3 1/2 Flanges | McMaster-Carr

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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.

About Hex Head Screws and Bolts

Front

Flat Surface on Back

For Use With: Air, Diesel Fuel, Gasoline, Natural Gas, Oil, Steam, Water
Pressure Class: 125
Specifications Met: ASME B1.20.1, ASME B16.1, ASTM A126, FM Approved
Pipe Nipples and Pipe: Use Schedule 40 steel
Fittings: Use Class 125 or 150 iron and steel

FM-approved for fire protection applications, these flanges are cast iron, so they're brittle and can be quickly opened by hitting them with a sledge hammer. Bolt them together with a gasket (not included) to create an access point within a low-pressure pipe line. All are cap flanges, which are also known as blind flanges. Use them in noncorrosive environments.

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

			Bolt Hole
Pipe Size	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Max. Pressure	Max. Steam Pressure		Each
3 1/2	8 1/2"	5/8"	3/4"	8	7"	200 psi @ 72° F	165 psi @ 300° F	0000000	0000000

Low-Pressure Steel Threaded Pipe Flanges

Use these flanges for low-pressure applications in noncorrosive environments. Bolt two flanges of the same size together with a gasket (sold separately) to create an access point within a line.

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

Flanges

Front

Raised Surface on Back

For Use With: Air, Natural Gas, Oil, Steam, Water
Pressure Class: 150
Specifications Met:
NPT: ASME B16.5, ASTM A105, MSS SP-25
BSPT: ASTM A105
Fittings: Use Class 125 or 150 iron and steel
Pipe Nipples and Pipe: Use Schedule 40 steel

			Bolt Hole
Pipe Size	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Max. Pressure	Max. Steam Pressure	Material		Each
NPT
3 1/2	8 1/2"	5/8"	3/4"	8	7"	285 psi @ 72° F	230 psi @ 300° F	Steel	000000000	0000000

Oil-Resistant Compressible Buna-N Pipe Gaskets with Bolt Holes

Made of Buna-N rubber, these gaskets compress to ensure a tight seal. They resist oil, water, and salts. Commonly called full-face gaskets, they cover the entire face of flat-surface pipe flanges and align with the bolt holes.

Gaskets for ANSI class flanges are sized so all gasket specifications meet ANSI standards. Gaskets for ANSI Class 150 flanges are compatible with low-pressure pipe flanges. Gaskets for ANSI Class 300 flanges are compatible with medium-pressure pipe flanges.

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

Gaskets for ANSI Flanges

For ANSI Class 150
For Pipe Size	ID	OD	No. of Bolt Holes	Max. Pressure, psi	Temperature Range, °F	Hardness	Hardness Rating	Color		1/16"	1/8"
3 1/2	4"	8 1/2"	8	800	-20° to 170°	Durometer 60A	Medium Hard	Black	00000000	00000	00000
For ANSI Class 300
3 1/2	4"	9"	8	800	-20° to 170°	Durometer 60A	Medium Hard	Black	00000000	00	00000

Oil-Resistant Aramid/Buna-N Pipe Gaskets with Bolt Holes

These blended aramid fiber/Buna-N rubber gaskets resist oil, water, and aliphatic hydrocarbons such as ethylene. Commonly called full-face gaskets, they cover the entire face of flat-surface pipe flanges and align with the bolt holes.

Adhesive-back gaskets stay in place to make installation easier.

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

Gaskets

For ANSI Class 150
For Pipe Size	ID	OD	No. of Bolt Holes	Max. Pressure, psi	Temperature Range, °F	Color		1/32" Thick.	1/16" Thick.	1/8" Thick.
3 1/2	4"	8 1/2"	8	1,000	-100° to 400°	Blue	00000000	00000	00000	000000
For ANSI Class 300
3 1/2	4"	9"	8	1,000	-100° to 400°	Blue	00000000	00	00000	00000

Adhesive-Back Gaskets

							Adhesive		1/16" Thick.
For Pipe Size	ID	OD	No. of Bolt Holes	Max. Pressure, psi	Temperature Range, °F	Color	Type	Max.Temperature, °F		Each
For ANSI Class 150
3 1/2	4"	8 1/2"	8	1,000	-100° to 400°	Blue	Acrylic	125°	0000000	00000
For ANSI Class 300
3 1/2	4"	9"	8	1,000	-100° to 400°	Blue	Acrylic	125°	0000000	00000

Oil-Resistant Aramid/Buna-N Pipe Gaskets with Bolt Holes and Fasteners

Plain Backing

Each gasket comes with enough bolts and nuts to create a connection between two steel pipe flanges. Commonly called full-face gaskets, they cover the entire face of flat-surface pipe flanges and align with the bolt holes. They’re made from blended aramid fiber/Buna-N rubber and resist oil, water, and aliphatic hydrocarbons such as ethylene.

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

Gaskets for ANSI Flanges

							1/16" Thick.		1/8" Thick.
For Pipe Size	ID	OD	No. of Bolt Holes	Max. Pressure, psi	Temperature Range, °F	Color		Each		Each
For ANSI Class 150
3 1/2	4"	8 1/2"	8	725	-40° to 450°	Green	0000000	000000	00000000	000000
For ANSI Class 300
3 1/2	4"	9"	8	725	-40° to 450°	Green	00000000	00000	00000000	00000

Water- and Steam-Resistant EPDM Pipe Gaskets with Bolt Holes

Made of EPDM rubber, these gaskets resist water, steam, and salt water. Commonly called full-face gaskets, they cover the entire face of flat-surface pipe flanges and align with the bolt holes.

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

Gaskets

1/16" Thick.
For Pipe Size	ID	OD	No. of Bolt Holes	Max. Pressure, psi	Temperature Range, °F	Hardness	Hardness Rating	Color		Each
For ANSI Class 150
3 1/2	4"	8 1/2"	8	800	-20° to 220°	Durometer 60A	Medium Hard	Black	00000000	00000
For ANSI Class 300
3 1/2	4"	9"	8	800	-20° to 220°	Durometer 60A	Medium Hard	Black	00000000	0000
1/8" Thick.
For ANSI Class 150
3 1/2	4"	8 1/2"	8	800	-20° to 220°	Durometer 60A	Medium Hard	Black	00000000	00000
For ANSI Class 300
3 1/2	4"	9"	8	800	-20° to 220°	Durometer 60A	Medium Hard	Black	00000000	00000

Water-Resistant Aramid/SBR Pipe Gaskets with Bolt Holes

Aramid fibers are blended with SBR rubber for resistance to water, inert gases, and abrasion. Commonly called full-face gaskets, these cover the entire face of flat-surface pipe flanges and align with the bolt holes. All gasket specifications are sized to meet ANSI standards. Gaskets for ANSI Class 150 flanges are compatible with low-pressure pipe flanges. Gaskets for ANSI Class 300 flanges are compatible with medium-pressure pipe flanges.

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

For ANSI Class 150
For Pipe Size	ID	OD	Thick.	No. of Bolt Holes	Max. Pressure, psi	Temperature Range, °F	Color		Each
3 1/2	4"	8 1/2"	1/16"	8	1,200	-100° to 400°	White	0000000	000000
For ANSI Class 300
3 1/2	4"	9"	1/16"	8	1,200	-100° to 400°	White	0000000	00000

Ultra-Chemical-Resistant Compressible PTFE Pipe Gaskets with Bolt Holes

Also known as Gore GR, these soft expanded PTFE gaskets are more compressible than pure PTFE to ensure a tight seal. They are chemically inert (except to molten alkali metal and fluorine compounds). Commonly called full-face gaskets, they cover the entire face of flat-surface pipe flanges and align with the bolt holes. All gasket specifications are sized to meet ANSI standards. Gaskets for ANSI Class 150 flanges are compatible with low-pressure pipe flanges. Gaskets for ANSI Class 300 flanges are compatible with medium-pressure pipe flanges.

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

						1/16" Thick.		1/8" Thick.
For Pipe Size	ID	OD	No. of Bolt Holes	Temperature Range, °F	Color		Each		Each
For ANSI Class 150
3 1/2	4"	8 1/2"	8	-450° to 600°	White	000000000	000000	000000000	000000

Ultra-Chemical-Resistant Food Industry
Compressible PTFE Pipe Gaskets with Bolt Holes

Made of FDA-listed material for use with food and beverage, these soft expanded PTFE gaskets compress to ensure a tight seal. They are chemically inert (except to molten alkali metal and fluorine compounds). Commonly called full-face gaskets, they cover the entire face of flat-surface pipe flanges and align with the bolt holes. All gasket specifications are sized to meet ANSI standards. Gaskets for ANSI Class 150 flanges are compatible with low-pressure pipe flanges. Gaskets for ANSI Class 300 flanges are compatible with medium-pressure pipe flanges.

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

1/16" Thick.
For Pipe Size	ID	OD	No. of Bolt Holes	Temperature Range, °F	Color	Specifications Met		Each
For ANSI Class 150
3 1/2	4"	8 1/2"	8	-450° to 350°	White	FDA Compliant 21 CFR 177.1550, USP Class VI	0000000	000000
1/8" Thick.
For ANSI Class 150
3 1/2	4"	8 1/2"	8	-450° to 350°	White	FDA Compliant 21 CFR 177.1550, USP Class VI	0000000	00000

Ultra-Chemical-Resistant Compressible PTFE Pipe
Gaskets with Bolt Holes for Low Stress-to-Seal Flanges

Form a seal even under the low torque needed for fiberglass flanges. Also known as Gore UPG, these gaskets are made from soft expanded PTFE. They fill gaps in pitted and corroded flanges and make up for uneven bolt load resulting from vibration and incorrect installation. They’re chemically inert (except to molten alkali metal and fluorine compounds). Commonly called full-face gaskets, they cover the entire face of flat-surface pipe flanges and align with the bolt holes. All gasket specifications are sized to meet ANSI standards. They’re compatible with ANSI Class 150 low-pressure pipe flanges.

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

						1/16" Thick.
For Pipe Size	ID	OD	No. of Bolt Holes	Temperature Range, °F	Color		Each
For ANSI Class 150
3 1/2	4"	8 1/2"	8	-450° to 600°	White	00000000	000000

Ultra-Chemical-Resistant PTFE Pipe Gaskets with Bolt Holes

Made of pure PTFE, these gaskets have a slippery surface that prevents sticking. They are chemically inert (except to molten alkali metal and fluorine compounds). Commonly called full-face gaskets, these cover the entire face of flat-surface pipe flanges and align with the bolt holes. All gasket specifications are sized to meet ANSI standards. Gaskets for ANSI Class 150 flanges are compatible with low-pressure pipe flanges.

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

1/16" Thick.
For Pipe Size	ID	OD	No. of Bolt Holes	Temperature Range, °F	Hardness	Hardness Rating	Color		Each
For ANSI Class 150
3 1/2	4"	8 1/2"	8	-450° to 500°	Durometer 50D	Medium Soft	White	0000000	000000
1/8" Thick.
For ANSI Class 150
3 1/2	4"	8 1/2"	8	-450° to 500°	Durometer 50D	Medium Soft	White	0000000	00000

Ultra-Chemical-Resistant High-Strength PTFE Pipe Gaskets with Bolt Holes

A fiberglass filler in these PTFE gaskets provides strength to prevent them from thinning out when compressed. They resist hydrocarbons, solvents, refrigerants, and moderate concentrations of acids. Commonly called full-face gaskets, they cover the entire face of flat-surface pipe flanges and align with the bolt holes. All gasket specifications are sized to meet ANSI standards. Gaskets for ANSI Class 150 flanges are compatible with low-pressure pipe flanges.

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

For ANSI Class 150
For Pipe Size	ID	OD	Thick.	No. of Bolt Holes	Max. Pressure, psi	Temperature Range, °F	Color		Each
3 1/2	4"	8 1/2"	1/16"	8	800	-450° to 500°	Blue	0000000	000000

Chemical-Resistant Viton® Fluoroelastomer Pipe Gaskets with Bolt Holes

These gaskets resist boric acid, citric acid, isopropyl alcohol, fuel, oil, and transmission fluid. Commonly called full-face gaskets, they cover the entire face of flat-surface pipe flanges and align with the bolt holes.

Gaskets for ANSI class flanges are sized so all gasket specifications meet ANSI standards. Gaskets for ANSI Class 150 flanges are compatible with low-pressure pipe flanges.

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

Gaskets

For ANSI Class 150
For Pipe Size	ID	OD	No. of Bolt Holes	Max. Pressure	Temperature Range, °F	Color		1/16" Thick.	1/8" Thick.
3 1/2	4"	8 1/2"	8	Not Rated	-20° to 450°	Black	00000000	000000	000000

High-Temperature Graphite Pipe Gaskets with Bolt Holes

Able to withstand temperatures up to 750° F, these graphite gaskets have a stainless steel insert for strength to handle pressure up to 1,000 psi. Commonly called full-face gaskets, they cover the entire face of flat-surface pipe flanges and align with the bolt holes.

All gaskets are sized to meet ANSI standards. Gaskets for ANSI Class 150 flanges are compatible with low-pressure pipe flanges.

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

For ANSI Class 150
For Pipe Size	ID	OD	Thick.	No. of Bolt Holes	Max. Pressure, psi	Temperature Range, °F	Color		Each
3 1/2	4"	8 1/2"	1/16"	8	1,000	-325° to 750°	Gray	00000000	000000

High-Temperature Silicone Pipe Gaskets with Bolt Holes

Resistant to water and salts, these silicone rubber gaskets can handle temperatures up to 450° F. Commonly called full-face gaskets, they cover the entire face of flat-surface pipe flanges and align with the bolt holes. Gaskets are compatible with low-pressure pipe flanges; all gasket specifications are sized to meet ANSI standards.

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

For ANSI Class 150
For Pipe Size	ID	OD	No. of Bolt Holes	Max. Pressure, psi	Temperature Range, °F	Hardness	Hardness Rating	Color		1/16" Thick.	1/8" Thick.
3 1/2	4"	8 1/2"	8	600	-80° to 450°	Durometer 60A	Medium Hard	Red	00000000	000000	000000

High-Temperature Oil-Resistant Carbon/Buna-N Pipe Gaskets with Bolt Holes

Carbon is blended with Buna-N rubber for gaskets that are unaffected by oil and temperatures up to 650° F. Commonly called full-face gaskets, they cover the entire face of flat-surface pipe flanges and align with the bolt holes. Gaskets are compatible with low-pressure pipe flanges; all gasket specifications are sized to meet ANSI standards.

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

For ANSI Class 150
For Pipe Size	ID	OD	Thick.	No. of Bolt Holes	Max. Pressure, psi	Temperature Range, °F	Color		Each
3 1/2	4"	8 1/2"	1/16"	8	2,000	-100° to 650°	Black	0000000	000000

High-Temperature Metallic Pipe Gaskets

Gasket Shown with
a Flat-Surface
Pipe Flange

Gasket Shown with a Raised-Surface Pipe Flange

Also known as spiral-wound gaskets, these have a 1/8” thick carbon steel outer ring and a 304 stainless steel sealing element with a graphite-based filler. The metal construction provides structural strength. These gaskets can be used with both flat-surface and raised-surfaces pipe flanges; they fit the surface inside the bolt holes and do not interfere with the bolt connection.

Gaskets for ANSI class flanges are sized so all gasket specifications meet ANSI standards. Gaskets for ANSI Class 600 flanges are compatible with high-pressure pipe flanges. Gaskets for ANSI Class 1500 flanges are compatible with extreme-pressure pipe flanges.

Gaskets with an inner ring prevent flange erosion.

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

For ANSI Class 600

				Sealing Element
For Pipe Size	ID	OD	Thick.	OD	Wd.	Max. Pressure	Temperature Range, °F	Material	Sealing Element Material	Sealing Element Filler Material	Specifications Met		Each
3 1/2	4 1/8"	6 3/8"	1/8"	5 1/4"	0.175"	Not Rated	-50° to 840°	Carbon Steel	304 Stainless Steel	Graphite	ASME B16.20	000000000	000000

For ANSI Class 1500

				Sealing Element
For Pipe Size	ID	OD	Thick.	OD	Wd.	Inner Ring ID	Max. Pressure	Temperature Range, °F	Material	Sealing Element Material	Sealing Element Filler Material	Inner Ring Material	Specifications Met		Each
3 1/2	4 1/8"	7 3/8"	1/8"	5 1/4"	0.175"	3.69"	Not Rated	-50° to 840°	Carbon Steel	304 Stainless Steel	Graphite	304 Stainless Steel	ASME B16.20	000000000	000000

Long-Life High-Temperature Metallic Pipe Gaskets

Gasket Shown with
a Flat-Surface
Pipe Flange

Gasket Shown with a Raised-Surface Pipe Flange

A space between the outer ring and the sealing element prevents the element from being squeezed inward and contaminating the process line. Also known as spiral-wound gaskets, these have a 1/8” thick carbon steel outer ring and a 304 stainless steel sealing element with a graphite-based filler. The metal construction of these gaskets provides structural strength. They compensate for flange movement caused by vibration and pressure. These gaskets can be used on both flat-surface and raised-surface pipe flanges; they fit inside the bolt holes and do not interfere with the bolt connections. All gasket specifications are sized to meet ANSI standards. Gaskets for ANSI Class 150 flanges are compatible with low-pressure pipe flanges. Gaskets for ANSI Class 300 flanges are compatible with medium-pressure pipe flanges.

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

				Sealing Element
For Pipe Size	ID	OD	Thick.	OD	Wd.	Max. Pressure	Temperature Range, °F	Material	Sealing Element Material	Sealing Element Filler Material		Each
For ANSI Class 150
3 1/2	4 1/8"	6 3/8"	1/8"	4.859"	0.175"	Not Rated	-40° to 850°	Carbon Steel	304 Stainless Steel	Graphite	0000000	000000
For ANSI Class 300
3 1/2	4 1/8"	6 1/2"	1/8"	4.859"	0.175"	Not Rated	-40° to 850°	Carbon Steel	304 Stainless Steel	Graphite	0000000	00000

High-Temperature Silicone Pipe Gaskets

In addition to withstanding temperatures up to 450° F, these silicone rubber gaskets resist water and salts. Also known as ring gaskets, use them with raised-surface pipe flanges; they fit the surface inside the bolt holes and do not interfere with the bolt connection. Gaskets are compatible with low-pressure pipe flanges; all gasket specifications are sized to meet ANSI standards.

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

For ANSI Class 150
For Pipe Size	ID	OD	Max. Pressure, psi	Temperature Range, °F	Hardness	Hardness Rating	Color		1/16" Thick.	1/8" Thick.
3 1/2	4"	6 3/8"	600	-80° to 450°	Durometer 60A	Medium Hard	Red	00000000	00000	000000

Ultra-Chemical-Resistant Food Industry Compressible PTFE Pipe Gaskets

These soft expanded PTFE gaskets are made of FDA-listed material for use with food and beverage. They are chemically inert (except to molten alkali metal and fluorine compounds) and are compressible to ensure a tight seal. Also known as ring gaskets, use them with raised-surface pipe flanges; they fit the surface inside the bolt holes and do not interfere with the bolt connection. All gasket specifications are sized to meet ANSI standards. Gaskets for ANSI Class 300 flanges are compatible with medium-pressure pipe flanges.

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

1/16" Thick.
For Pipe Size	ID	OD	Temperature Range, °F	Color	Specifications Met		Each
For ANSI Class 300
3 1/2	4"	6 1/2"	-450° to 350°	White	FDA Compliant 21 CFR 177.1550, USP Class VI	00000000	000000
1/8" Thick.
For ANSI Class 300
3 1/2	4"	6 1/2"	-450° to 350°	White	FDA Compliant 21 CFR 177.1550, USP Class VI	0000000	00000

Ultra-Chemical-Resistant Compressible PTFE Pipe Gaskets

Also called Gore GR ring gaskets, these gaskets are made of soft expanded PTFE, which is more compressible than pure PTFE to ensure a tight seal. They are chemically inert (except to molten alkali metal and fluorine compounds). Use them with raised-surface pipe flanges; they fit the surface inside the bolt holes and do not interfere with the bolt connection. All gasket specifications are sized to meet ANSI standards. Gaskets for ANSI Class 300 flanges are compatible with medium-pressure pipe flanges.

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

					1/16" Thick.		1/8" Thick.
For Pipe Size	ID	OD	Temperature Range, °F	Color		Each		Each
For ANSI Class 300
3 1/2	4"	6 1/2"	-450° to 600°	White	000000000	000000	000000000	000000

Chemical-Resistant Viton® Fluoroelastomer Pipe Gaskets

Resistant to boric acid, citric acid, isopropyl alcohol, fuel, oil, and transmission fluid, these gaskets are also known as ring gaskets. They are for use on raised-surface pipe flanges; they fit the surface inside the bolt holes and do not interfere with the bolt connection.

Gaskets for ANSI class flanges are sized so all gasket specifications meet ANSI standards. Gaskets for ANSI Class 150 flanges are compatible with low-pressure pipe flanges.

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

Gaskets

For ANSI Class 150
For Pipe Size	ID	OD	Max. Pressure	Temperature Range, °F	Color		1/16" Thick.	1/8" Thick.
3 1/2	4"	6 3/8"	Not Rated	-20° to 450°	Black	00000000	000000	000000

Water- and Steam-Resistant EPDM Pipe Gaskets

Resistant to water, steam, and salt water, these gaskets are EPDM rubber. Commonly called ring gaskets, use them with raised-surface pipe flanges; they fit the surface inside the bolt holes and do not interfere with the bolt connection.

Adhesive-back gaskets stay in place to make installation easier.

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

Gaskets

1/16" Thick.
For Pipe Size	ID	OD	Max. Pressure, psi	Temperature Range, °F	Hardness	Hardness Rating	Color		Each
For ANSI Class 150
3 1/2	4"	6 3/8"	800	-20° to 220°	Durometer 60A	Medium Hard	Black	00000000	00000
1/8" Thick.
For ANSI Class 150
3 1/2	4"	6 3/8"	800	-20° to 220°	Durometer 60A	Medium Hard	Black	0000000	0000
For ANSI Class 300
3 1/2	4"	6 1/2"	800	-20° to 220°	Durometer 60A	Medium Hard	Black	00000000	0000

Adhesive-Back Gaskets

								Adhesive		1/16" Thick.
For Pipe Size	ID	OD	Max. Pressure, psi	Temperature Range, °F	Hardness	Hardness Rating	Color	Type	Max. Temperature, ° F		Each
For ANSI Class 150
3 1/2	4"	6 3/8"	800	-20° to 220°	Durometer 60A	Medium Hard	Black	Acrylic	105º	0000000	00000
For ANSI Class 300
3 1/2	4"	6 1/2"	800	-20° to 220°	Durometer 60A	Medium Hard	Black	Acrylic	105º	0000000	0000

Water- and Abrasion-Resistant SBR Pipe Gaskets

The all-SBR rubber construction of these gaskets provides better abrasion resistance than blended aramid/SBR gaskets. Also known as ring gaskets, use them with raised-surface pipe flanges; they fit the surface inside the bolt holes and do not interfere with the bolt connection. Gaskets are compatible with low-pressure pipe flanges; all gasket specifications are sized to meet ANSI standards.

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

For ANSI Class 150
For Pipe Size	ID	OD	Thick.	Max. Pressure, psi	Temperature Range, °F	Hardness	Hardness Rating	Color	Pkg. Qty.		Pkg.
3 1/2	4"	6 3/8"	1/8"	800	-20° to 170°	Durometer 75A	Hard	Red	6	0000000	000000

Water-Resistant Aramid/SBR Pipe Gaskets

Aramid fibers and SBR rubber are blended for resistance to abrasion, water, and inert gases. Also known as ring gaskets, use these gaskets with raised-surface pipe flanges; they fit the surface inside the bolt holes and do not interfere with the bolt connection. All gasket specifications are sized to meet ANSI standards. Gaskets for ANSI Class 150 flanges are compatible with low-pressure pipe flanges. Gaskets for ANSI Class 300 flanges are compatible with medium-pressure pipe flanges.

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

For ANSI Class 150
For Pipe Size	ID	OD	Thick.	Max. Pressure, psi	Temperature Range, °F	Color		Each
3 1/2	4"	6 3/8"	1/16"	1,200	-100° to 400°	White	0000000	00000
For ANSI Class 300
3 1/2	4"	6 1/2"	1/16"	1,200	-100° to 400°	White	0000000	0000

Water- and Refrigerant-Resistant Neoprene Pipe Gaskets

These neoprene gaskets resist water, refrigerants, and salts. Commonly called ring gaskets, use them with raised-surface pipe flanges; they fit the surface inside the bolt holes and do not interfere with the bolt connection. They are compatible with low-pressure pipe flanges; all gasket specifications are sized to meet ANSI standards.

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

For ANSI Class 150
For Pipe Size	ID	OD	Thick.	Max. Pressure, psi	Temperature Range, °F	Hardness	Hardness Rating	Color	Pkg. Qty.		Pkg.
3 1/2	4"	6 3/8"	1/8"	1,000	-20° to 170°	Durometer 60A	Medium Hard	Black	6	00000000	000000

Oil-Resistant Aramid/Buna-N Pipe Gaskets

In addition to oil, these blended aramid fiber/Buna-N rubber gaskets resist water and aliphatic hydrocarbons such as ethylene. Also known as ring gaskets, use them with raised-surface pipe flanges; they fit the surface inside the bolt holes and do not interfere with the bolt connection.

Adhesive-back gaskets stay in place to make installation easier.

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

Gaskets

For ANSI Class 150
For Pipe Size	ID	OD	Max. Pressure, psi	Temperature Range, °F	Color		1/32" Thick.	1/16" Thick.	1/8" Thick.
3 1/2	4 "	6 3/8 "	1,000	-100° to 400°	Blue	00000000	00000	00000	00000
For ANSI Class 300
3 1/2	4 "	6 1/2 "	1,000	-100° to 400°	Blue	00000000	00	0000	00000

Adhesive-Back Gaskets

						Adhesive		1/16" Thick.
For Pipe Size	ID	OD	Max. Pressure, psi	Temperature Range, °F	Color	Type	Max.Temperature, °F		Each
For ANSI Class 150
3 1/2	4 "	6 3/8 "	1,000	-100° to 400°	Blue	Acrylic	125°	0000000	00000
For ANSI Class 300
3 1/2	4 "	6 1/2 "	1,000	-100° to 400°	Blue	Acrylic	125°	0000000	00000

Oil-Resistant Aramid/Buna-N Pipe Gaskets with Fasteners

Furnished with enough nuts and bolts to create a connection between two steel pipe flanges. These gaskets, also known as ring gaskets, are for use on raised-surface pipe flanges; they fit the surface inside the bolt holes and do not interfere with the bolt connection. They’re made from blended aramid fiber/Buna-N rubber and resist oil, water, and aliphatic hydrocarbons such as ethylene. Gaskets are compatible with low-pressure pipe flanges; all gasket specifications are sized to meet ANSI standards.

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

For ANSI Class 150
For Pipe Size	ID	OD	Thick.	Bolt Screw Size	Bolt Lg.	Max. Pressure, psi	Temperature Range, °F	Color		Each
3 1/2	4"	6 3/8"	1/16"	5/8"	3"	725	-40° to 450°	Green	0000000	000000

Oil-Resistant Compressible Buna-N Pipe Gaskets

These compressible Buna-N rubber gaskets ensure a tight seal. They resist oil, water, and salts. Also known as ring gaskets, use them with raised-surface pipe flanges; they fit the surface inside the bolt holes and do not interfere with the bolt connection. All gasket specifications are sized to meet ANSI standards. Gaskets for ANSI Class 150 flanges are compatible with low-pressure pipe flanges.

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

For ANSI Class 150
For Pipe Size	ID	OD	Max. Pressure, psi	Temperature Range, °F	Hardness	Hardness Rating	Color		1/16" Thick.	1/8" Thick.
3 1/2	4"	6 3/8"	700	-20° to 170°	Durometer 60A	Medium Hard	Black	00000000	00000	00000

Stainless Steel Hex Screw and Nut Kits for Pipe Flanges

Stainless Steel

Use these kits to connect standard-size stainless steel pipe flanges for ANSI Class 150 or 300. They meet ASTM specifications for material quality, and the dimensions meet ASME specifications. Length of screws is measured from under the head.

18-8 stainless steel kits have good chemical resistance and may be mildly magnetic.

316 stainless steel kits are more corrosion resistant than 18-8 stainless steel and have excellent resistance to chemicals and salt water. They may be mildly magnetic.

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

	Screw						Nut
For Pipe Size	Lg.	Min. Thread Lg.	Head Wd.	Head Ht.	Tensile Strength, psi	Specifications Met	Wd.	Ht.	Specifications Met	For Max. Pressure		Each
18-8 Stainless Steel for Class 300 Stainless Steel Flanges
3/4"-10
3, 3 1/2	3 1/2"	1 3/4"	1 1/8"	15/32"	80,000	ASME B18.2.1, ASTM F593	1 1/8"	41/64"	ASME B18.2.2, ASTM F594	720 psi @ 72° F	000000000	000000
316 Stainless Steel for Class 300 Stainless Steel Flanges
3/4"-10
3, 3 1/2	3 1/2"	1 3/4"	1 1/8"	15/32"	80,000	ASME B18.2.1, ASTM F593	1 1/8"	41/64"	ASME B18.2.2, ASTM F594	720 psi @ 72° F	000000000	00000