Stainless Steel Blind Pipe Flanges

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	Material Material

304 Stainless Steel

316 Stainless Steel

	For Pipe Material For Pipe Material

304/304L Stainless Steel

304 Stainless Steel

316/316L Stainless Steel

316 Stainless Steel

	Pipe Size Pipe Size

1/2
3/4
1
1 1/4
1 1/2
2
2 1/2
3
4
6
8
10
12

	Pressure Class Pressure Class

150

300

600

	Type Type


Cap	Flange

	Flange OD Flange OD

	Flanged Connection Surface Flanged Connection Surface


Raised	Flat

O-Ring Groove

	Number of Bolt Holes Number of Bolt Holes

	For Pipe Schedule For Pipe Schedule

	40

	Bolt Circle Diameter Bolt Circle Diameter

	Specifications Met Specifications Met

	For Use With For Use With

	Maximum Pressure Maximum Pressure

	Connection Type Connection Type


Pipe	Tube

	Fabrication Fabrication

Forged

Cast

Machined

	Bolt Hole Diameter Bolt Hole Diameter

	For Bolt Diameter For Bolt Diameter

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

	Weight Weight

	Maximum Steam Pressure Maximum Steam Pressure

	Dash Size Dash Size

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How to Identify and Measure Fittings

Pipe size is an industry designation, not the actual size. View information about how to measure threaded and unthreaded pipe and pipe fittings.

Low-Pressure Stainless Steel Unthreaded Pipe Flanges

Bolt two flat-surface flanges or two raised-surface flanges of the same size together with a gasket (sold separately) to create an access point in a pipe line.

304 stainless steel flanges offer very good corrosion resistance, and 316 stainless steel flanges have excellent corrosion resistance.

Forged flanges have better strength than cast flanges. Cast flanges are also called MSS flanges. Cap flanges are also known as blind flanges.

For technical drawings and 3-D models, click on a part number.

Inch Caps—Forged

Front

Raised Surface on Back

For Use With: Air, Water, Oil, Natural Gas
Pressure Class: 150
Specifications Met: ASTM A182, ASME B16.5
Certification: Material Certificate with Traceable Lot Number and Test Report
Fittings: Use schedule 40 stainless steel
Pipe Nipples and Pipe: Use Schedule 40 stainless steel

			Bolt Hole				304/304L Stainless Steel		316/316L Stainless Steel
Pipe Size	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Max. Pressure		Each		Each
1/2	3 1/2"	1/2"	5/8"	4	2 3/8"	230 psi @ 72° F	000000000	000000	000000000	000000
3/4	3 7/8"	1/2"	5/8"	4	2 3/4"	230 psi @ 72° F	000000000	00000	000000000	00000
1	4 1/4"	1/2"	5/8"	4	3 1/8"	230 psi @ 72° F	000000000	00000	000000000	00000
1 1/4	4 5/8"	1/2"	5/8"	4	3 1/2"	230 psi @ 72° F	000000000	00000	000000000	00000
1 1/2	5"	1/2"	5/8"	4	3 7/8"	230 psi @ 72° F	000000000	00000	000000000	00000
2	6"	5/8"	3/4"	4	4 3/4"	230 psi @ 72° F	000000000	00000	000000000	000000
2 1/2	7"	5/8"	3/4"	4	5 1/2"	230 psi @ 72° F	000000000	000000	000000000	000000
3	7 1/2"	5/8"	3/4"	4	6"	230 psi @ 72° F	000000000	000000	000000000	000000
4	9"	5/8"	3/4"	8	7 1/2"	230 psi @ 72° F	000000000	000000	000000000	000000
6	11"	3/4"	7/8"	8	9 1/2"	230 psi @ 72° F	000000000	000000	000000000	000000
8	13 1/2"	3/4"	7/8"	8	11 3/4"	230 psi @ 72° F	000000000	000000	000000000	000000
10	16"	7/8"	1"	12	14 1/4"	230 psi @ 72° F	000000000	000000	000000000	000000
12	19"	7/8"	1"	12	17"	230 psi @ 72° F	000000000	000000	000000000	000000

Metric Caps—Forged

Front

Raised Surface on Back

For Use With: Air, Natural Gas, Oil, Steam, Water
Specifications Met: DIN EN 1092-1
Fittings: Use schedule 40 stainless steel
Pipe Nipples and Pipe: Use Schedule 40 stainless steel

				Bolt Hole
Pipe Size	DN Flange Size	Flange OD, mm	For Bolt Dia., mm	Dia., mm	No. of	Bolt Circle Dia., mm	Max. Pressure	Max. Steam Pressure		Each
304/304L Stainless Steel
1	25	115	12	14	4	85	230 psi @ 72° F	125 psi @ 300° F	0000000	0000000
2	50	165	16	18	4	125	230 psi @ 72° F	125 psi @ 300° F	0000000	000000
3	80	200	16	18	8	160	230 psi @ 72° F	125 psi @ 300° F	0000000	000000
4	100	220	16	18	8	180	230 psi @ 72° F	125 psi @ 300° F	0000000	000000
6	150	285	20	22	8	240	230 psi @ 72° F	125 psi @ 300° F	0000000	000000
316/316L Stainless Steel
1	25	115	12	14	4	85	230 psi @ 72° F	145 psi @ 300° F	0000000	000000
2	50	165	16	18	4	125	230 psi @ 72° F	145 psi @ 300° F	0000000	000000
3	80	200	16	18	8	160	230 psi @ 72° F	145 psi @ 300° F	0000000	000000
4	100	220	16	18	8	180	230 psi @ 72° F	145 psi @ 300° F	0000000	000000
6	150	285	20	22	8	240	230 psi @ 72° F	145 psi @ 300° F	0000000	000000

Caps—Cast

Front

Flat Surface on Back

For Use With: Air, Water, Natural Gas, Oil
Pressure Class: 150
Specifications Met: MSS SP-42, ASTM A341
Fittings: Use schedule 40 stainless steel
Pipe Nipples and Pipe: Use Schedule 40 stainless steel

			Bolt Hole				304 Stainless Steel		316 Stainless Steel
Pipe Size	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Max. Pressure		Each		Each
1/2	3 1/2"	1/2"	5/8"	4	2 3/8"	230 psi @ 72° F	000000000	000000	000000000	000000
3/4	3 7/8"	1/2"	5/8"	4	2 3/4"	230 psi @ 72° F	000000000	00000	000000000	00000
1	4 1/4"	1/2"	5/8"	4	3 1/8"	230 psi @ 72° F	000000000	00000	000000000	00000
1 1/4	4 5/8"	1/2"	5/8"	4	3 1/2"	230 psi @ 72° F	000000000	00000	000000000	00000
1 1/2	5"	1/2"	5/8"	4	3 7/8"	230 psi @ 72° F	000000000	00000	000000000	00000
2	6"	5/8"	3/4"	4	4 3/4"	230 psi @ 72° F	000000000	000000	000000000	000000
2 1/2	7"	5/8"	3/4"	4	5 1/2"	230 psi @ 72° F	000000000	000000	000000000	000000
3	7 1/2"	5/8"	3/4"	4	6"	230 psi @ 72° F	000000000	000000	000000000	000000

High-Pressure Stainless Steel Unthreaded Pipe Flanges

Use these heavy duty forged flanges for high-pressure applications. Bolt two flat-surface flanges or two raised-surface flanges of same size together with a gasket (sold separately) to create an access point in a pipe line.

304 stainless steel flanges offer very good corrosion resistance. 316 stainless steel flanges have excellent corrosion resistance. Cap flanges are also known as blind flanges.

For technical drawings and 3-D models, click on a part number.

Caps

Front

Raised Surface on Back

For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
Pressure Class: See table
Specifications Met:
Pressure Class 300: ASME B16.5, ASTM A182, MSS SP-25, MSS SP-6
Pressure Class 600: ASME B16.5, ASTM A182
Certification: Material Certificate with Traceable Lot Number and Test Report
Pipe Nipples and Pipe: Use Schedule 40 stainless steel
Fittings: Use Schedule 40 stainless steel

						Bolt Hole
Pipe Size	Dash Size	Max. Pressure	Max. Steam Pressure	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.		Each
304/304L Stainless Steel
Pressure Class 300
1/2	08	600 psi @ 72° F	300 psi @ 360° F	3 3/4"	1/2"	0.625"	4	2 5/8"	00000000	000000
3/4	12	600 psi @ 72° F	300 psi @ 360° F	4 5/8"	5/8"	0.75"	4	3 1/4"	00000000	00000
1	16	600 psi @ 72° F	300 psi @ 360° F	4 7/8"	5/8"	0.75"	4	3 1/2"	00000000	00000
1 1/4	20	600 psi @ 72° F	300 psi @ 360° F	5 1/4"	5/8"	0.75"	4	3 7/8"	00000000	000000
1 1/2	24	600 psi @ 72° F	300 psi @ 360° F	6 1/8"	3/4"	0.875"	4	4 1/2"	00000000	000000
2	32	600 psi @ 72° F	300 psi @ 360° F	6 1/2"	5/8"	0.75"	8	5"	00000000	000000
2 1/2	40	600 psi @ 72° F	300 psi @ 360° F	7 1/2"	3/4"	0.875"	8	5 7/8"	00000000	000000
3	48	600 psi @ 72° F	300 psi @ 360° F	8 1/4"	3/4"	0.875"	8	6 5/8"	00000000	000000
4	64	600 psi @ 72° F	300 psi @ 360° F	10"	3/4"	0.875"	8	7 7/8"	00000000	000000
6	96	600 psi @ 72° F	300 psi @ 360° F	12 1/2"	3/4"	0.875"	12	10 5/8"	00000000	000000
8	__	600 psi @ 72° F	300 psi @ 360° F	15"	7/8"	1"	12	13"	0000000	000000
10	__	600 psi @ 72° F	300 psi @ 360° F	17 1/2"	1"	1.12"	16	15 1/4"	0000000	000000
Pressure Class 600
1/2	08	1,200 psi @ 72° F	840 psi @ 400° F	3 3/4"	1/2"	0.62"	4	2 5/8"	0000000	00000
3/4	12	1,200 psi @ 72° F	840 psi @ 400° F	4 5/8"	5/8"	0.75"	4	3 1/4"	0000000	00000
1	16	1,200 psi @ 72° F	840 psi @ 400° F	4 7/8"	5/8"	0.75"	4	3 1/2"	0000000	000000
1 1/4	20	1,200 psi @ 72° F	840 psi @ 400° F	5 1/4"	5/8"	0.75"	4	3 7/8"	0000000	000000
1 1/2	24	1,200 psi @ 72° F	840 psi @ 400° F	6 1/8"	3/4"	0.875"	4	4 1/2"	0000000	000000
2	32	1,200 psi @ 72° F	840 psi @ 400° F	6 1/2"	5/8"	0.75"	8	5"	0000000	000000
2 1/2	40	1,200 psi @ 72° F	840 psi @ 400° F	7 1/2"	3/4"	0.88"	8	5 7/8"	0000000	000000
3	48	1,200 psi @ 72° F	840 psi @ 400° F	8 1/4"	3/4"	0.88"	8	6 5/8"	0000000	000000
4	64	1,200 psi @ 72° F	840 psi @ 400° F	10 3/4"	7/8"	1"	8	8 1/2"	0000000	000000
316/316L Stainless Steel
Pressure Class 300
1/2	08	600 psi @ 72° F	300 psi @ 360° F	3 3/4"	1/2"	0.625"	4	2 5/8"	00000000	00000
3/4	12	600 psi @ 72° F	300 psi @ 360° F	4 5/8"	5/8"	0.75"	4	3 1/4"	00000000	00000
1	16	600 psi @ 72° F	300 psi @ 360° F	4 7/8"	5/8"	0.75"	4	3 1/2"	00000000	00000
1 1/4	20	600 psi @ 72° F	300 psi @ 360° F	5 1/4"	5/8"	0.75"	4	3 7/8"	00000000	000000
1 1/2	24	600 psi @ 72° F	300 psi @ 360° F	6 1/8"	3/4"	0.875"	4	4 1/2"	00000000	000000
2	32	600 psi @ 72° F	300 psi @ 360° F	6 1/2"	5/8"	0.75"	8	5"	00000000	000000
2 1/2	40	600 psi @ 72° F	300 psi @ 360° F	7 1/2"	3/4"	0.875"	8	5 7/8"	00000000	000000
3	48	600 psi @ 72° F	300 psi @ 360° F	8 1/4"	3/4"	0.875"	8	6 5/8"	00000000	000000
4	64	600 psi @ 72° F	300 psi @ 360° F	10"	3/4"	0.875"	8	7 7/8"	00000000	000000
6	96	600 psi @ 72° F	300 psi @ 360° F	12 1/2"	3/4"	0.875"	12	10 5/8"	00000000	000000
8	__	600 psi @ 72° F	300 psi @ 360° F	15"	7/8"	1"	12	13"	00000000	000000
10	__	600 psi @ 72° F	300 psi @ 360° F	17 1/2"	1"	1.12"	16	15 1/4"	00000000	00000000
Pressure Class 600
1/2	08	1,200 psi @ 72° F	840 psi @ 400° F	3 3/4"	1/2"	0.62"	4	2 5/8"	0000000	00000
3/4	12	1,200 psi @ 72° F	840 psi @ 400° F	4 5/8"	5/8"	0.75"	4	3 1/4"	0000000	000000
1	16	1,200 psi @ 72° F	840 psi @ 400° F	4 7/8"	5/8"	0.75"	4	3 1/2"	0000000	000000
1 1/4	20	1,200 psi @ 72° F	840 psi @ 400° F	5 1/4"	5/8"	0.75"	4	3 7/8"	0000000	000000
1 1/2	24	1,200 psi @ 72° F	840 psi @ 400° F	6 1/8"	3/4"	0.875"	4	4 1/2"	0000000	000000
2	32	1,200 psi @ 72° F	840 psi @ 400° F	6 1/2"	5/8"	0.75"	8	5"	0000000	000000
2 1/2	40	1,200 psi @ 72° F	840 psi @ 400° F	7 1/2"	3/4"	0.88"	8	5 7/8"	0000000	000000
3	48	1,200 psi @ 72° F	840 psi @ 400° F	8 1/4"	3/4"	0.88"	8	6 5/8"	0000000	000000
4	64	1,200 psi @ 72° F	840 psi @ 400° F	10 3/4"	7/8"	1"	8	8 1/2"	0000000	000000

High-Pressure Stainless Steel Unthreaded SAE Pipe Flanges

Create an access point in a high-pressure hydraulic fluid line with these flanges. They are also known as Code 61 SAE hydraulic flanges. To connect, bolt a flange with an O-ring groove surface to a flange with a flat surface of the same size. Flanges are 316 stainless steel for excellent corrosion resistance. Cap flanges are also known as blind flanges.

For technical drawings and 3-D models, click on a part number.

Caps with Flat Surface on Back

Front

Back

For Use With: Hydraulic Fluid
Specifications Met: SAE J518, ISO 6162

			Flange					Bolt Hole			316/316L Stainless Steel
SAE Flange Size	Dash Size	Max. Pressure	Ht.	Wd.	Dp.	Mounting Hardware Included	For Bolt Dia.	Dia.	No. of	Ctr.-to-Ctr.		Each
3/4	12	5,000 psi @ 72° F	2 5/8"	1 3/4"	1 13/64"	No	3/8"	0.406"	4	7/8", 1 7/8"	00000000	0000000
1	16	4,600 psi @ 72° F	2 53/64"	2"	1 29/64"	No	3/8"	0.406"	4	1.031", 2.063"	00000000	000000
1 1/2	24	3,000 psi @ 72° F	3 3/4"	2 3/4"	1 45/64"	No	1/2"	0.531"	4	1.406", 2 3/4"	00000000	000000
2	32	3,000 psi @ 72° F	4"	3 1/4"	1 45/64"	No	1/2"	0.531"	4	1.688", 3.063"	00000000	000000

Caps with O-Ring Groove Surface on Back

Front

Back

For Use With: Hydraulic Fluid
Specifications Met: SAE J518, ISO 6162

			Flange					Bolt Hole			316/316L Stainless Steel
SAE Flange Size	Dash Size	Max. Pressure	Ht.	Wd.	Dp.	Mounting Hardware Included	For Bolt Dia.	Dia.	No. of	Ctr.-to-Ctr.		Each
Inch
3/4	12	5,000 psi @ 72° F	2 5/8"	1 3/4"	1 13/64"	Yes	3/8"	0.406"	4	7/8" 1 7/8"	00000000	0000000
1	16	4,600 psi @ 72° F	2 53/64"	2"	1 29/64"	Yes	3/8"	0.406"	4	1.031" 2.063"	00000000	000000
1 1/2	24	3,000 psi @ 72° F	3 3/4"	2 3/4"	1 45/64"	Yes	1/2"	0.531"	4	1.406" 2 3/4"	00000000	000000
2	32	3,000 psi @ 72° F	4"	3 1/4"	1 45/64"	Yes	1/2"	0.531"	4	1.688" 3.063"	00000000	000000
Metric
3/4	12	5,000 psi @ 72° F	67mm	44mm	31mm	Yes	10mm	10mm	4	22mm 48mm	00000000	000000
1	16	4,600 psi @ 72° F	72mm	51mm	37mm	Yes	10mm	10mm	4	26mm 52mm	00000000	000000
1 1/2	24	3,000 psi @ 72° F	95mm	70mm	43mm	Yes	12mm	13mm	4	36mm 70mm	00000000	000000
2	32	3,000 psi @ 72° F	102mm	83mm	43mm	Yes	12mm	13mm	4	43mm 78mm	00000000	000000

Ultra-High-Vacuum Flanges and Fittings for Stainless Steel Tubing

For Use With: Air
Temperature Range:
Flanges: -300° to 800° F
Gaskets: Not Rated
Tubing: Use with 304/304L and 316/316L stainless steel
Specifications Met:
Flanges: ASTM A240, ASTM E45, ASTM E12
Gaskets: ASTM B152-179, ASTM F68

Create access points in ultra-high-vacuum lines or chambers by bolting two same-size flanges together with a copper gasket (sold separately) between them. The flanges’ sharp edges dig into the copper gasket and form an extremely tight seal, which means they handle higher vacuum pressures than other high-vacuum fittings with rubber gaskets. Also known as CF, Conflat, and UHV fittings, use them in vacuum coating, heat treating, and drying applications, as well as for leak testing and analyzing gases. They’re stainless steel so they resist rusting.

Caps are also known as blind flanges.

Bolt kits are required to make a complete connection.

For technical drawings and 3-D models, click on a part number.

Caps

Cap

					Bolt Hole
For Tube OD	Flange OD	High-Vacuum Flange Size	High Vacuum Connection Type	Bolt Circle Dia.	Dia.	No. of	Bolts Included	No. of Bolt Kits Required	Lg.	Max. Vacuum	Material	Appearance		Each
Fixed
3/4"	1 21/64"	16	CF	1 1/16"	11/64"	6	No	1	5/16"	1 × 10 ^-13 torr @72° F	304 Stainless Steel	Polished	0000000	000000
1 1/2"	2 3/4"	40	CF	2 5/16"	17/64"	6	No	1	1/2"	1 × 10 ^-13 torr @72° F	304 Stainless Steel	Polished	0000000	00000
2 1/2"	4 1/2"	63	CF	3 5/8"	21/64"	8	No	1	11/16"	1 × 10 ^-13 torr @72° F	304 Stainless Steel	Polished	0000000	00000
4"	6"	100	CF	5 1/8"	21/64"	16	No	2	25/32"	1 × 10 ^-13 torr @72° F	304 Stainless Steel	Polished	0000000	000000

Gaskets

Gasket

For Tube OD	For Flange OD	Gasket Material	Specifications Met		Each
3/4"	1 21/64"	Copper	ASTM F68	0000000	00000
1 1/2"	2 3/4"	Copper	ASTM F68	0000000	0000
2 1/2"	4 1/2"	Copper	ASTM F68	0000000	0000
4"	6"	Copper	ASTM F68	0000000	00000

Bolt Kits

Bolt Kit

For Flange OD	For High-Vacuum Flange Size	Bolt Dia.	Thread Size	No. of Bolts Included	No. of Nuts Included	No. of Washers Included	Bolt Material		Each
1 21/64"	16	0.167"	8-32	6	6	12	18-8 Stainless Steel	0000000	00000
2 3/4"	40	1/4"	1/4"-28	6	6	12	18-8 Stainless Steel	0000000	00000
4 1/2"	63	5/16"	5/16"-24	8	8	16	18-8 Stainless Steel	0000000	00000
6"	100	5/16"	5/16"-24	8	8	16	18-8 Stainless Steel	0000000	00000