95064A221	000000


		3/4	3/4"-10	4 1/2"	125,000	ASTM A193	3/4"-10	1 1/4"	47/64"	Heavy	ASTM A194	Rockwell C35	ASTM Grade B7	4	8	94628A222	00000	Blue	95064A222	00000
		1	7/8"-9	5"	125,000	ASTM A193	7/8"-9	1 7/16"	55/64"	Heavy	ASTM A194	Rockwell C35	ASTM Grade B7	4	8	94628A231	00000	Blue	95064A231	00000
		1 1/2	1"-8	5 1/2"	125,000	ASTM A193	1"-8	1 5/8"	63/64"	Heavy	ASTM A194	Rockwell C35	ASTM Grade B7	4	8	94628A241	00000	Blue	95064A241	00000
		2	7/8"-9	5 3/4"	125,000	ASTM A193	7/8"-9	1 7/16"	55/64"	Heavy	ASTM A194	Rockwell C35	ASTM Grade B7	8	16	94628A232	00000	Blue	95064A232	00000
		3	1 1/8"-8	7"	125,000	ASTM A193	1 1/8"-8	1 13/16"	1 7/64"	Heavy	ASTM A194	Rockwell C35	ASTM Grade B7	8	16	———	0	Blue	95064A251	000000
		4	1 1/4"-8	7 3/4"	125,000	ASTM A193	1 1/4"-8	2"	1 7/32"	Heavy	ASTM A194	Rockwell C35	ASTM Grade B7	8	16	———	0	Blue	95064A261	000000