3/8"-24 Tee Nuts | McMaster-Carr

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Military Specification

MS21059L6

MS21060L6

Mounting Hole Diameter

0.13"

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Unified Standard Class 2B

Unified Standard Class 3B

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7/16"

0.453"

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31 Products

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—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.

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
Cadmium-Plated Carbon Steel—Lubricated



		3/8"-24	1 19/64"	43/64"	1/16"	0.453"	19/64"	2	0.13"	1"	MS21059L6	90857A112	000000


		A286 Stainless Steel—Lubricated



				3/8"-24	1 19/64"	43/64"	1/16"	0.453"	19/64"	2	0.13"	1"	MS21060L6	90857A125	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



		3/8"-24	2	63/64"	5/8"	9/64"	7/16"	3/32"	7/16"	10	92006A170	00000


		18-8 Stainless Steel



				3/8"-24	2	63/64"	5/8"	9/64"	7/16"	3/32"	7/16"	5	98697A790	0000

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



		3/8"-24	2"	25/32"	1/16"	33/64"	5	90955A120	000000

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.

Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.

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



		3/8"-24	5/8"	1/4"	17/32"	0.05"	35/64"	ASME B1.1	25	93560A250	000000

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



		3/8"-24	5/8"	1/4"	17/32"	0.063"	35/64"	ASME B1.1	50	93975A320	000000


		3/8"-24	5/8"	1/4"	17/32"	0.094"	35/64"	ASME B1.1	25	93975A118	00000

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.

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



		3/8"-24	0	1 1/8"	5/8"	9/64"	7/16"	3/32"	29/64"	25	94579A650	000000


		Zinc-Plated Steel



				3/8"-24	0	1 1/8"	5/8"	9/64"	7/16"	3/32"	29/64"	10	94579A830	0000


				18-8 Stainless Steel



						3/8"-24	0	1 1/8"	5/8"	9/64"	7/16"	3/32"	29/64"	5	94581A151	0000

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 5/8" OD Tubes

	0.058"	3/8"-24	1"	Partially Threaded	3/4"	94640A140	00000




			For 3/4" OD Tubes

			0.058"	3/8"-24	1"	Fully Threaded	1"	94640A190	0000


			0.065"	3/8"-24	1 3/8"	Partially Threaded	15/16"	94640A115	0000




					For 7/8" OD Tubes

					0.058"	3/8"-24	1 3/8"	Partially Threaded	15/16"	94640A150	0000


					0.065"	3/8"-24	1 3/8"	Partially Threaded	15/16"	94640A250	0000
					0.083"	3/8"-24	1 1/2"	Partially Threaded	15/16"	94640A310	0000




							For 1" OD Tubes

							0.058"	3/8"-24	1 1/2"	Partially Threaded	15/16"	94640A340	0000


							0.065"	3/8"-24	1 1/2"	Partially Threaded	15/16"	94640A380	0000
							0.083"	3/8"-24	1 1/2"	Partially Threaded	15/16"	94640A420	0000
							0.095"	3/8"-24	1 1/2"	Partially Threaded	15/16"	94640A440	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 5/8" OD Tubes

	0.058"	3/8"-24	1"	Partially Threaded	3/4"	94640A103	00000




			For 3/4" OD Tubes

			0.058"	3/8"-24	1"	Fully Threaded	1"	94640A106	0000


			0.065"	3/8"-24	1 3/8"	Partially Threaded	15/16"	94640A119	0000




					For 7/8" OD Tubes

					0.058"	3/8"-24	1 3/8"	Partially Threaded	1"	94640A154	0000


					0.065"	3/8"-24	1 3/8"	Partially Threaded	1"	94640A109	0000
					0.083"	3/8"-24	1 1/2"	Partially Threaded	1"	94640A203	0000




							For 1" OD Tubes

							0.058"	3/8"-24	1 1/2"	Partially Threaded	1"	94640A206	0000


							0.065"	3/8"-24	1 1/2"	Partially Threaded	1"	94640A208	0000
							0.083"	3/8"-24	1 1/2"	Partially Threaded	1"	94640A301	0000
							0.095"	3/8"-24	1 1/2"	Partially Threaded	1"	94640A303	0000