1/2"-13 Weld Nuts | McMaster-Carr

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1008-1010 Low-Carbon Steel

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19 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



		1/2"-13	13/16"	3/8"	23/32"	0.063"	47/64"	ASME B1.1	25	000000000	000000


		18-8 Stainless Steel



				1/2"-13	13/16"	3/8"	23/32"	0.06"	47/64"	ASME B1.1	5	000000000	00000


				Grade 2 Titanium



						1/2"-13	13/16"	3/8"	23/32"	0.063"	23/32"	ASME B1.1	1	000000000	00000

Square Weld Nuts

With four symmetrical projections, these nuts create the strongest hold in our offering. Unlike rectangular weld nuts, each projection is equidistant from the threads, so welds wrap evenly for extra strength and twist resistance. Projections concentrate heat away from the threads to prevent them from deforming and create consistent welds. All nuts have a collar pilot that guides them into the hole, holds them in place while welding, and protects the threads from weld spatter.

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.	Specs. Met	Pkg. Qty.		Pkg.
Steel



		1/2"-13	13/16"	3/8"	23/32"	0.063"	47/64"	ASME B1.1	25	000000000	000000


		1/2"-13	13/16"	3/8"	23/32"	0.094"	47/64"	ASME B1.1	10	000000000	00000

Low-Profile Rectangular Weld Nuts

Weld permanent threads in channels and other tight spaces without adding a barrel bump that gets in the way. These nuts have a short barrel that tucks under low surfaces and a slim footprint that fits between narrow channel walls.

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.

Number of Projections—More projections lead to more consistent welds by concentrating heat and protecting the threads from deforming.

			Base			Barrel
	Thread Size	No. of Projections	Lg.	Wd.	Thk.	Dia.	Ht.	For Hole Dia.	Pkg. Qty.		Pkg.
Steel



		1/2"-13	0	1 1/2"	3/4"	3/16"	37/64"	3/32"	39/64"	10	000000000	000000


		1/2"-13	2	1 1/8"	3/4"	3/16"	37/64"	3/32"	19/32"	10	000000000	00000


		18-8 Stainless Steel



				1/2"-13	0	1 1/2"	51/64"	5/32"	19/32"	3/32"	39/64"	1	000000000	0000


				1/2"-13	2	1 1/8"	3/4"	5/32"	37/64"	3/32"	37/64"	5	000000000	00000

Long-Barrel Round Weld Nuts

With an extended barrel and a round flange, these nuts distribute force evenly to prevent pull-through. The barrel is twice as long as standard round weld nuts, so more threads connect with your bolt for a great grip. You can weld these nuts in two orientations: on top of a flat surface or with the barrel sticking through the hole.

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.

Zinc-Plated Steel—A step up from plain steel, these nuts withstand occasional exposure to moisture. Weld them to uncoated steel surfaces. If MIG or TIG welding, grind the zinc plating off the part of the nut you intend to weld.

Number of Projections—Weld these nuts on top of metal—the projections on the bottom will fuse to the surface. More projections lead to more consistent welds by concentrating heat and protecting the threads from deforming.

			Base		Barrel
	Thread Size	No. of Projections	Dia.	Thk.	Dia.	Ht.	Pkg. Qty.		Pkg.
Steel



		1/2"-13	0	1 1/4"	3/32"	19/32"	3/8"	10	000000000	000000


		1/2"-13	3	1 1/4"	3/32"	19/32"	3/8"	10	000000000	00000


		Zinc-Plated Steel



				1/2"-13	0	1 1/4"	3/32"	19/32"	3/8"	10	000000000	00000

Rectangular Weld Nuts

These nuts add permanent threads in narrow spaces such as channels. With a slim footprint, they fit where round weld nuts can’t. Plus, their barrel is twice as long as low-profile barrels, so more threads connect with your bolt for a secure hold. You can weld these nuts in two orientations: on top of a flat surface or with the barrel sticking through a hole.

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.

			Base			Barrel
	Thread Size	No. of Projections	Lg.	Wd.	Thk.	Dia.	Ht.	Pkg. Qty.		Pkg.
Steel



		1/2"-13	0	1 1/4"	3/4"	3/32"	19/32"	3/8"	25	000000000	000000


		Zinc-Plated Steel



				1/2"-13	0	1 1/4"	3/4"	3/32"	19/32"	3/8"	10	000000000	00000

Self-Aligning Rectangular Weld Nuts

Help screws pass through perfectly every time. These nuts float inside a rectangular retainer that shifts and tilts to compensate for misalignment. A pilot tip locates the hole, and the retainer holds the nut in place during welding.

Steel with Steel Retainer—Best for dry environments since moisture will create rust. Weld them to steel surfaces.

		Base
	Thread Size	Lg.	Wd.	Thk.	Ht.	Pkg. Qty.		Pkg.
Steel with Steel Retainer



		1/2"-13	2 1/4"	15/16"	1/16"	51/64"	5	000000000	000000

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



		1/2"-13	25/32"	23/64"	23/32"	0.06"	47/64"	50	000000000	000000


		1/2"-13	25/32"	23/64"	23/32"	0.085"	47/64"	50	000000000	00000

Screw-Mount Nuts


Style A	Style B

These screw-mount nuts have three mounting holes to accept screws and rivets. Insert the barrel through a hole or fasten the base with the barrel facing upward for use with thin materials. Since the base is flanged, it helps spread out the load. A larger base means more room for weight to spread. The longer the barrel, the more thread engagement with your screw.

Style B—Style B nuts can also be welded for a stronger, permanent hold. The three projections on their base concentrate your weld and create room for heat to dissipate, protecting threads from deforming.

			Base		Barrel
	Style	Thread Size	Dia.	Thk.	Dia.	Ht.	No. of Mounting Holes	Mounting Hole Dia.	No. of Projections	Pkg. Qty.		Pkg.
Steel



		A	1/2"-13	1 1/4"	3/32"	19/32"	3/8"	3	5/32"	—	10	000000000	000000


		B	1/2"-13	1 1/4"	3/32"	19/32"	3/8"	3	5/32"	3	10	000000000	00000