81mm Tube Fittings | 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.

Temperature Range: See Gaskets

The smooth finish inside these fittings makes it easy to remove product residue. Also known as aseptic and tri-clamp fittings, they connect with a gasket, a clamp, and another quick-clamp fitting for a fast and easy way to access your line. The pressure rating of the fitting will vary depending on the clamp you choose, and the temperature rating will vary based on the gasket material you choose.

304 stainless steel fittings have very good corrosion resistance.

Fittings that meet DIN standards adhere to international requirements for sanitary quick-clamp fittings. 3-A certified fittings comply with sanitary standards.

Note: To complete a connection, you’ll need two quick-clamp fittings, a clamp, and a gasket (all sold separately).

Straight Adapters, Tube × Butt-Weld Tube

For Use With: Air, Beverage, Dairy, Food, Water
Tubing:
Inch: Use with welded 304/304L or 316/316L stainless steel that meets ASTM A269 or ASTM 270
Metric: Use with welded 304/304L or 316/316L stainless steel
Specifications Met: See table

Fittings with butt-weld end are also known as ferrules; they weld to tubing for a permanent, flush connection.

For Tube OD						304 Stainless Steel
Quick Clamp	Butt Weld	Flange OD	Lg.	Wall Thick.	Specifications Met		Each
Metric
81mm	85mm	106mm	28mm	2mm	3-A Certified 63-03, DIN 32676	0000000	000000

Clamps

304 Stainless Steel with Wing Nut

Clamps with wing nut tighten by hand.

304 Stainless Steel with Wing Nut
For Tube OD	For Flange OD	Max. Pressure	Specifications Met		Each
81mm	106mm	30 psi @ 72 ° F	DIN 32676	0000000	000000

Gaskets

EPDM gaskets resist water and steam and work well in humid environments.

EPDM Rubber
For Tube OD	ID	OD	Thick.	Temp. Range, °F	Color	Specifications Met		Each
81mm	81.200mm	106.000mm	0.205"	-50° to 275°	Black	DIN 32676	0000000	000000
Silicone Rubber
81mm	81.200mm	108.180mm	5.2mm	-40° to 450°	Clear	DIN 32676, FDA Compliant 21 CFR 177.2600	00000000	00000
PTFE Plastic
81mm	81.200mm	106.000mm	5.2mm	-100° to 500°	White	DIN 32676, FDA Compliant 21 CFR 177.1550	000000000	00000

Clamps for High-Polish Metal Quick-Clamp Sanitary Tube Fittings

Temperature Range: See Gaskets or O-Rings
Tubing:
Inch 304 Stainless Steel and Nylon Plastic: Use with welded 304/304L and 316/316L stainless steel that meets ASTM A269 or ASTM A270
Metric 304 Stainless Steel: Use with welded 304/304L and 316/316L stainless steel
Inch 316 Stainless Steel: Use with welded 304/304 L and 316/316L stainless steel
Metric 316 Stainless Steel: Use with welded 316/316L Stainless Steel

Connect quick-clamp sanitary tube fittings—also known as aseptic fittings—for a fast and easy way to access your line. Clamps with wing nut tighten by hand.

304 stainless steel clamps have very good corrosion resistance.

Clamps that meet DIN 11864 or DIN 32676 adhere to international standards for sanitary quick-clamp fittings.

Clamps

304 Stainless Steel with Wing Nut

304 Stainless Steel with Wing Nut
For Tube OD	For Flange OD	Max. Pressure	Specifications Met		Each
81mm	106mm	30 psi @ 72° F	DIN 32676	0000000	000000

Gaskets and O-Rings

The temperature rating of the fitting will vary depending on the gasket or O-ring material you choose. EPDM resists water and steam and works well in humid environments.

Gaskets
For Tube OD	ID	OD	Thick.	Temp. Range, °F	Color	Specifications Met		Each
EPDM Rubber
81mm	81.200mm	106.000mm	0.205"	-50° to 275°	Black	DIN 32676	0000000	000000
Silicone Rubber
81mm	81.200mm	108.180mm	5.2mm	-40° to 450°	Clear	DIN 32676, FDA Compliant 21 CFR 177.2600	00000000	00000
PTFE Plastic
81mm	81.200mm	106.000mm	5.2mm	-100° to 500°	White	DIN 32676, FDA Compliant 21 CFR 177.1550	000000000	00000

Ultra-Chemical-Resistant PTFE Gaskets for Quick-Clamp Tube Fittings

Made of PTFE, these gaskets are chemically inert (except to molten alkali metal and elemental fluorine). They ensure a tight seal in quick-clamp stainless steel sanitary tube fittings.

Gaskets that meet DIN 32676 adhere to international standards for sanitary quick-clamp fittings.

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

For Tube OD	ID	OD	Thick.	Temperature Range, °F	Hardness	Hardness Rating	Color	Specifications Met		Each
81mm	81.20mm	106.00mm	5.2mm	-100° to 500°	Durometer 63D	Extra Hard	White	DIN 32676, FDA Compliant 21 CFR 177.1550	000000000	000000

Water- and Steam-Resistant EPDM Gaskets for Quick-Clamp Tube Fittings

When working in moist environments, these EPDM gaskets ensure a tight seal in quick-clamp stainless steel sanitary tube fittings.

Gaskets that meet DIN 32676 adhere to international standards for sanitary quick-clamp fittings.

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

For Tube OD	ID	OD	Thickness	Temperature Range, °F	Hardness	Hardness Rating	Color	Specifications Met		Each
81mm	81.20mm	106.00mm	0.205"	-50° to 275°	Durometer 70A	Hard	Black	DIN 32676	0000000	000000

High-Temperature Silicone Gaskets for Quick-Clamp Tube Fittings

Even as temperatures rise, these silicone gaskets ensure a tight seal in quick-clamp stainless steel sanitary tube fittings. They withstand temperatures up to 450° F. These gaskets also resist water and salts.

Gaskets that meet DIN 32676 adhere to international standards for sanitary quick-clamp fittings.

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

For Tube OD	ID	OD	Thick.	Temperature Range, °F	Hardness	Hardness Rating	Color	Specifications Met		Each
81mm	81.20mm	108.18mm	5.2mm	-40° to 450°	Durometer 75A	Hard	Clear	DIN 32676, FDA Compliant 21 CFR 177.2600	00000000	000000