1/2"-10 Lead Screw Nuts | McMaster-Carr

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Selecting Compatible Lead Screws and Nuts

Pair with a motor in automated motion and positioning applications. A tight thread fit allows these lead screws and nuts to make accurate, repeatable starts and stops. 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, please select components that have the same thread direction, thread size, and number of thread starts.

Carbon steel lead screws and flanges have good machinability. Black-oxide alloy steel lead screws are hard and strong. They have mild corrosion resistance and a dark surface color. 303 and 304 stainless steel lead screws and flanges have good corrosion resistance.

932 bearing bronze and 673 bronze nuts are wear resistant. They have good machinability and fair corrosion resistance. Cast iron nuts have good machinability and high strength. 360 brass nuts have excellent machinability and good corrosion resistance. PET plastic nuts are lightweight and corrosion resistant. PEEK plastic nuts handle twice as much heat as PET and acetal plastic nuts. They have good chemical resistance and excellent corrosion resistance.

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

For technical drawings and 3-D models, click on a part number.

Platform Nuts—Right-Hand Threaded

Platform nuts have wide, machinable surfaces for custom mounting.

932 Bearing Bronze
Thread Size	Lg.	Wd.	Ht.	Center Ht.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness	Dynamic Thrust Load Cap., lbs.		Each
1/2"-10	1 3/4"	2"	1 1/8"	5/8"	1	1:1	0.1"	Class 2C	Brinell 65	1,200	000000	0000000

Platform Nuts—Left-Hand Threaded

Platform nuts have wide, machinable surfaces for custom mounting.

932 Bearing Bronze
Thread Size	Lg.	Wd.	Ht.	Center Ht.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness	Dynamic Thrust Load Cap., lbs.		Each
1/2"-10	1 3/4"	2"	1 1/8"	5/8"	1	1:1	0.1"	Class 2C	Brinell 65	1,200	0000000	0000000

Round Nuts—Right-Hand Threaded

Cast Iron
Thread Size	Lg.	Dia.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness	Dynamic Thrust Load Cap., lbs.	Temperature Range, °F		Each
1/2"-10	1"	1.469"	1	1:1	0.1"	Class 2C	Brinell 217	Not Rated	__	000000000	000000
932 Bearing Bronze
1/2"-10	1"	1.469"	1	1:1	0.1"	Class 2C	Brinell 65	1,300	__	00000000	00000
PET Plastic
1/2"-10	1"	1.469"	1	1:1	0.1"	Class 2C	Not Rated	650	15° to 175°	00000000	00000
PEEK Plastic
1/2"-10	1"	1.5"	1	1:1	0.1"	Class 2C	Not Rated	5,650	-40° to 525°	000000000	000000

Round Nuts—Left-Hand Threaded

Cast Iron
Thread Size	Lg.	Dia.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness	Dynamic Thrust Load Cap., lbs.	Temperature Range, °F		Each
1/2"-10	1"	1.469"	1	1:1	0.1"	Class 2C	Brinell 217	Not Rated	__	000000000	000000
932 Bearing Bronze
1/2"-10	1"	1.469"	1	1:1	0.1"	Class 2C	Brinell 65	1,300	__	00000000	00000
PET Plastic
1/2"-10	1"	1.469"	1	1:1	0.1"	Class 2C	Not Rated	650	15° to 175°	00000000	00000

Externally Threaded Nuts—Right-Hand Threaded

Combine externally threaded nuts with a flange to create a custom flange nut.

						External Thread
Thread Size	Lg.	Dia.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Size	Lg.	Thread Fit	Hardness	Dynamic Thrust Load Cap., lbs.	Temperature Range, °F		Each
360 Brass
1/2"-10	3/4"	1.125"	1	1:1	0.1"	15/16"-16	1/2"	Class 2C	Brinell 141	1,250	__	000000000	000000
673 Bronze
1/2"-10	3/4"	1.125"	1	1:1	0.1"	15/16"-16	1/2"	Class 2C	Brinell 70	Not Rated	__	000000000	00000
PET Plastic
1/2"-10	3/4"	1.125"	1	1:1	0.1"	15/16"-16	1/2"	Class 2C	Not Rated	650	15° to 175°	000000000	00000
PEEK Plastic
1/2"-10	3/4"	1.125"	1	1:1	0.1"	15/16"-16	1/2"	Class 2C	Not Rated	620	-40° to 525°	000000000	000000

Externally Threaded Nuts—Left-Hand Threaded

Combine externally threaded nuts with a flange to create a custom flange nut.

						External Thread
Thread Size	Lg.	Dia.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Size	Lg.	Thread Fit	Hardness	Dynamic Thrust Load Cap., lbs.		Each
673 Bronze
1/2"-10	3/4"	1.125"	1	1:1	0.1"	15/16"-16	1/2"	Class 2C	Brinell 70	Not Rated	000000000	000000

Flanges

Thread onto an externally threaded acme nut to create a custom flange nut.

Carbon steel flanges have good machinability. However, they will rust when exposed to moisture. Black-oxide carbon steel flanges have mild corrosion resistance in dry environments and a dark surface color. 303 stainless steel flanges have good corrosion resistance.

Black-Oxide 1117 Carbon Steel
Flange Thread Size	Flange Dia.	Flange Thick.	Bolt Circle Dia.	Flange Hardness		Each
15/16"-16	2 39/64"	17/32"	2 3/32"	Brinell 135	00000000	000000
1215 Carbon Steel
15/16"-16	2 5/8"	17/32"	2 3/32"	Not Rated	000000000	00000
303 Stainless Steel
15/16"-16	2 5/8"	17/32"	2 3/32"	Brinell 140	0000000	00000

Flange Nuts—Right-Hand Threaded

Flange nuts have wide, machinable surfaces for custom mounting.

			Flange
Thread Size	Lg.	Dia.	Dia.	Thick.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness	Tensile Strength, psi	Dynamic Thrust Load Cap., lbs.		Each
932 Bearing Bronze
1/2"-10	1 3/4"	1"	2"	3/8"	1	1:1	0.1"	Class 2C	Brinell 65	35,000	1,200	000000000	0000000

Fast-Travel Precision Acme Lead Screws and Nuts

Multiple thread channels (also known as thread starts) create faster linear travel than lead screws with a single thread start. The threads have a tight thread fit for accurate, repeatable starts and stops. Pair with a motor in automated motion and positioning applications. To ensure compatibility, please select components that have the same thread direction, thread size, and number of thread starts.

Carbon steel lead screws and flanges have good machinability. 303 and 304 stainless steel lead screws and flanges have good corrosion resistance.

Cast iron nuts have good machinability and high strength. 932 bearing bronze and 673 bronze nuts are wear resistant. They have good machinability and fair corrosion resistance. PET plastic nuts are lightweight and corrosion resistant.

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

For technical drawings and 3-D models, click on a part number.

Round Nuts—Right-Hand Threaded

Cast Iron
Thread Size	Lg.	Dia.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness	Dynamic Thrust Load Cap., lbs.	Temperature Range, °F		Each
1/2"-10	1"	1.469"	2	2:1	0.2"	Class 2C	Brinell 217	Not Rated	__	000000000	000000
1/2"-10	1"	1.469"	5	5:1	0.5"	Class 2C	Brinell 217	Not Rated	__	000000000	00000
932 Bearing Bronze
1/2"-10	1"	1.469"	2	2:1	0.2"	Class 2C	Brinell 65	1,300	__	0000000	00000
1/2"-10	1"	1.469"	5	5:1	0.5"	Class 2C	Brinell 65	1,300	__	00000000	00000
PET Plastic
1/2"-10	1"	1.469"	2	2:1	0.2"	Class 2C	Not Rated	650	15° to 175°	0000000	00000
1/2"-10	1"	1.469"	5	5:1	0.5"	Class 2C	Not Rated	650	15° to 175°	00000000	00000

Round Nuts—Left-Hand Threaded

932 Bearing Bronze
Thread Size	Lg.	Dia.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness	Dynamic Thrust Load Cap., lbs.		Each
1/2"-10	1"	1.469"	5	5:1	0.5"	Class 2C	Brinell 65	1,300	00000000	000000

Externally Threaded Nuts—Right-Hand Threaded

Combine externally threaded nuts with a flange to create a custom flange nut.

						External Thread
Thread Size	Lg.	Dia.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Size	Lg.	Thread Fit	Hardness	Dynamic Thrust Load Cap., lbs.	Temperature Range, °F		Each
673 Bronze
1/2"-10	3/4"	1.125"	2	2:1	0.2"	15/16"-16	1/2"	Class 2C	Brinell 70	Not Rated	__	000000000	000000
1/2"-10	3/4"	1.125"	5	5:1	0.5"	15/16"-16	1/2"	Class 2C	Brinell 70	Not Rated	__	000000000	00000
PET Plastic
1/2"-10	3/4"	1.125"	2	2:1	0.2"	15/16"-16	1/2"	Class 2C	Not Rated	650	15° to 175°	000000000	00000
1/2"-10	3/4"	1.125"	5	5:1	0.5"	15/16"-16	1/2"	Class 2C	Not Rated	650	15° to 175°	000000000	00000

Flanges

Thread onto an externally threaded acme nut to create a custom flange nut.

1215 Carbon Steel
Flange Thread Size	Flange Dia.	Flange Thick.	Bolt Circle Dia.	Flange Hardness		Each
15/16"-16	2 5/8"	17/32"	2 3/32"	Not Rated	000000000	000000
303 Stainless Steel
15/16"-16	2 5/8"	17/32"	2 3/32"	Brinell 140	0000000	00000

Ultra-Precision Lead Screws and Nuts

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.

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

For technical drawings and 3-D models, click on a part number.

Flange Nuts—Right-Hand Threaded

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.

				Flange
	Thread Size	Lg.	Dia.	Dia.	Thick.	No. of Thread Starts	Thread Type	Speed Ratio	Travel Distance per Turn	Bolt Circle Dia.	Tensile Strength, psi	Dynamic Thrust Load Cap., lbs.		Each
Acetal Plastic
B	1/2"-10	1 1/2"	0.75"	1 1/2"	3/16"	1	Rounded Acme	1:1	0.1"	1 1/8"	9,700	150	0000000	000000
Acetal Plastic with Wear-Compensating Spring
C	1/2"-10	2"	0.891"	1 39/64"	17/64"	1	Rounded Acme	1:1	0.1"	1 1/4"	9,700	25	0000000	00000

Fast-Travel Ultra-Precision Lead Screws and Nuts

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.

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

For technical drawings and 3-D models, click on a part number.

Flange Nuts—Right-Hand Threaded

				Flange
	Thread Size	Lg.	Dia.	Dia.	Thick.	No. of Thread Starts	Thread Type	Speed Ratio	Travel Distance per Turn	Bolt Circle Dia.	Tensile Strength, psi	Dynamic Thrust Load Cap., lbs.		Each
Acetal Plastic
B	1/2"-10	1 1/2"	0.75"	1 1/2"	3/16"	2	Rounded Acme	2:1	0.2"	1 1/8"	9,700	150	0000000	000000
Acetal Plastic with Wear-Compensating Spring
C	1/2"-10	2"	0.891"	1 39/64"	17/64"	2	Rounded Acme	2:1	0.2"	1 1/4"	9,700	25	0000000	00000

Acme Lead Screws and Nuts

Found in hand-powered clamps, vises, grates, doors, and work tables, lead screws and nuts have broad, square threads that are well suited for quick assembly, high clamping forces, and lifting and lowering heavy objects. To ensure compatibility, please select components that have the same thread direction, thread size, and number of thread starts.

Carbon steel components are easier to machine than alloy steel components. Zinc-plated carbon steel components have mild corrosion resistance. Cast iron components have good machinability and high strength. 360 brass components have excellent machinability and good corrosion resistance. 932 bearing bronze components are more wear resistant than brass components. They have good machinability and fair corrosion resistance. 18-8 stainless steel components have good corrosion resistance.

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

For technical drawings and 3-D models, click on a part number.

Coupling Nuts—Right-Hand Threaded

Coupling nuts connect two lead screws.

Carbon Steel
Thread Size	Ht.	Wd.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness		Each
1/2"-10	1 1/4"	5/8"	1	1:1	0.1"	Class 2G	Rockwell B75	000000000	000000
18-8 Stainless Steel
1/2"-10	1 1/4"	5/8"	1	1:1	0.1"	Class 2G	Not Rated	000000000	00000

Coupling Nuts—Left-Hand Threaded

Coupling nuts connect two lead screws.

Carbon Steel
Thread Size	Ht.	Wd.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness		Each
1/2"-10	1 1/4"	5/8"	1	1:1	0.1"	Class 2G	Rockwell B75	000000000	000000

Flange Nuts—Right-Hand Threaded

Flange nuts move objects along the length of a lead screw. Flange nuts have a wide machinable flange for custom mounting.

			Flange
Thread Size	Ht.	Dia.	Dia.	Thick.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness		Each
932 Bearing Bronze
1/2"-10	1"	3/4"	1 1/4"	1/8"	1	1:1	0.1"	Class 2G	Not Rated	000000000	0000000

Flange Nuts—Left-Hand Threaded

Flange nuts move objects along the length of a lead screw. Flange nuts have a wide machinable flange for custom mounting.

			Flange
Thread Size	Ht.	Dia.	Dia.	Thick.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness		Each
932 Bearing Bronze
1/2"-10	1"	3/4"	1 1/4"	1/8"	1	1:1	0.1"	Class 2G	Not Rated	000000000	0000000

Round Nuts—Right-Hand Threaded

Round nuts move objects along the length of a lead screw.

Cast Iron
Thread Size	Ht.	Dia.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness	Specifications Met		Each
1/2"-10	1"	1 15/32"	1	1:1	0.1"	Class 2G	Rockwell B96	__	000000000	000000
360 Brass
1/2"-10	1/2"	7/8"	1	1:1	0.1"	Class 2G	Rockwell B55	ASTM B16	000000000	0000
932 Bearing Bronze
1/2"-10	29/32"	29/32"	1	1:1	0.1"	Class 2G	Not Rated	ASTM B505	000000000	00000

Round Nuts—Left-Hand Threaded

Round nuts move objects along the length of a lead screw.

Cast Iron
Thread Size	Ht.	Dia.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness	Specifications Met		Each
1/2"-10	1"	1 15/32"	1	1:1	0.1"	Class 2G	Rockwell B96	__	000000000	000000
360 Brass
1/2"-10	1/2"	7/8"	1	1:1	0.1"	Class 2G	Rockwell B55	ASTM B16	000000000	0000
932 Bearing Bronze
1/2"-10	29/32"	29/32"	1	1:1	0.1"	Class 2G	Not Rated	ASTM B505	000000000	00000

Hex Nuts—Right-Hand Threaded

Hex nuts fasten and position lead screw components.

Carbon Steel
Thread Size	Ht.	Wd.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness	Specifications Met		Each
1/2"-10	31/64"	7/8"	1	1:1	0.1"	Class 2G	Rockwell B75	__	000000000	00000
Zinc-Plated Carbon Steel
1/2"-10	1/2"	7/8"	1	1:1	0.1"	Class 2G	Rockwell B75	__	000000000	00000
360 Brass
1/2"-10	1/2"	7/8"	1	1:1	0.1"	Class 2G	Rockwell B75	ASTM B16	000000000	0000
18-8 Stainless Steel
1/2"-10	31/64"	7/8"	1	1:1	0.1"	Class 2G	Not Rated	__	000000000	00000

Hex Nuts—Left-Hand Threaded

Hex nuts fasten and position lead screw components.

Carbon Steel
Thread Size	Ht.	Wd.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Fastener Strength Grade/Class	Hardness	Specifications Met		Each
1/2"-10	31/64"	7/8"	1	1:1	0.1"	Class 2G	Grade 2	Rockwell B85	__	000000000	00000
Zinc-Plated Carbon Steel
1/2"-10	1/2"	7/8"	1	1:1	0.1"	Class 2G	__	Rockwell B75	__	000000000	00000
360 Brass
1/2"-10	1/2"	7/8"	1	1:1	0.1"	Class 2G	__	Rockwell B75	ASTM B16	000000000	0000
18-8 Stainless Steel
1/2"-10	31/64"	7/8"	1	1:1	0.1"	Class 2G	__	Not Rated	__	000000000	00000

Square Nuts—Right-Hand Threaded

Square nuts fasten and position lead screw components. Square nuts have large sides, which make them easier to grip with a wrench than hex nuts and keep them from rotating in channels and square holes.

360 Brass
Thread Size	Ht.	Wd.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness	Specifications Met		Each
1/2"-10	1/2"	7/8"	1	1:1	0.1"	Class 2G	Rockwell B55	ASTM B16	000000000	00000

Square Nuts—Left-Hand Threaded

360 Brass
Thread Size	Ht.	Wd.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness	Specifications Met		Each
1/2"-10	1/2"	7/8"	1	1:1	0.1"	Class 2G	Rockwell B55	ASTM B16	000000000	000000

Thumb Nuts—Right-Handed Threaded

Thumb nuts fasten and position lead screw components. Thumb nuts are easy to grip and tighten by hand for quick assembly and disassembly.

Cast Iron
Thread Size	Ht.	Wd.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness		Each
1/2"-10	1 3/16"	2 3/4"	1	1:1	0.1"	Class 2G	Rockwell B97	000000000	00000