Glass Tube Adapters | McMaster-Carr

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High-Vacuum Flange Size

Maximum Vacuum @ Temperature

15 in. Hg @ 72° F

1× 10^-8 Torr @ 72° F

Wall Thickness

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Maximum Temperature

Relative Vacuum Rating

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High

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

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158 Products

About Measuring Fittings

Measure the threaded ends of your fittings to identify their pipe size, thread size, schedule, and thread type. Then, find compatible components.

Quick-Connect High-Vacuum Fittings for Stainless Steel Tubing

Twist these fittings onto high-vacuum tubing to quickly make sealed, high-vacuum connections without the need for clamping, welding, or tools. To connect, insert your tubing into the fitting and twist the collar on the end of the fitting; an O-ring on the inside of the fitting compresses to form the seal. Also known as quick-disconnects, they're as easy to twist off as they are to twist on. Not for use in pressure applications.

Connectors have quick-connect fittings on both sides. Use them to connect two lengths of tubing: stainless steel to stainless steel, glass to glass, or go from one material to the other.

Adapters have a quick-connect fitting on one side and a quick-clamp fitting on the other. Use them to attach and remove components for one-off uses or to adapt your quick-clamp system to connect to glass tubing. Quick-clamp fittings are also known as KF, QF, and NW fittings; they require a clamp and ring (sold separately) to complete the connection.

Plugs fit inside the end of a quick-connect fitting to block it off when not in use.

Straight Connectors, Quick Connect

Connectors								Replacement O-Rings
For Tube OD	Wall Thick.	Max. Vacuum	Material	O-Ring Material	Temp. Range, °F		Each		Each
1/4"	0.117"	10 ^-8 torr @ 72° F	304 Stainless Steel	Buna-N Rubber	-40° to 250°	3486N11	0000000	3486N21	00000
1/2"	0.078"	10 ^-8 torr @ 72° F	304 Stainless Steel	Buna-N Rubber	-40° to 250°	3486N12	000000	3486N22	0000
3/4"	0.212"	10 ^-8 torr @ 72° F	304 Stainless Steel	Buna-N Rubber	-40° to 250°	3486N13	000000	3486N23	0000
1"	0.18"	10 ^-8 torr @ 72° F	304 Stainless Steel	Buna-N Rubber	-40° to 250°	3486N14	000000	3486N24	0000
1 1/2"	0.242"	10 ^-8 torr @ 72° F	304 Stainless Steel	Buna-N Rubber	-40° to 250°	3486N15	000000	3486N25	0000
2"	0.242"	10 ^-8 torr @ 72° F	304 Stainless Steel	Buna-N Rubber	-40° to 250°	3486N16	000000	3486N26	0000

Straight Adapters, Quick Connect × Quick Clamp

Adapters
	Quick Clamp Tube Connection												Replacement O-Rings
For Tube OD (Quick Connect)	For Tube OD	Flange OD	High-Vacuum Flange Size	High Vacuum Connection Type	Wall Thick.	Max. Vacuum	Material	O-Ring Material	Temp. Range, °F	Specifications Met		Each		Each
1/4"	3/4"	1.18"	16	ISO-KF	0.112"	10 ^-8 torr @ 72° F	304 Stainless Steel	Buna-N Rubber	-40° to 250°	ISO 2861	3486N31	0000000	3486N21	00000
1/2"	1"	1.575"	25	ISO-KF	0.117"	10 ^-8 torr @ 72° F	304 Stainless Steel	Buna-N Rubber	-40° to 250°	ISO 2861	3486N32	000000	3486N22	0000
3/4"	1"	1.575"	25	ISO-KF	0.055"	10 ^-8 torr @ 72° F	304 Stainless Steel	Buna-N Rubber	-40° to 250°	ISO 2861	3486N33	000000	3486N23	0000
1"	1"	1.575"	25	ISO-KF	0.055"	10 ^-8 torr @ 72° F	304 Stainless Steel	Buna-N Rubber	-40° to 250°	ISO 2861	3486N34	000000	3486N24	0000
1 1/2"	1 1/2"	2.165"	40	ISO-KF	0.118"	10 ^-8 torr @ 72° F	304 Stainless Steel	Buna-N Rubber	-40° to 250°	ISO 2861	3486N35	000000	3486N25	0000
2"	2"	2.953"	50	ISO-KF	0.118"	10 ^-8 torr @ 72° F	304 Stainless Steel	Buna-N Rubber	-40° to 250°	ISO 2861	3486N36	000000	3486N26	0000

Plugs

OD	Max. Vacuum	Material		Each
1/4"	10 ^-8 torr @ 72° F	304 Stainless Steel	3486N41	000000
1/2"	10 ^-8 torr @ 72° F	304 Stainless Steel	3486N42	00000
3/4"	10 ^-8 torr @ 72° F	304 Stainless Steel	3486N43	00000
1"	10 ^-8 torr @ 72° F	304 Stainless Steel	3486N44	00000
1 1/2"	10 ^-8 torr @ 72° F	304 Stainless Steel	3486N45	00000
2"	10 ^-8 torr @ 72° F	304 Stainless Steel	3486N46	00000

Clamps

with Wing Nut
For Tube OD	For Flange OD	For High-Vacuum Flange Size	High Vacuum Connection Type	Material	Nut Material	Max. Vacuum	Temp. Range, °F	Specifications Met		Each
1/2"; 3/4"	1.18"	10; 16	ISO-KF	Aluminum	Zinc Alloy	10 ^-8 torr @ 72° F	0° to 300°	ISO 2861	4518K711	00000
1"	1.57"	25	ISO-KF	Aluminum	Zinc Alloy	10 ^-8 torr @ 72° F	0° to 300°	ISO 2861	4518K72	00000
1 1/2"	2.16"	40	ISO-KF	Aluminum	Zinc Alloy	10 ^-8 torr @ 72° F	0° to 300°	ISO 2861	4518K73	00000
2"	2.95"	50	ISO-KF	Aluminum	Zinc Alloy	10 ^-8 torr @ 72° F	0° to 300°	ISO 2861	4518K74	00000

Rings

				Material
For Tube OD	For Flange OD	For High-Vacuum Flange Size	High Vacuum Connection Type	O-Ring	Inner Ring	Max. Vacuum	Temp. Range, °F	Specifications Met		Each
3/4"	1.18"	16	ISO-KF	Viton® Fluoroelastomer Rubber	304 Stainless Steel	10 ^-8 torr @ 72° F	0° to 300°	ISO 2861	4518K621	00000
1"	1.57"	25	ISO-KF	Viton® Fluoroelastomer Rubber	304 Stainless Steel	10 ^-8 torr @ 72° F	0° to 300°	ISO 2861	4518K63	00000
1 1/2"	2.16"	40	ISO-KF	Viton® Fluoroelastomer Rubber	304 Stainless Steel	10 ^-8 torr @ 72° F	0° to 300°	ISO 2861	4518K64	00000
2"	2.95"	50	ISO-KF	Viton® Fluoroelastomer Rubber	304 Stainless Steel	10 ^-8 torr @ 72° F	0° to 300°	ISO 2861	4518K65	00000

Vacuum Fittings for Steel Tubing

For Use With: Air, Glass, Plastic Pellets, Resins, Wood Chips
Temperature Range: -10° to 180° F
Tubing: Galvanized Steel: Use with steel, galvanized steel
Steel: Use with steel

Use these fittings to create an air vacuum system without the hassle of brazing and welding. Insert two fittings into a clamp (sold separately) and tighten to form a secure seal.

Galvanized steel fittings have fair corrosion resistance. Fittings without a finish should only be used in noncorrosive environments.

Straight Adapters, Tube × Male Threaded Pipe

				Galvanized Steel		Steel
For Tube OD	Pipe Size	Max. Pressure	Max. Vacuum		Each		Each
NPT Threads
2 1/8"	2	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K136	000000	5099K61	000000
2 1/2"	2 1/2	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K137	00000	5099K62	00000
3"	3	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K138	00000	5099K63	00000
3 1/2"	3 1/2	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K139	00000	5099K64	00000
4"	4	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K141	00000	5099K65	00000
5"	5	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K142	000000	5099K66	00000
6"	6	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K143	000000	5099K67	000000

Straight Adapters, Tube × Female Threaded Pipe

				Galvanized Steel		Steel
For Tube OD	Pipe Size	Max. Pressure	Max. Vacuum		Each		Each
NPT Threads
2 1/8"	2	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K144	000000	5099K71	000000
2 1/2"	2 1/2	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K145	00000	5099K72	00000
3"	3	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K146	00000	5099K73	00000
3 1/2"	3 1/2	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K147	000000	5099K74	000000
4"	4	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K148	000000	5099K75	00000
5"	5	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K149	000000	5099K76	000000
6"	6	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K151	000000	5099K77	000000

Straight Adapters with Cap, Tube × Male Threaded Pipe

Adapters with cap allow you to insert tubing to create a temporary connection.

NPT Threads
For Tube OD	Pipe Size	Material	Max. Pressure	Max. Vacuum		Each
1 1/2"	2	Zinc	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K152	000000
2"	2	Zinc	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K154	00000

Straight Reducers, Tube

				Galvanized Steel		Steel
For Tube OD (A)	For Tube OD (B)	Max. Pressure	Max. Vacuum		Each		Each
2 1/2"	2 1/8"	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K89	000000	5099K51	000000
3"	2 1/8"	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K98	00000	5099K52	00000
3 1/2"	2 1/8"	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K99	00000	5099K53	00000
3 1/2"	2 1/2"	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K132	00000	5099K54	00000
4"	2 1/8"	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K133	00000	5099K55	00000
5"	2 1/8"	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K134	000000	5099K56	000000
6"	2 1/8"	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K135	000000	5099K57	000000

90° Elbow Connectors, Tube

			Galvanized Steel		Steel
For Tube OD	Max. Pressure	Max. Vacuum		Each		Each
2 1/8"	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K12	000000	5099K11	000000
2 1/2"	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K28	00000	5099K12	00000
3"	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K29	00000	5099K13	00000
3 1/2"	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K34	00000	5099K14	00000
4"	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K36	00000	5099K15	00000
5"	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K37	000000	5099K16	00000
6"	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K39	000000	5099K17	000000

45° Elbow Connectors, Tube

			Galvanized Steel		Steel
For Tube OD	Max. Pressure	Max. Vacuum		Each		Each
2 1/8"	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K41	000000	5099K21	000000
2 1/2"	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K42	00000	5099K22	00000
3"	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K44	00000	5099K23	00000
3 1/2"	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K45	00000	5099K24	00000
4"	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K46	00000	5099K25	00000
5"	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K47	00000	5099K26	00000
6"	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K49	000000	5099K27	00000

Tee Connectors, Tube

			Galvanized Steel		Steel
For Tube OD	Max. Pressure	Max. Vacuum		Each		Each
2 1/8"	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K58	000000	5099K31	000000
2 1/2"	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K59	00000	5099K32	00000
3"	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K68	00000	5099K33	00000
3 1/2"	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K69	000000	5099K34	00000
4"	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K71	000000	5099K39	000000
5"	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K72	000000	5099K36	000000
6"	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K73	000000	5099K37	000000

45° Tee Connectors, Tube

			Galvanized Steel		Steel
For Tube OD	Max. Pressure	Max. Vacuum		Each		Each
2 1/8"	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K74	000000	5099K41	000000
2 1/2"	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K75	00000	5099K42	00000
3"	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K76	00000	5099K43	00000
3 1/2"	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K77	00000	5099K44	000000
4"	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K78	000000	5099K45	00000
5"	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K79	000000	5099K46	000000
6"	15 psi @ 72° F	15 in. of Hg @ 72° F	4935K88	000000	5099K47	000000

Clamps for Vacuum Fittings for Steel Tubing

Use these clamps to connect vacuum tube fittings. Insert two fittings into a clamp and tighten to form a secure seal.

Bolt Clamps

For Use With: Air, Glass, Plastic Pellets, Resins, Wood Chips
Temperature Range: Neoprene Rubber Gaskets: -20° to 190° F
Silicone Rubber Gaskets: -100° to 500° F
Tubing: Use with steel

Bolt clamps have a stainless steel strip that provides an escape route for electrostatic buildup when used in a fully-grounded system. They have fair corrosion resistance.

				Neoprene Rubber Gaskets		Silicone Rubber Gaskets
For Tube OD	Material	Max. Pressure	Max. Vacuum		Each		Each
1 1/2"	Galvanized Steel	15 psi @ 72° F	15 in. of Hg @ 72° F	4487K43	000000	4615K43	000000
1 3/4"	Galvanized Steel	15 psi @ 72° F	15 in. of Hg @ 72° F	4487K44	00000	4615K44	00000
2"	Galvanized Steel	15 psi @ 72° F	15 in. of Hg @ 72° F	4487K45	00000	4615K45	00000
2 1/8"	Galvanized Steel	15 psi @ 72° F	15 in. of Hg @ 72° F	4487K54	00000	4615K54	00000
2 1/4"	Galvanized Steel	15 psi @ 72° F	15 in. of Hg @ 72° F	4487K56	00000	4615K56	00000
2 1/2"	Galvanized Steel	15 psi @ 72° F	15 in. of Hg @ 72° F	4487K46	00000	4615K46	00000
3"	Galvanized Steel	15 psi @ 72° F	15 in. of Hg @ 72° F	4487K48	00000	4615K48	00000
5"	Galvanized Steel	15 psi @ 72° F	15 in. of Hg @ 72° F	4487K32	00000	4615K32	00000
6"	Galvanized Steel	15 psi @ 72° F	15 in. of Hg @ 72° F	4487K11	00000	4615K11	000000
8"	Galvanized Steel	15 psi @ 72° F	15 in. of Hg @ 72° F	4487K18	00000	4615K18	000000
10"	Galvanized Steel	15 psi @ 72° F	15 in. of Hg @ 72° F	4487K64	000000	4615K64	000000

Gravity-Flow Polypropylene Pipe Fittings for Corrosive Chemical Waste

For Use With: Deionized Water, Hydrochloric Acid, Oil, Phosphoric Acid, Salt Water, Solvents
Maximum Temperature: 220° F
Specifications Met: ASTM D4101, ASTM D635, ASTM F1412, UL 94 V-2
Compatible with Gravity-Flow Polypropylene Pipe for Corrosive Chemical Waste

Made of polypropylene, these gravity-flow fittings withstand organic solvents, such as acetone, that would dissolve CPVC pipe. They also stand up to highly corrosive acids, such as hydrochloric acid, and alkalies. All meet UL and ASTM standards for flame retardance and self-extinguishment in the case of fire. They also meet strict ASTM specifications and testing requirements for material quality and product dimensions. They’re compatible with Orion Blueline No-Hub and Orion Rionfuse chemical waste pipe and pipe fittings.

Adapters for glass pipe connect to older glass piping systems with a bead-to-bead clamp (not included).

Straight Adapters for Glass Pipe, Male Grooved End

Pipe Size	Lg.	Material	Color		Each
1 1/2	2 1/8"	Polypropylene Plastic	Blue	5377N102	0000000
2	2 5/8"	Polypropylene Plastic	Blue	5377N103	000000
3	3 47/64"	Polypropylene Plastic	Blue	5377N105	000000
4	4 49/64"	Polypropylene Plastic	Blue	5377N106	000000