Miniature Nuts | McMaster-Carr

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About Hex Nuts

Choose a hex nut with the right profile, material, and strength for your application.

Hex Nuts

The most commonly used hex nuts, these are suitable for fastening most machinery and equipment.

Low-Strength Steel

Rated Grade 2, Class 6, or lower, these nuts are about half as strong as medium-strength nuts. They are suitable for light duty fastening applications, such as securing access panels. Use them with screws that have a similar strength rating to avoid stripping threads during installation.

Zinc-Plated Steel—A step up from plain steel, the zinc plating withstands occasional exposure to moisture.

	Wd.	Ht.	Specs. Met	Pkg. Qty.		Pkg.
Zinc-Plated Steel



	0-80	5/32"	3/64"	ASME B18.2.2	100	000000000	00000


	1-64	5/32"	3/64"	ASME B18.2.2	50	000000000	0000
	1-72	5/32"	3/64"	ASME B18.2.2	100	000000000	0000

Corrosion-Resistant Stainless Steel

18-8 Stainless Steel—The choice for wet and outdoor environments, these nuts resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

Seize-Resistant Nitronic 60 Stainless Steel—With an inherently slippery surface, these nuts are less likely than 410 stainless steel nuts to stick and bind as you install them. Since they don't need coating or lubricant, they're often used in particle-free environments. They also stand up to salt water and mild chemicals, such as cleaners and degreasers.

	Wd.	Ht.	Specs. Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel



	0000-160	1/16"	1/32"	—	1	000000000	000000


	000-120	5/64"	1/32"	—	5	000000000	00000
	00-90	5/64"	3/64"	—	5	000000000	00000
	0-80	5/32"	3/64"	—	100	000000000	0000
	1-64	5/32"	3/64"	—	100	000000000	0000
	1-72	5/32"	3/64"	—	100	000000000	0000
	1/4"-20	7/16"	3/16"	—	100	000000000	0000
	1/4"-28	7/16"	3/16"	—	100	000000000	00000
	5/16"-18	9/16"	7/32"	—	50	000000000	0000
	3/8"-16	5/8"	1/4"	—	25	000000000	0000


	Seize-Resistant Nitronic 60 Stainless Steel



			1/4"-20	7/16"	7/32"	ASME B18.2.2	1	000000000	0000


			3/8"-16	9/16"	21/64"	ASME B18.2.2	1	000000000	0000
			1/2"-13	3/4"	7/16"	ASME B18.2.2	1	000000000	0000
			M6 × 1 mm	10 mm	5.2 mm	ISO 4032	1	000000000	0000
			M8 × 1.25 mm	13 mm	6.8 mm	ISO 4032	1	000000000	0000

Brass

Brass—Conductive and nonmagnetic, brass nuts are commonly used to secure electrical equipment, such as circuit board assemblies and mounting brackets, inside enclosures. They're also softer than most metals, so they won't damage other fastening components.

	Wd.	Ht.	Pkg. Qty.		Pkg.
Brass



	000-120	5/64"	1/32"	10	000000000	000000


	00-90	5/64"	3/64"	10	000000000	00000
	00-96	5/64"	3/64"	1	000000000	0000
	0-80	5/32"	3/64"	100	000000000	0000
	1-64	5/32"	3/64"	100	000000000	0000
	1-72	5/32"	3/64"	100	000000000	0000
	1/4"-20	7/16"	3/16"	50	000000000	00000

Narrow-Profile Hex Nuts

When you have limited space for tightening with a wrench, use these nuts. Since they’re about 20% narrower, they fit in tight spots where standard-profile nuts won't fit. Also known as small-pattern hex nuts.

Corrosion-Resistant Stainless Steel

18-8 Stainless Steel—The choice for wet and outdoor environments, these nuts resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

Black-Oxide 18-8 Stainless Steel—Typically chosen for their appearance, these nuts have a dark, matte coating to create a finished look. They resist rust in wet and outdoor environments, but won't hold up to the harsh chemicals that 316 stainless steel can.

	Wd.	Ht.	Pkg. Qty.		Pkg.
18-8 Stainless Steel



	0-80	1/8"	3/64"	50	000000000	00000


	1-64	1/8"	3/64"	50	000000000	0000
	1-72	7/64"	1/16"	5	000000000	00000


	Black-Oxide 18-8 Stainless Steel



			0-80	1/8"	3/64"	50	000000000	0000

Brass

	Wd.	Ht.	Pkg. Qty.		Pkg.
Brass



	0-80	3/32"	3/64"	10	000000000	000000


	1-72	7/64"	1/16"	10	000000000	00000

Press-Fit Nuts for Sheet Metal

Add permanent threads to thin panels in seconds. The knurls on these clinch-style nuts deform and grip sheet metal to create a permanent hold. Push them into a drilled or punched hole with an arbor press around your workpiece to install—no messy welding required.

18-8 Stainless Steel—The choice for wet and outdoor environments, these nuts resist rust and mild chemicals.

				Head
Thread Size	Drill Bit Size	For Min. Panel Thk.	For Maximum Panel Hardness	OD	Ht.	PEM® Part No.	Head Shape	Pkg. Qty.		Pkg.







			18-8 Stainless Steel

			0-80	35 Ga.	0.019"	Brinell 125, Rockwell B70	0.125"	0.05"	U-080-0	Round	5	000000000	00000


			1-64	35 Ga.	0.019"	Brinell 125, Rockwell B70	0.125"	0.05"	U-164-0	Round	5	000000000	0000
			2-56	27 Ga.	0.019"	Brinell 125, Rockwell B70	0.16"	0.065"	U-256-0	Round	5	000000000	0000
			2-56	27 Ga.	0.03"	Brinell 125, Rockwell B70	0.16"	0.065"	U-256-1	Round	5	000000000	0000
			4-40	11/64"	0.039"	Brinell 125, Rockwell B70	0.192"	0.065"	FEOX-440	Round	10	000000000	0000
			4-40	11/64"	0.059"	Brinell 125, Rockwell B70	0.192"	0.065"	FEX-440	Round	10	000000000	0000
			6-32	3 Ga.	0.039"	Brinell 125, Rockwell B70	0.244"	0.075"	FEOX-632	Round	10	000000000	0000
			6-32	3 Ga.	0.059"	Brinell 125, Rockwell B70	0.244"	0.075"	FEX-632	Round	10	000000000	0000
			8-32	L	0.039"	Brinell 125, Rockwell B70	0.322"	0.09"	FEOX-832	Round	10	000000000	0000
			8-32	L	0.059"	Brinell 125, Rockwell B70	0.322"	0.09"	FEX-832	Round	10	000000000	0000
			10-32	L	0.039"	Brinell 125, Rockwell B70	0.322"	0.11"	FEOX-032	Round	10	000000000	0000


			10-32	L	0.059"	Brinell 125, Rockwell B70	0.322"	0.11"	FEX-032	Round	10	000000000	0000
			1/4"-20	11/32"	0.059"	Brinell 125, Rockwell B70	0.384"	0.12"	FEX-0420	Round	5	000000000	0000
			1/4"-28	11/32"	0.059"	Brinell 125, Rockwell B70	0.384"	0.12"	FEX-0428	Round	5	000000000	0000
			M2 x 0.4 mm	27 Ga.	0.76 mm	Brinell 125, Rockwell B70	4.07 mm	1.65 mm	U-M2-1	Round	5	000000000	0000
			M3 x 0.5 mm	11/64"	0.99 mm	Brinell 125, Rockwell B70	4.88 mm	1.9 mm	FEOX-M3	Round	10	000000000	0000
			M3 x 0.5 mm	11/64"	1.5 mm	Brinell 125, Rockwell B70	4.88 mm	1.9 mm	FEX-M3	Round	10	000000000	0000
			M4 x 0.7 mm	L	0.99 mm	Brinell 125, Rockwell B70	8.17 mm	2.55 mm	FEOX-M4	Round	5	000000000	0000
			M4 x 0.7 mm	L	1.5 mm	Brinell 125, Rockwell B70	8.17 mm	2.55 mm	FEX-M4	Round	10	000000000	0000
			M5 x 0.8 mm	L	0.99 mm	Brinell 125, Rockwell B70	8.17 mm	3.05 mm	FEOX-M5	Round	5	000000000	0000
			M5 x 0.8 mm	L	1.5 mm	Brinell 125, Rockwell B70	8.17 mm	3.05 mm	FEX-M5	Round	10	000000000	0000


			M6 x 1 mm	11/32"	1.5 mm	Brinell 125, Rockwell B70	9.74 mm	3.3 mm	FEX-M6	Round	5	000000000	0000

Metric Ultra-Precision Lead Screws and Nuts


	Style A	Style B	Style C	Style D

Operating with less backlash (play) than Metric Precision Acme Lead Screws and Nuts, these provide increased nut life and more reliable movement in automated systems. Also known as single-start and self-locking lead screws and nuts, they have a single thread that runs the length of the screw. The nut travels only when the screw turns, so your system won't unexpectedly move when the lead screw is at rest. To ensure compatibility, select components that have the same thread size, thread type, thread size, thread pitch, and number of thread starts.

Externally Threaded Nuts—Right-Hand Thread


Style A	Style B

Acetal—Acetal nuts have good wear and corrosion resistance.

Travel Distance per Turn—Travel distance per turn, also known as screw lead, is the distance a nut moves with one revolution of the lead screw.

												External Thread
	Style	Thread Size	Lg.	Wd.	Ht.	Dia.	Hex Wd.	Thread Type	Speed Ratio	No. of Thread Starts	Travel Distance per Turn, mm	Size	Lg.	Hardness	Tensile Strength, psi	Dynamic Thrust Load Cap., lb.	Temp., ° F		Each
Acetal



		A	M2 × 0.5 mm	11/16"	—	—	0.297"	7/16"	Metric Rounded Trapezoidal	1:1	1	0.5	3/8"-24	3/16"	Not Rated	8,000	10	-40 to 185	0000000	000000


		A	M4 × 0.3 mm	11/16"	—	—	0.297"	7/16"	Metric Rounded Trapezoidal	1:1	1	0.3	3/8"-24	3/16"	Not Rated	8,000	25	-40 to 185	0000000	00000
		A	M8 × 1.5 mm	1"	—	—	0.548"	11/16"	Metric Rounded Trapezoidal	1:1	1	1.5	5/8"-18	1/4"	Not Rated	8,000	75	-40 to 185	0000000	00000


		PEEK



				B	M2 × 0.4 mm	5/16"	0.22"	0.197"	—	—	Metric Rounded Trapezoidal	1:1	1	0.375	M5 × 0.8 mm	9/64"	Durometer 83D	Not Rated	2	—	000000000	00000


				B	M3 × 0.5 mm	13/32"	0.311"	0.276"	—	—	Metric Rounded Trapezoidal	1:1	1	0.5	M7 × 0.75 mm	5/32"	Durometer 83D	Not Rated	5	—	000000000	00000
				B	M4 × 1 mm	1/2"	0.402"	0.354"	—	—	Metric Rounded Trapezoidal	1:1	1	1	M9 × 1 mm	13/64"	Durometer 83D	Not Rated	10	—	000000000	00000

Flange Nuts—Right-Hand Thread


Style C	Style D

Style C

Style D

Acetal—Acetal nuts have good wear and corrosion resistance.

Wear-Compensating Internal O-Ring—Flange nuts with wear-compensating internal O-ring maintain a tight fit even when their threads begin to wear. They resist backlash to maintain accuracy over time, which is important in positioning applications such as 3D printing and robotics.

Travel Distance per Turn—Travel distance per turn, also known as screw lead, is the distance a nut moves with one revolution of the lead screw.

					Flange
	Style	Thread Size	Lg.	Dia.	Dia.	Wd.	Ht.	Thk.	Thread Type	Speed Ratio	Bolt Circle Dia.	No. of Thread Starts	Travel Distance per Turn, mm	Hardness	Tensile Strength, psi	Dynamic Thrust Load Cap., lb.	No. of Mounting Holes	Temp., ° F		Each
Acetal



		C	M2 × 0.5 mm	1/2"	0.297"	—	3/4"	13/32"	1/8"	Metric Rounded Trapezoidal	1:1	39/64"	1	0.5	Not Rated	8,000	10	2	-40 to 185	0000000	000000


		C	M4 × 0.3 mm	1/2"	0.297"	—	3/4"	13/32"	1/8"	Metric Rounded Trapezoidal	1:1	39/64"	1	0.3	Not Rated	8,000	25	2	-40 to 185	0000000	00000
		D	M8 × 1.5 mm	3/4"	0.548"	1 1/8"	—	—	3/16"	Metric Rounded Trapezoidal	1:1	7/8"	1	1.5	Not Rated	8,000	75	3	-40 to 185	0000000	00000


		PEEK



				C	M2 × 0.4 mm	9/32"	0.209"	—	15/32"	15/64"	5/64"	Metric Rounded Trapezoidal	1:1	11/32"	1	0.375	Durometer 83D	Not Rated	2	2	—	000000000	00000


				C	M3 × 0.5 mm	21/64"	0.295"	—	39/64"	5/16"	3/32"	Metric Rounded Trapezoidal	1:1	15/32"	1	0.5	Durometer 83D	Not Rated	5	2	—	000000000	00000
				C	M4 × 1 mm	13/32"	0.354"	—	3/4"	13/32"	1/8"	Metric Rounded Trapezoidal	1:1	19/32"	1	1	Durometer 83D	Not Rated	10	2	—	000000000	00000


				PEEK with Wear-Compensating Internal O-Ring



						C	M2 × 0.4 mm	5/16"	0.228"	—	15/32"	15/64"	5/64"	Metric Rounded Trapezoidal	1:1	11/32"	1	0.375	Durometer 83D	Not Rated	1	2	—	000000000	000000


						C	M3 × 0.5 mm	25/64"	0.315"	—	39/64"	5/16"	3/32"	Metric Rounded Trapezoidal	1:1	15/32"	1	0.5	Durometer 83D	Not Rated	2	2	—	000000000	000000
						C	M4 × 1 mm	31/64"	0.406"	—	3/4"	13/32"	1/8"	Metric Rounded Trapezoidal	1:1	19/32"	1	1	Durometer 83D	Not Rated	5	2	—	000000000	000000

Mil. Spec. Hex Nuts

These nuts are manufactured and tested to strict U.S. military standards for material and construction.

Corrosion-Resistant Stainless Steel

Image of Product. Front orientation. Hex Nuts. Mil. Spec. Hex Nuts.

18-8 Stainless Steel—The choice for wet and outdoor environments, these nuts resist rust. However, they won't hold up to the harsh chemicals that 316 stainless steel can.

	Wd.	Ht.	Mil. Spec.	Specs. Met	Pkg. Qty.		Pkg.
18-8 Stainless Steel



	0-80	5/32"	3/64"	MS35650-314	Fed. Spec. FF-N-836, Fed. Spec. QQ-P-35	5	000000000	00000

Ball Screws and Nuts

Internal ball bearings provide smooth low-friction travel in applications that require high speeds, accurate positioning, and repeatable movement. Also known as single-start ball screws and nuts, they have a single thread that runs the length of the screw. They operate with more torque than fast-travel ball screws and nuts. To ensure compatibility, select components that have the same thread direction and size. Ball nuts are furnished with a tube to keep ball bearings in place. Do not remove the tube until you are ready to install the nuts onto the screws.

Ball Screws with Flange Ball Nut—Right-Hand Threaded

Root diameter indicates the diameter the ball screw will be after machining away the threads.

Travel Distance per Turn—Travel distance per turn, also known as screw lead, is the distance a ball nut moves with one revolution of the ball screw.

		Ball Screw			Flange Ball Nut, mm
	Thread Size	Lg., mm	Root Dia., mm	Tensile Strength, psi	Lg.	Dia.	Lg. Tolerance Type	No. of Thread Starts	Travel Distance per Turn, mm	Accuracy for Travel Distance per Turn	Hardness	Dynamic Thrust Load Cap., lb.	Max. Backlash, mm	Temp. Range, ° F		Each
Carbon Steel Ball Screw with Alloy Steel Flange Ball Nut



		M6	150	5.3	21,000	21	13	Plus	1	1	±0.210 mm/300 mm	Rockwell C58	150	0.05	5 to 175	0000000	0000000


		M6	250	5.3	21,000	21	13	Plus	1	1	±0.210 mm/300 mm	Rockwell C58	150	0.05	5 to 175	000000	000000
		M8	150	6.6	21,000	28	20	Plus	1	2	±0.210 mm/300 mm	Rockwell C58	470	0.05	5 to 175	0000000	000000
		M8	250	6.6	21,000	28	20	Plus	1	2	±0.210 mm/300 mm	Rockwell C58	470	0.05	5 to 175	000000	000000
		M10	200	8.6	21,000	28	23	Plus	1	2	±0.210 mm/300 mm	Rockwell C58	510	0.05	5 to 175	0000000	000000
		M10	300	8.6	21,000	28	23	Plus	1	2	±0.210 mm/300 mm	Rockwell C58	510	0.05	5 to 175	000000	000000
		M12	200	10.6	21,000	30	25	Plus	1	2	±0.210 mm/300 mm	Rockwell C58	560	0.05	5 to 175	000000	000000
		M12	300	10.6	21,000	30	25	Plus	1	2	±0.210 mm/300 mm	Rockwell C58	560	0.05	5 to 175	0000000	000000

Fast-Travel Ultra-Precision Lead Screws and Nuts


	Style A

Multiple thread channels (also known as thread starts) create faster linear travel than lead screws with a single thread start. Operating with less backlash (play) than Precision Acme Lead Screws and Nuts, these lead screws and nuts provide increased nut life and more reliable movement in automated systems. All components are corrosion resistant for use in harsh environments. To ensure compatibility, select components that have the same thread type, thread size, and number of thread starts.

Flange Nuts—Right-Hand Thread

Style A

Acetal—Acetal nuts have good wear and corrosion resistance.

Wear-Compensating Internal O-Ring—Flange nuts with wear-compensating internal O-ring or wear-compensating spring maintain a tight fit even when their threads begin to wear. They resist backlash to maintain accuracy over time, which is important in positioning applications such as 3D printing and robotics.

Travel Distance per Turn—Travel distance per turn, also known as screw lead, is the distance a nut moves with one revolution of the lead screw.

					Flange
	Style	Thread Size	Lg.	Dia.	Wd.	Ht.	Thk.	Thread Type	Speed Ratio	No. of Thread Starts	Travel Distance per Turn	Mounting Hole Ctr.-to-Ctr.	Hardness	Tensile Strength	Dynamic Thrust Load Cap., lb.	No. of Mounting Holes		Each
Acetal



		A	9/64"-20.8	1/2"	0.406"	3/4"	13/32"	1/8"	Rounded Acme	2:1	2	0.096"	39/64"	Not Rated	Not Rated	25	2	0000000	000000


		A	5/32"-21.3	1/2"	0.406"	3/4"	13/32"	1/8"	Rounded Acme	2:1	2	0.094"	39/64"	Not Rated	Not Rated	25	2	0000000	00000
		A	3/16"-42.7	1/2"	0.406"	3/4"	13/32"	1/8"	Rounded Acme	16:1	16	0.375"	39/64"	Not Rated	Not Rated	25	2	0000000	00000
		A	7/32"-20.8	1/2"	0.406"	3/4"	13/32"	1/8"	Rounded Acme	4:1	4	0.192"	39/64"	Not Rated	Not Rated	25	2	0000000	00000


		Acetal with Wear-Compensating Internal O-Ring



				A	9/64"-20.8	1/2"	0.406"	3/4"	13/32"	1/8"	Rounded Acme	2:1	2	0.096"	39/64"	Not Rated	Not Rated	5	2	0000000	00000


				A	5/32"-21.3	1/2"	0.406"	3/4"	13/32"	1/8"	Rounded Acme	2:1	2	0.094"	39/64"	Not Rated	Not Rated	5	2	0000000	00000
				A	3/16"-42.7	1/2"	0.406"	3/4"	13/32"	1/8"	Rounded Acme	16:1	16	0.375"	39/64"	Not Rated	Not Rated	5	2	0000000	00000
				A	7/32"-20.8	1/2"	0.406"	3/4"	13/32"	1/8"	Rounded Acme	4:1	4	0.192"	39/64"	Not Rated	Not Rated	5	2	0000000	00000

Ultra-Precision Lead Screws and Nuts


	Style A

Operating with less backlash (play) than Precision Acme Lead Screws and Nuts, these provide increased nut life and more reliable movement in automated systems. Also known as single-start and self-locking lead screws and nuts, they have a single thread that runs the length of the screw. The nut travels only when the screw turns, so your system won’t unexpectedly move when the lead screw is at rest. All components are corrosion resistant for use in harsh environments. To ensure compatibility, select components that have the same thread type, thread size, and number of thread starts.

Flange Nuts—Right-Hand Thread

Style A

Acetal—Acetal nuts have good wear and corrosion resistance.

Travel Distance per Turn—Travel distance per turn, also known as screw lead, is the distance a nut moves with one revolution of the lead screw.

					Flange
	Style	Thread Size	Lg.	Dia.	Wd.	Ht.	Thk.	Thread Type	Speed Ratio	No. of Thread Starts	Travel Distance per Turn	Mounting Hole Ctr.-to-Ctr.	Hardness	Tensile Strength	Dynamic Thrust Load Cap., lb.	No. of Mounting Holes		Each
Acetal



		A	9/64"-20.8	1/2"	0.406"	3/4"	13/32"	1/8"	Rounded Acme	1:1	1	0.048"	39/64"	Not Rated	Not Rated	25	2	0000000	000000


		A	9/64"-41.7	1/2"	0.406"	3/4"	13/32"	1/8"	Rounded Acme	1:1	1	0.024"	39/64"	Not Rated	Not Rated	25	2	0000000	00000
		A	7/32"-20.8	1/2"	0.406"	3/4"	13/32"	1/8"	Rounded Acme	1:1	1	0.048"	39/64"	Not Rated	Not Rated	25	2	0000000	00000


		Acetal with Wear-Compensating Internal O-Ring



				A	9/64"-20.8	1/2"	0.406"	3/4"	13/32"	1/8"	Rounded Acme	1:1	1	0.048"	39/64"	Not Rated	Not Rated	5	2	0000000	00000


				A	9/64"-41.7	1/2"	0.406"	3/4"	13/32"	1/8"	Rounded Acme	1:1	1	0.024"	39/64"	Not Rated	Not Rated	5	2	0000000	00000
				A	7/32"-20.8	1/2"	0.406"	3/4"	13/32"	1/8"	Rounded Acme	1:1	1	0.048"	39/64"	Not Rated	Not Rated	5	2	0000000	00000