Slip-On Weld Reducers | McMaster-Carr

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230 psi @ 300° F

150 psi @ 360° F

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28 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 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.

Slip-on weld flanges have no internal stop; slide a pipe through the flange and weld on both sides. Reducing flanges let you transition your piping system to a smaller pipe size; attach to a flange with a larger pipe size but with the same flange dimensions. Forged flanges have better strength than cast flanges. 304 stainless steel flanges offer very good corrosion resistance. 316 stainless steel flanges have excellent corrosion resistance.

Slip-On Weld Reducing Flanges—Forged

Front

Raised Surface on Back

Front

For Use With: Air, Natural Gas, Oil, Steam, Water
Pressure Class: 150
Specifications Met: ASME B16.5
Fittings: Use schedule 40 stainless steel
Pipe Nipples and Pipe: Use Schedule 40 stainless steel

				Bolt Hole
Pipe Size	For Flange Pipe Size	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Diameter	Max. Pressure	Max. Steam Pressure		Each
304/304L Stainless Steel
3/4	1	4 1/4"	1/2"	0.62"	4	3 1/8"	230 psi @ 72° F	150 psi @ 360° F	44685K344	000000
1	1 1/2	5"	1/2"	0.62"	4	3 7/8"	230 psi @ 72° F	150 psi @ 360° F	44685K345	00000
1	2	6"	5/8"	3/4"	4	4 3/4"	230 psi @ 72° F	150 psi @ 360° F	44685K131	000000
1 1/2	2	6"	5/8"	3/4"	4	4 3/4"	230 psi @ 72° F	150 psi @ 360° F	44685K346	000000
2	3	7 1/2"	5/8"	3/4"	4	6"	230 psi @ 72° F	150 psi @ 360° F	44685K132	000000
2	4	9"	5/8"	3/4"	8	7 1/2"	230 psi @ 72° F	150 psi @ 360° F	44685K347	000000
3	4	9"	5/8"	3/4"	8	7 1/2"	230 psi @ 72° F	150 psi @ 360° F	44685K133	000000
4	6	11"	3/4"	7/8"	8	9 1/2"	230 psi @ 72° F	150 psi @ 360° F	44685K134	000000
6	8	13 1/2"	3/4"	7/8"	8	11 3/4"	230 psi @ 72° F	150 psi @ 360° F	44685K135	000000
316/316L Stainless Steel
3/4	1	4 1/4"	1/2"	0.62"	4	3 1/8"	230 psi @ 72° F	150 psi @ 360° F	44695K272	000000
1	1 1/2	5"	1/2"	0.62"	4	3 7/8"	230 psi @ 72° F	150 psi @ 360° F	44695K273	000000
1	2	6"	5/8"	3/4"	4	4 3/4"	230 psi @ 72° F	150 psi @ 360° F	44695K131	000000
1 1/2	2	6"	5/8"	3/4"	4	4 3/4"	230 psi @ 72° F	150 psi @ 360° F	44695K274	000000
2	3	7 1/2"	5/8"	3/4"	4	6"	230 psi @ 72° F	150 psi @ 360° F	44695K132	000000
2	4	9"	5/8"	3/4"	8	7 1/2"	230 psi @ 72° F	150 psi @ 360° F	44695K275	000000
3	4	9"	5/8"	3/4"	8	7 1/2"	230 psi @ 72° F	150 psi @ 360° F	44695K133	000000
4	6	11"	3/4"	7/8"	8	9 1/2"	230 psi @ 72° F	150 psi @ 360° F	44695K134	000000

Low-Pressure 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. Flanges are for use with low-pressure applications in noncorrosive environments.

Slip-on weld flanges have no internal stop. Slide a pipe through the flange and weld on both sides.

Reducing flanges let you transition your piping system to a smaller pipe. Attach to a flange with a larger pipe size but with the same flange dimensions.

Inch Slip-On Weld Reducing Flanges

Front

Raised Surface on Back

For Use With: Air, Natural Gas, Oil, Steam, Water
Pressure Class: 150
Specifications Met: ASME B16.5, ASTM A105
Certification: Material Certificate with Traceable Lot Number and Test Report
Pipe Nipples and Pipe: Use Schedule 40 steel
Fittings: Use Schedule 40 steel

				Bolt Hole
Pipe Size	For Flange Pipe Size	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Max. Pressure	Max. Steam Pressure		Each
3/4	1	4 1/4"	1/2"	5/8"	4	3 1/8"	285 psi @ 72° F	230 psi @ 300° F	68095K187	000000
1	1 1/2	5"	1/2"	5/8"	4	3 7/8"	285 psi @ 72° F	230 psi @ 300° F	68095K188	00000
1	2	6"	5/8"	3/4"	4	4 3/4"	285 psi @ 72° F	230 psi @ 300° F	68095K189	00000
1 1/2	2	6"	5/8"	3/4"	4	4 3/4"	285 psi @ 72° F	230 psi @ 300° F	68095K62	000000
2	3	7 1/2"	5/8"	3/4"	4	6"	285 psi @ 72° F	230 psi @ 300° F	68095K63	000000
2	4	9"	5/8"	3/4"	8	7 1/2"	285 psi @ 72° F	230 psi @ 300° F	68095K191	000000
3	4	9"	5/8"	3/4"	8	7 1/2"	285 psi @ 72° F	230 psi @ 300° F	68095K64	000000
4	6	11"	3/4"	7/8"	8	9 1/2"	285 psi @ 72° F	230 psi @ 300° F	68095K65	000000
6	8	13 1/2"	3/4"	7/8"	8	11 3/4"	285 psi @ 72° F	230 psi @ 300° F	68095K66	000000

Aluminum Unthreaded Pipe Flanges

Also known as Pressure Class 125 flanges, these are for use in low-pressure applications. Bolt two same-size flanges together with a gasket (sold separately) to create an access point within a line. Flanges are aluminum, which is lightweight with good corrosion resistance. Slip-on weld flanges have no internal stop; slide a pipe through the flange and weld on both sides. Reducing flanges let you transition your system to a smaller pipe size; attach to a flange with a larger pipe size but with the same flange dimensions.

Slip-On Weld Reducing Flanges

Front

Flat Surface on Back

For Use With: Air, Oil, Water
Pressure Class: 125
Specifications Met: ASME B16.1
Fittings: Use Schedule 40 aluminum
Pipe: Use Schedule 40 aluminum

				Bolt Hole
Pipe Size	For Flange Pipe Size	Flange OD	For Bolt Dia.	Dia.	No. of	Bolt Circle Dia.	Max. Pressure		Each
3	4	9"	5/8"	3/4"	8	7 1/2"	150 psi @ 72° F	44705K768	0000000
6	8	13 1/2"	3/4"	7/8"	8	11 3/4"	150 psi @ 72° F	44705K771	000000