UNC Tube Fittings | McMaster-Carr

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115 Products

Tube-Connecting Nuts

Create strong joints in metal and plastic round tubes. Clips on both ends grip the sides of the tube to hold the nut in place. A zinc plating provides corrosion resistance in wet environments.

	For OD	Thread Size	Lg.	Retaining Clip Material	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	0.53" to 0.54"	5/8"	1/4"-20	0.27"	Steel	5	94290A509	00000


	0.62" to 0.65"	3/4"	1/4"-20	0.23"	Steel	10	94290A510	0000
	0.62" to 0.65"	3/4"	5/16"-18	0.31"	Steel	10	94290A515	0000
	0.67" to 0.69"	3/4"	1/4"-20	0.23"	Steel	10	94290A620	00000
	0.75" to 0.77"	7/8"	1/4"-20	0.23"	Steel	10	94290A520	0000
	0.78" to 0.83"	1"	1/4"-20	0.23"	Steel	5	94290A630	0000
	0.87" to 0.9"	1"	1/4"-20	0.23"	Steel	10	94290A550	0000
	0.87" to 0.9"	1"	5/16"-18	0.32"	Steel	10	94290A555	0000
	0.87" to 0.9"	1"	3/8"-16	0.4"	Steel	5	94290A553	0000
	1" to 1.02"	1 1/8"	1/4"-20	0.22"	Steel	5	94290A557	0000
	1.12" to 1.15"	1 1/4"	1/4"-20	0.2"	Steel	10	94290A571	00000


	1.12" to 1.15"	1 1/4"	5/16"-18	0.4"	Steel	10	94290A573	00000
	1.12" to 1.15"	1 1/4"	3/8"-16	0.4"	Steel	5	94290A640	0000
	1.25" to 1.27"	1 3/8"	1/4"-20	0.27"	Steel	5	94290A581	0000
	1.25" to 1.27"	1 3/8"	5/16"-18	0.24"	Steel	5	94290A650	0000
	1.37" to 1.4"	1 1/2"	1/4"-20	0.27"	Steel	5	94290A591	0000
	1.37" to 1.4"	1 1/2"	5/16"-18	0.41"	Steel	5	94290A593	0000
	1.62" to 1.65"	1 3/4"	1/4"-20	0.25"	Steel	5	94290A600	0000
	1.62" to 1.65"	1 3/4"	5/16"-18	0.27"	Steel	5	94290A660	0000
	1.87" to 1.9"	2"	1/4"-20	0.22"	Steel	5	94290A610	00000
	1.87" to 1.9"	2"	5/16"-18	0.4"	Steel	1	94290A670	0000

Press-Fit Leveling Mount Inserts

Slip these inserts into tubular legs to quickly add threads for attaching leveling mounts. They’re often used in the legs of light equipment and furniture.

For Square Legs

Square inserts have flexible spring steel walls that grip the inside of the legs.

	For Leg						Thread
	Outer Lg.	Outer Wd.	Inner Lg.	Inner Wd.	Cap. per Mount	Overall Ht.	Size	Type	Dp.	Pkg. Qty.		Pkg.
Zinc-Plated Steel



		1"	1"	15/16"	15/16"	Not Rated	1 1/16"	1/4"-20	UNC	1/4"	4	2417T27	00000


		1"	1"	15/16"	15/16"	Not Rated	1 1/16"	5/16"-18	UNC	1/4"	4	2417T28	0000
		1"	1"	15/16"	15/16"	Not Rated	1 1/16"	3/8"-16	UNC	1/4"	4	2417T11	00000
		1 1/4"	1 1/4"	1 3/16"	1 3/16"	Not Rated	1 1/16"	1/4"-20	UNC	1/4"	4	2417T61	00000
		1 1/4"	1 1/4"	1 3/16"	1 3/16"	Not Rated	1 1/16"	5/16"-18	UNC	1/4"	4	2417T62	00000
		1 1/4"	1 1/4"	1 3/16"	1 3/16"	Not Rated	1 1/16"	3/8"-16	UNC	1/4"	4	2417T12	00000
		1 1/2"	1 1/2"	1 7/16"	1 7/16"	Not Rated	1 1/16"	3/8"-16	UNC	1/4"	4	2417T63	00000
		1 1/2"	1 1/2"	1 7/16"	1 7/16"	Not Rated	2 1/8"	1/2"-13	UNC	1/2"	1	2417T13	00000
		1 3/4"	1 3/4"	1 11/16"	1 11/16"	Not Rated	2 1/16"	1/2"-13	UNC	1/2"	1	2417T14	00000
		2"	2"	1 15/16"	1 15/16"	Not Rated	2 1/16"	1/2"-13	UNC	1/2"	1	2417T15	00000

For Round Legs

Image of Attribute. Front orientation. Contains Annotated.

Retaining clips hold the round inserts inside the legs.

	For Leg				Thread
	ID	OD	Cap. per Mount	Overall Ht.	Size	Type	Dp.	Pkg. Qty.		Pkg.
Zinc-Plated Steel



		11/16"	3/4"	Not Rated	5/8"	1/4"-20	UNC	3/8"	4	2417T26	000000


		11/16"	3/4"	Not Rated	5/8"	5/16"-18	UNC	3/8"	4	2417T29	00000
		15/16"	1"	Not Rated	9/16"	3/8"-16	UNC	3/8"	4	2417T18	00000
		15/16"	1"	Not Rated	5/8"	1/4"-20	UNC	3/8"	4	2417T16	00000
		15/16"	1"	Not Rated	5/8"	5/16"-18	UNC	3/8"	4	2417T17	00000
		1 3/16"	1 1/4"	Not Rated	5/8"	1/4"-20	UNC	3/8"	4	2417T19	00000
		1 3/16"	1 1/4"	Not Rated	5/8"	5/16"-18	UNC	3/8"	4	2417T21	00000
		1 3/16"	1 1/4"	Not Rated	5/8"	3/8"-16	UNC	3/8"	4	2417T22	00000
		1 7/16"	1 1/2"	Not Rated	5/8"	1/4"-20	UNC	3/8"	4	2417T23	00000
		1 7/16"	1 1/2"	Not Rated	5/8"	5/16"-18	UNC	3/8"	4	2417T24	00000
		1 7/16"	1 1/2"	Not Rated	5/8"	3/8"-16	UNC	3/8"	4	2417T25	00000


		1 15/16"	2"	Not Rated	3/8"	3/8"-16	UNC	3/8"	4	2417T32	00000
		1 15/16"	2"	Not Rated	5/8"	1/4"-20	UNC	3/8"	4	2417T31	00000
		2 7/16"	2 1/2"	Not Rated	5/8"	3/8"-16	UNC	3/8"	4	2417T33	00000

High-Capacity Press-Fit Leveling Mount Inserts

Rated for high load capacity, use these inserts to connect threaded leveling mounts to machinery, instrument bases, and conveyor equipment with tubular legs. These inserts have pass-through holes that are partially threaded at the base. Tap mounts into place with a rubber hammer.

For Square Legs

Shown with

Brass

Insert

Installed

Plastic—The economical choice. These inserts can handle more weight than inserts with brass threads, but may wear out more quickly if frequently adjusted.

Plastic with Brass Insert—Move equipment around your workspace and make frequent adjustments without worrying about stripping the brass threads.

	For Leg						Thread
	Outer Lg.	Outer Wd.	Inner Lg.	Inner Wd.	Cap. per Mount, lb.	Overall Ht.	Size	Type	Dp.	Temp., ° F		Each
Plastic



		1 1/2"	1 1/2"	1 1/4"	1 1/4"	3,500	1 3/4"	3/8"-16	UNC	1 1/4"	-20 to 170	6675N32	00000


		1 1/2"	1 1/2"	1 1/4"	1 1/4"	3,500	1 3/4"	1/2"-13	UNC	1 1/4"	-20 to 170	6675N42	0000
		1 1/2"	1 1/2"	1 1/4"	1 1/4"	3,500	1 3/4"	5/8"-11	UNC	1 1/4"	-20 to 170	6675N52	0000
		1 1/2"	1 1/2"	1 1/4"	1 1/4"	3,500	1 3/4"	3/4"-10	UNC	1 1/4"	-20 to 170	6675N62	0000
		1 1/2"	1 1/2"	1 3/8"	1 3/8"	3,500	1 3/4"	3/8"-16	UNC	1 1/4"	-20 to 170	6675N31	0000
		1 1/2"	1 1/2"	1 3/8"	1 3/8"	3,500	1 3/4"	1/2"-13	UNC	1 1/4"	-20 to 170	6675N41	0000
		1 1/2"	1 1/2"	1 3/8"	1 3/8"	3,500	1 3/4"	5/8"-11	UNC	1 1/4"	-20 to 170	6675N51	0000
		1 1/2"	1 1/2"	1 3/8"	1 3/8"	3,500	1 3/4"	3/4"-10	UNC	1 1/4"	-20 to 170	6675N61	0000
		2"	2"	1 3/4"	1 3/4"	3,500	2"	3/8"-16	UNC	1"	-20 to 170	6675N35	0000
		2"	2"	1 3/4"	1 3/4"	3,500	2"	1/2"-13	UNC	1"	-20 to 170	6675N45	0000
		2"	2"	1 3/4"	1 3/4"	3,500	2"	5/8"-11	UNC	1"	-20 to 170	6675N55	0000


		2"	2"	1 3/4"	1 3/4"	3,500	2"	3/4"-10	UNC	1"	-20 to 170	6675N65	0000
		2"	2"	1 7/8"	1 7/8"	3,500	2"	3/8"-16	UNC	1"	-20 to 170	6675N34	0000
		2"	2"	1 7/8"	1 7/8"	3,500	2"	1/2"-13	UNC	1"	-20 to 170	6675N44	0000
		2"	2"	1 7/8"	1 7/8"	3,500	2"	5/8"-11	UNC	1"	-20 to 170	6675N54	0000
		2"	2"	1 7/8"	1 7/8"	3,500	2"	3/4"-10	UNC	1"	-20 to 170	6675N64	0000


		Plastic with Brass Insert



				1"	1"	7/8"	7/8"	1,100	1 3/16"	3/8"-16	UNC	7/8"	30 to 195	60945K56	0000


				1"	1"	7/8"	7/8"	1,100	1 3/16"	1/2"-13	UNC	7/8"	30 to 195	60945K57	0000
				1 3/16"	1 3/16"	1 1/16"	1 1/16"	1,200	1 5/16"	3/8"-16	UNC	7/8"	30 to 195	60945K58	00000
				1 1/2"	1 1/2"	1 1/4"	1 1/4"	1,000	1 11/16"	3/8"-16	UNC	3/4"	30 to 195	60945K25	00000
				1 1/2"	1 1/2"	1 1/4"	1 1/4"	1,000	1 11/16"	1/2"-13	UNC	3/4"	30 to 195	60945K26	00000
				1 1/2"	1 1/2"	1 1/4"	1 1/4"	1,000	1 11/16"	5/8"-11	UNC	15/16"	30 to 195	60945K27	00000
				1 1/2"	1 1/2"	1 1/4"	1 1/4"	1,000	1 11/16"	3/4"-10	UNC	1 1/8"	30 to 195	60945K28	00000
				1 1/2"	1 1/2"	1 3/8"	1 3/8"	1,000	1 11/16"	3/8"-16	UNC	3/4"	30 to 195	60945K21	00000
				1 1/2"	1 1/2"	1 3/8"	1 3/8"	1,000	1 11/16"	1/2"-13	UNC	3/4"	30 to 195	60945K22	00000
				1 1/2"	1 1/2"	1 3/8"	1 3/8"	1,000	1 11/16"	5/8"-11	UNC	15/16"	30 to 195	60945K23	00000
				1 1/2"	1 1/2"	1 3/8"	1 3/8"	1,000	1 11/16"	3/4"-10	UNC	1 1/8"	30 to 195	60945K24	00000


				2"	2"	1 3/4"	1 3/4"	1,000	1 15/16"	3/8"-16	UNC	3/4"	30 to 195	60945K29	00000
				2"	2"	1 3/4"	1 3/4"	1,000	1 15/16"	1/2"-13	UNC	3/4"	30 to 195	60945K31	00000
				2"	2"	1 3/4"	1 3/4"	1,000	1 15/16"	5/8"-11	UNC	15/16"	30 to 195	60945K32	00000
				2"	2"	1 3/4"	1 3/4"	1,760	1 15/16"	3/4"-10	UNC	1 1/8"	30 to 195	60945K33	00000
				2"	2"	1 7/8"	1 7/8"	1,000	1 15/16"	3/8"-16	UNC	3/4"	30 to 195	60945K52	00000
				2"	2"	1 7/8"	1 7/8"	1,000	1 15/16"	1/2"-13	UNC	3/4"	30 to 195	60945K53	00000
				2"	2"	1 7/8"	1 7/8"	1,000	1 15/16"	5/8"-11	UNC	15/16"	30 to 195	60945K54	00000
				2"	2"	1 7/8"	1 7/8"	1,760	1 15/16"	3/4"-10	UNC	1 1/8"	30 to 195	60945K55	00000

For Rectangular Legs


Shown with Brass Insert Installed

Plastic with Brass Insert—Move equipment around your workspace and make frequent adjustments without worrying about stripping the brass threads.

	For Leg						Thread
	Outer Lg.	Outer Wd.	Inner Lg.	Inner Wd.	Cap. per Mount, lb.	Overall Ht.	Size	Type	Dp.	Temp., ° F		Each
Plastic with Brass Insert



		3"	2"	2 3/4"	1 3/4"	1,760	1 15/16"	5/8"-11	UNC	15/16"	30 to 195	60945K49	000000


		3"	2"	2 3/4"	1 3/4"	1,760	1 15/16"	3/4"-10	UNC	1 1/8"	30 to 195	60945K51	00000

For Round Legs


Shown with Brass Insert Installed

Plastic with Brass Insert—Move equipment around your workspace and make frequent adjustments without worrying about stripping the brass threads.

	For Leg				Thread
	ID	OD	Cap. per Mount, lb.	Overall Ht.	Size	Type	Dp.	Temp., ° F		Each
Plastic with Brass Insert



		1 3/8"	1 1/2"	1,000	1 11/16"	3/8"-16	UNC	3/4"	30 to 195	60945K13	000000


		1 3/8"	1 1/2"	1,000	1 11/16"	1/2"-13	UNC	3/4"	30 to 195	60945K14	00000
		1 3/8"	1 1/2"	1,000	1 11/16"	5/8"-11	UNC	15/16"	30 to 195	60945K15	00000
		1 3/8"	1 1/2"	1,000	1 11/16"	3/4"-10	UNC	1 1/8"	30 to 195	60945K42	00000
		1 9/16"	1 11/16"	1,000	1 11/16"	3/8"-16	UNC	7/8"	30 to 195	60945K84	00000
		1 9/16"	1 11/16"	1,000	1 11/16"	1/2"-13	UNC	7/8"	30 to 195	60945K85	00000
		1 9/16"	1 11/16"	1,000	1 11/16"	5/8"-11	UNC	7/8"	30 to 195	60945K86	00000
		1 11/16"	1 15/16"	1,000	1 15/16"	3/8"-16	UNC	3/4"	30 to 195	60945K65	00000
		1 11/16"	1 15/16"	1,000	1 15/16"	1/2"-13	UNC	3/4"	30 to 195	60945K66	00000
		1 11/16"	1 15/16"	1,000	1 15/16"	5/8"-11	UNC	15/16"	30 to 195	60945K67	00000
		1 11/16"	1 15/16"	1,760	1 15/16"	3/4"-10	UNC	1 1/8"	30 to 195	60945K68	00000


		1 11/16"	2"	2,000	1 15/16"	3/8"-16	UNC	1"	30 to 195	60945K411	0000
		1 11/16"	2"	2,000	1 15/16"	1/2"-13	UNC	1"	30 to 195	60945K412	0000
		1 7/8"	2"	2,000	1 15/16"	3/8"-16	UNC	1"	30 to 195	60945K413	0000
		1 7/8"	2"	2,000	1 15/16"	1/2"-13	UNC	1"	30 to 195	60945K414	0000
		1 7/8"	2"	2,000	1 15/16"	5/8"-11	UNC	1"	30 to 195	60945K415	0000
		1 15/16"	2"	1,000	1 15/16"	3/8"-16	UNC	3/4"	30 to 195	60945K16	00000
		1 15/16"	2"	1,000	1 15/16"	1/2"-13	UNC	3/4"	30 to 195	60945K17	00000
		1 15/16"	2"	1,000	1 15/16"	5/8"-11	UNC	15/16"	30 to 195	60945K46	00000
		1 15/16"	2"	1,760	1 15/16"	3/4"-10	UNC	1 1/8"	30 to 195	60945K48	00000
		2 1/4"	2 3/8"	1,700	1 15/16"	5/8"-11	UNC	1 1/2"	30 to 195	60945K88	00000

Weld-On Leveling Mount Inserts

Weld these inserts to the end of tubular legs to attach threaded leveling mounts and casters. They create a more secure connection than press-fit inserts.

For Square Legs

	For Leg				Thread
	Outer Lg.	Outer Wd.	Cap. per Mount	Ht.	Size	Type		Each
Steel



		1"	1"	Not Rated	1/4"	3/8"-16	UNC	8856N11	000000


		1"	1"	Not Rated	1/4"	1/2"-13	UNC	8856N14	00000
		1"	1"	Not Rated	1/4"	5/8"-11	UNC	8856N17	00000
		1"	1"	Not Rated	1/4"	3/4"-10	UNC	8856N21	00000
		1 1/2"	1 1/2"	Not Rated	1/4"	3/8"-16	UNC	8856N12	00000
		1 1/2"	1 1/2"	Not Rated	1/4"	1/2"-13	UNC	8856N15	00000
		1 1/2"	1 1/2"	Not Rated	1/4"	5/8"-11	UNC	8856N18	00000
		1 1/2"	1 1/2"	Not Rated	1/4"	3/4"-10	UNC	8856N22	00000
		2"	2"	Not Rated	1/4"	3/8"-16	UNC	8856N13	00000
		2"	2"	Not Rated	1/4"	1/2"-13	UNC	8856N16	00000
		2"	2"	Not Rated	1/4"	5/8"-11	UNC	8856N19	00000


		2"	2"	Not Rated	1/4"	3/4"-10	UNC	8856N23	00000