1/4"-28 Tee Nuts | McMaster-Carr

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28 Products

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	Lg.	Wd.	Thk.	Dia.	Ht.	Pkg. Qty.		Pkg.
Steel



		1/4"-28	3/4"	1/2"	3/64"	5/16"	21/64"	50	000000000	000000

Stainless Steel Adhesive-Ready Nuts

Add strong threads to material that’s too difficult to drill or too thin to grip a threaded insert. These nuts are ideal for brittle plastics or tough composites, such as acrylic or carbon fiber. They have large holes in the base so that adhesive or resin can flow through, spread out, and create an extra-strong hold. You can also mold them into the surface of your material. Made of 316 stainless steel, they resist corrosion from salt water and harsh chemicals.

The base of these nuts acts like a flange, distributing pressure evenly across the mounting surface. The larger the base, the more that pressure is spread out; the smaller the base, the tighter the space these nuts can fit into. Taller nuts engage more of a screw’s threads than shorter nuts. Shorter nuts fit in low-clearance areas.

		Base		Nut
	Thread Size	Dia.	Thk.	Wd.	Ht.	Hole Dia.	Pkg. Qty.		Pkg.
316 Stainless Steel



		1/4"-28	29/32"	3/64"	3/8"	1/2"	13/64"	1	000000000	00000


		1/4"-28	29/32"	3/64"	7/16"	7/32"	13/64"	5	000000000	0000
		1/4"-28	1 1/2"	3/64"	3/8"	1/2"	11/64", 13/64"	1	000000000	0000
		1/4"-28	1 1/2"	3/64"	7/16"	7/32"	11/64", 13/64"	5	000000000	0000

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



		1/4"-28	2	13/16"	1/2"	1/8"	19/64"	1/16"	19/64"	10	000000000	00000


		18-8 Stainless Steel



				1/4"-28	2	13/16"	1/2"	1/8"	19/64"	1/16"	19/64"	10	000000000	00000

Mil. Spec. Rivet-Mount Nuts

Create threads in hard-to-work areas—where you can’t reach the back of a workpiece, or material is too thin to be tapped. For a strong grip, these rivet-mount nuts have distorted threads that increase friction with bolts. Because they mount with two rivets, they won’t spin when you’re tightening screws. However, these nuts do move inside their retainers, which lets you install bolts at a slight angle; use them to align with off-center parts. All meet military guidelines for dimensions and material.

A286 Stainless Steel—A286 stainless steel nuts are corrosion resistant.

Cadmium-Plated Carbon Steel and Cadmium-Plated Steel—Cadmium-plated nuts resist corrosion in industrial and saltwater environments, although will lose their corrosion resistance over 450° F. The cadmium plating also adds lubricity, making these nuts easy to install.

Silver-Plated A286 Stainless Steel—Silver-plated stainless steel nuts withstand temperatures up to 800° F. The silver plating also adds lubricity and prevents seizing caused by friction between nuts and bolts.

Lubricated—Lubricated nuts thread onto bolts smoothly.

		Base			Barrel		Mounting
	Thread Size	Lg.	Wd.	Thk.	Dia.	Ht.	No. of Holes	Hole Dia.	Hole Ctr.-to-Ctr.	Mil. Spec.		Each
Steel—Unlubricated



		1/4"-28	51/64"	1/2"	3/32"	0.313"	3/16"	2	0.098"	9/16"	MS21075-4N	000000000	00000


		Cadmium-Plated Steel—Lubricated



				1/4"-28	51/64"	1/2"	3/32"	0.313"	3/16"	2	0.098"	9/16"	MS21075L4N	000000000	0000


				Carbon Steel—Unlubricated



						1/4"-28	1 19/64"	33/64"	1/32"	0.313"	1/4"	2	0.098"	1"	MS21059-4	000000000	0000


						Cadmium-Plated Carbon Steel—Lubricated



								1/4"-28	1 19/64"	33/64"	1/32"	0.313"	1/4"	2	0.098"	1"	MS21059L4	000000000	0000


								A286 Stainless Steel—Lubricated



										1/4"-28	51/64"	1/2"	3/32"	0.313"	3/16"	2	0.098"	9/16"	MS21076L4N	000000000	0000


										1/4"-28	1 19/64"	33/64"	1/32"	0.313"	1/4"	2	0.098"	1"	MS21060L4	000000000	00000


										Silver-Plated A286 Stainless Steel—Unlubricated



												1/4"-28	51/64"	1/2"	3/32"	0.313"	3/16"	2	0.098"	9/16"	MS21076-4N	000000000	00000


												1/4"-28	1 19/64"	33/64"	1/32"	0.313"	1/4"	2	0.098"	1"	MS21060-4	000000000	00000

Stainless Steel Narrow-Base Adhesive-Ready Nuts

Add corrosion-resistant threads to channels, corners, and other tight spaces without drilling a hole. Glue these nuts on to thin surfaces and materials too hard and brittle to drill, such as acrylic and carbon fiber. Large holes in the base allow adhesive and resin to flow and spread along the joint for a good bond. You can mold them into plastics or composites. Made of 316 stainless steel, these nuts are excellent at resisting chemicals and salt water.

The base of these nuts acts like a flange, distributing pressure evenly across the mounting surface. Larger bases spread the pressure over more surface for a strong bond, while smaller bases fit better in tight spaces.

		Base			Nut
	Thread Size	Lg.	Wd.	Thk.	Wd.	Ht.	Hole Dia.	Pkg. Qty.		Pkg.
316 Stainless Steel



		1/4"-28	15/16"	29/64"	3/64"	7/16"	7/32"	13/64"	5	000000000	000000


		1/4"-28	1 1/2"	19/32"	3/64"	7/16"	7/32"	13/64"	5	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



		1/4"-28	1/2"	5/32"	13/32"	0.063"	27/64"	ASME B1.1	50	000000000	000000

Offset-Barrel Low-Profile Rectangular Weld Nuts

Add permanent threads on corners and near edges. With a slim base and a short, offset barrel, these weld nuts fit in tight spaces such as channels and low-clearance areas.

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.

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

		Base			Barrel
	Thread Size	Lg.	Wd.	Thk.	Dia.	Ht.	For Hole Dia.	Pkg. Qty.		Pkg.
Steel



		1/4"-28	13/16"	1/2"	1/8"	19/64"	1/16"	5/16"	25	000000000	00000


		Zinc-Plated Steel



				1/4"-28	13/16"	1/2"	1/8"	19/64"	1/16"	5/16"	10	000000000	0000


				18-8 Stainless Steel



						1/4"-28	13/16"	1/2"	1/8"	19/64"	1/16"	5/16"	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



		1/4"-28	1 3/4"	9/16"	1/16"	7/16"	10	000000000	000000

Tube End Weld Nuts

Weld these nuts into tube ends to attach threaded fittings such as rod ends. The welded connection is stronger than tapping a tube directly. These nuts are often used to link control arms and suspensions. Also known as tube adapters and weldable threaded tube ends.

	Threading	Thread Lg.		Each
4130 Alloy Steel







	For 1/2" OD Tubes

	0.058"	1/4"-28	1"	Fully Threaded	1"	000000000	00000

Steel Narrow-Base Adhesive-Ready Nuts

Fit these nuts into channels, corners, and other tight spaces to add strong threads without drilling a hole. They’re ideal for material that’s too thin or too hard and brittle to drill, such as acrylic and carbon fiber. For a strong hold, large holes in the base let adhesive and resin flow through and spread out. You can also mold these nuts into plastics or composites. Thanks to a zinc plating, they resist rusting in wet environments.

		Base			Nut
	Thread Size	Lg.	Wd.	Thk.	Wd.	Ht.	Hole Dia.	Pkg. Qty.		Pkg.
Zinc-Plated Steel



		1/4"-28	15/16"	29/64"	3/64"	7/16"	7/32"	13/64"	10	000000000	00000


		1/4"-28	1 1/2"	19/32"	3/64"	7/16"	7/32"	13/64"	5	000000000	0000

Left-Hand-Thread Tube End Weld Nuts

These weld nuts prevent fasteners from backing out of assemblies that rotate counterclockwise. Their left-hand threads pair with left-hand screws and rods to stop the fastener from loosening as the assembly turns. Weld them to the end of a tube for a stronger connection than tapping the tube directly. Also known as tube adapters and weldable threaded tube ends.

	Threading	Thread Lg.		Each
4130 Alloy Steel







	For 1/2" OD Tubes

	0.058"	1/4"-28	1"	Fully Threaded	1"	000000000	00000

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.

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



		1/4"-28	1/2"	3/16"	13/32"	0.04"	27/64"	ASME B1.1	25	000000000	000000


		18-8 Stainless Steel



				1/4"-28	1/2"	3/16"	13/32"	0.04"	27/64"	ASME B1.1	10	000000000	0000