Hex Tee Nuts | McMaster-Carr

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73 Products

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Locknut

Distorted threads grip the screw for an extra-tight hold under vibration

22 products

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Corrosion Resistant

Won’t rust when exposed to moisture and chemicals

21 products

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4 products

Weld Nuts

Add permanent threads to thin metal with our go-to weld nuts. Unlike press-fit and rivet nuts, these nuts fuse to the base metal, so they won’t twist and pull out. Three evenly spaced projections concentrate heat away from the threads to prevent them from deforming and create consistent welds. All have a collar pilot that guides the nut into the hole, holds it in place while welding, and protects the threads from weld spatter. You can also install them on thick pieces of metal.

Steel—Best for dry environments since moisture will cause them to rust. Made of uncoated steel, these nuts require minimal prep. Weld them to uncoated steel surfaces.

18-8 Stainless Steel—Suitable for outdoor use, these nuts resist rust from water and mild chemicals. Weld them to stainless steel surfaces.

Grade 2 Titanium—The best choice when you need a high strength-to-weight ratio, these nuts are 40% lighter than steel nuts. They’re also our most corrosion-resistant weld nuts, standing up to salt water, strong acids, and other harsh chemicals. Weld them to titanium surfaces.

				Collar
	Thread Size	Wd.	Ht.	Dia.	Ht.	For Hole Dia.	Specs. Met	Pkg. Qty.		Pkg.
Steel



		8-32	1/2"	3/16"	13/32"	0.04"	27/64"	ASME B1.1	10	000000000	00000


		10-24	1/2"	3/16"	13/32"	0.04"	27/64"	ASME B1.1	25	000000000	00000
		10-32	1/2"	3/16"	13/32"	0.04"	27/64"	ASME B1.1	25	000000000	00000
		1/4"-20	1/2"	3/16"	13/32"	0.047"	27/64"	ASME B1.1	50	000000000	00000
		1/4"-20	1/2"	3/16"	13/32"	0.085"	27/64"	ASME B1.1	25	000000000	00000
		1/4"-28	1/2"	3/16"	13/32"	0.04"	27/64"	ASME B1.1	25	000000000	00000
		5/16"-18	9/16"	7/32"	15/32"	0.047"	31/64"	ASME B1.1	50	000000000	00000
		5/16"-18	9/16"	7/32"	15/32"	0.085"	31/64"	ASME B1.1	25	000000000	00000
		5/16"-24	9/16"	7/32"	15/32"	0.085"	31/64"	ASME B1.1	25	000000000	00000
		3/8"-16	5/8"	1/4"	17/32"	0.047"	35/64"	ASME B1.1	50	000000000	00000
		3/8"-16	5/8"	1/4"	17/32"	0.085"	35/64"	ASME B1.1	25	000000000	00000


		3/8"-24	5/8"	1/4"	17/32"	0.05"	35/64"	ASME B1.1	25	000000000	00000
		7/16"-14	3/4"	21/64"	21/32"	0.05"	43/64"	ASME B1.1	25	000000000	00000
		7/16"-14	3/4"	21/64"	21/32"	0.085"	43/64"	ASME B1.1	10	000000000	00000
		7/16"-20	3/4"	21/64"	21/32"	0.05"	43/64"	ASME B1.1	25	000000000	00000
		7/16"-20	3/4"	21/64"	21/32"	0.085"	43/64"	ASME B1.1	10	000000000	00000
		1/2"-13	13/16"	3/8"	23/32"	0.063"	47/64"	ASME B1.1	25	000000000	00000
		5/8"-11	15/16"	29/64"	25/32"	0.06"	51/64"	ASME B1.1	10	000000000	00000
		5/8"-11	15/16"	29/64"	25/32"	0.085"	51/64"	ASME B1.1	10	000000000	00000
		3/4"-10	1 15/64"	5/8"	31/32"	0.06"	63/64"	ASME B1.1	5	000000000	00000
		M3 × 0.5 mm	7.5 mm	2.45 mm	4.5 mm	0.55 mm	4.5 mm	DIN 929	100	000000000	00000


		M4 × 0.7 mm	9 mm	2.85 mm	6 mm	0.65 mm	6 mm	DIN 929	100	000000000	00000
		M5 × 0.8 mm	10 mm	3.3 mm	7 mm	0.7 mm	7 mm	DIN 929	100	000000000	00000
		M6 × 1 mm	11 mm	4.25 mm	8 mm	0.75 mm	8 mm	DIN 929	50	000000000	0000
		M8 × 1.25 mm	14 mm	5.6 mm	10.5 mm	0.9 mm	10.5 mm	DIN 929	50	000000000	00000
		M10 × 1.25 mm	17 mm	6.85 mm	12.5 mm	1.15 mm	12.5 mm	DIN 929	25	000000000	00000
		M10 × 1.5 mm	17 mm	6.85 mm	12.5 mm	1.15 mm	12.5 mm	DIN 929	25	000000000	00000
		M12 × 1.75 mm	19 mm	8.6 mm	14.8 mm	1.4 mm	14.8 mm	DIN 929	25	000000000	00000
		M14 × 2 mm	22 mm	9.2 mm	16.8 mm	1.8 mm	16.8 mm	DIN 929	10	000000000	0000
		M16 × 2 mm	24 mm	11.2 mm	18.8 mm	1.8 mm	18.8 mm	DIN 929	10	000000000	00000


		18-8 Stainless Steel



				1/4"-20	1/2"	3/16"	13/32"	0.047"	27/64"	ASME B1.1	10	000000000	0000


				1/4"-28	1/2"	3/16"	13/32"	0.04"	27/64"	ASME B1.1	10	000000000	0000
				5/16"-18	9/16"	7/32"	15/32"	0.047"	31/64"	ASME B1.1	5	000000000	0000
				3/8"-16	5/8"	1/4"	17/32"	0.047"	35/64"	ASME B1.1	5	000000000	0000
				1/2"-13	13/16"	3/8"	23/32"	0.06"	47/64"	ASME B1.1	5	000000000	00000
				M3 × 0.5 mm	7.5 mm	2.5 mm	4.5 mm	0.55 mm	4.5 mm	DIN 929	100	000000000	00000
				M4 × 0.7 mm	9 mm	2.9 mm	6 mm	0.65 mm	6 mm	DIN 929	50	000000000	0000
				M5 × 0.8 mm	10 mm	3.3 mm	7 mm	0.7 mm	7 mm	DIN 929	50	000000000	00000
				M6 × 1 mm	11 mm	4.3 mm	8 mm	0.75 mm	8 mm	DIN 929	25	000000000	0000
				M8 × 1.25 mm	14 mm	5.6 mm	10.5 mm	0.9 mm	10.5 mm	DIN 929	25	000000000	00000
				M10 × 1.5 mm	17 mm	6.9 mm	12.5 mm	1.15 mm	12.5 mm	DIN 929	10	000000000	0000


				M12 × 1.75 mm	19 mm	8.6 mm	14.8 mm	1.4 mm	14.8 mm	DIN 929	10	000000000	00000
				M16 × 2 mm	24 mm	11.2 mm	18.8 mm	1.8 mm	18.8 mm	DIN 929	1	000000000	00000


Grade 2 Titanium



				10-24	1/2"	3/16"	13/32"	0.04"	13/32"	ASME B1.1	1	000000000	00000


				1/4"-20	1/2"	3/16"	13/32"	0.047"	13/32"	ASME B1.1	1	000000000	00000
				5/16"-18	9/16"	7/32"	15/32"	0.047"	15/32"	ASME B1.1	1	000000000	00000
				3/8"-16	5/8"	1/4"	17/32"	0.047"	17/32"	ASME B1.1	1	000000000	00000
				1/2"-13	13/16"	3/8"	23/32"	0.063"	23/32"	ASME B1.1	1	000000000	00000
				M6 × 1 mm	11 mm	4.3 mm	8 mm	0.75 mm	8 mm	DIN 929	1	000000000	00000
				M8 × 1.25 mm	14 mm	5.6 mm	10.5 mm	0.9 mm	10.5 mm	DIN 929	1	000000000	00000
				M10 × 1.5 mm	17 mm	6.9 mm	12.5 mm	1.15 mm	12.5 mm	DIN 929	1	000000000	00000

Weld Locknuts

Prevent screws from backing out under heavy vibration. These nuts have distorted threads that grip screws tightly. Three evenly spaced projections concentrate heat away from the threads to prevent them from deforming and create consistent welds. These nuts also have a collar pilot that guides the nut into the hole, holds it in place while welding, and protects the threads from weld spatter.

Use Grade 2 or Class 6 screws to avoid stripping threads during installation. Distorted threads require high torque for fastening and unfastening, so you may need an impact wrench to remove screws.

Steel—Best for dry environments since moisture will cause them to rust. Made of uncoated steel, these nuts require minimal prep. Weld them to uncoated steel surfaces.

				Collar
	Thread Size	Wd.	Ht.	Dia.	Ht.	For Hole Dia.	Pkg. Qty.		Pkg.
Steel



		10-24	1/2"	3/16"	13/32"	0.04"	27/64"	10	000000000	00000


		10-32	1/2"	3/16"	13/32"	0.04"	27/64"	10	000000000	0000
		1/4"-20	15/32"	11/64"	13/32"	0.04"	27/64"	100	000000000	00000
		1/4"-20	1/2"	3/16"	13/32"	0.085"	27/64"	25	000000000	0000
		5/16"-18	35/64"	13/64"	15/32"	0.04"	31/64"	100	000000000	00000
		5/16"-18	9/16"	7/32"	15/32"	0.085"	31/64"	10	000000000	0000
		3/8"-16	39/64"	15/64"	17/32"	0.05"	35/64"	50	000000000	00000
		3/8"-16	5/8"	1/4"	17/32"	0.085"	35/64"	10	000000000	0000
		1/2"-13	25/32"	23/64"	23/32"	0.06"	47/64"	50	000000000	00000
		1/2"-13	25/32"	23/64"	23/32"	0.085"	47/64"	50	000000000	00000
		5/8"-11	59/64"	27/64"	25/32"	0.085"	51/64"	25	000000000	00000


		5/8"-11	15/16"	7/16"	25/32"	0.085"	51/64"	5	000000000	0000
		M5 × 0.8 mm	11 mm	5.5 mm	7.6 mm	0.9 mm	7.6 mm	10	000000000	0000
		M6 × 1 mm	12.7 mm	5.1 mm	8.8 mm	1 mm	8.8 mm	100	000000000	00000
		M6 × 1 mm	13 mm	5.5 mm	9.1 mm	1.6 mm	9.1 mm	25	000000000	0000
		M8 × 1.25 mm	14.7 mm	6.6 mm	10.9 mm	1 mm	10.9 mm	50	000000000	00000
		M8 × 1.25 mm	15 mm	7 mm	11.1 mm	1.8 mm	11.1 mm	10	000000000	0000
		M10 × 1.5 mm	17.7 mm	7.7 mm	13.4 mm	1.16 mm	13.4 mm	50	000000000	00000
		M10 × 1.5 mm	18 mm	8 mm	13.6 mm	1.8 mm	13.6 mm	10	000000000	0000
		M12 × 1.75 mm	20.6 mm	9.4 mm	15.9 mm	1.26 mm	15.9 mm	50	000000000	00000
		M12 × 1.75 mm	21 mm	9.7 mm	16.1 mm	1.8 mm	16.1 mm	10	000000000	0000


		M16 × 2 mm	26 mm	13 mm	20.6 mm	1.3 mm	20.6 mm	5	000000000	0000