M20 Lead Screws | McMaster-Carr

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Thread Pitch

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Nut Type

Travel Distance per Turn

Material

Thread Direction

Thread Type

Metric Rounded Trapezoidal

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Number of Thread Starts

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Speed Ratio

Hardness

Thread Fit

Metric Trapezoidal Class 7e

Metric Trapezoidal Class 7H

Metric Trapezoidal Class 8e

Root Diameter

Flange Material

Tensile Strength

10,000 psi to 19,999 psi

20,000 psi to 39,999 psi

40,000 psi to 99,999 psi

100,000 psi or greater

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Dynamic Thrust Load Capacity

1,000 lb. to 1,999 lb.

2,000 lb. to 9,999 lb.

10,000 lb. to 19,999 lb.

20,000 lb. or greater

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34 Products

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, select components that have the same thread direction, size, pitch, and number of thread starts.

Lead screws are 1018 carbon steel for good machinability.

932 bearing bronze nuts have good machinability and wear resistance. Manganese bronze nuts have good strength and wear 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.

Lead Screws—Right-Hand Threaded

1018 Carbon Steel
Thread Size	Thread Pitch, mm	Lg., mm	No. of Thread Starts	Speed Ratio	Travel Distance per Turn, mm	Accuracy for Travel Distance per Turn	Thread Fit	Hardness	Tensile Strength, psi	Specifications Met		Each
M20	4	500	1	1:1	4	±0.15 mm per 300 mm	8e	Brinell 150	85,000	DIN 103	0000000	000000
M20	4	1,000	1	1:1	4	±0.15 mm per 300 mm	8e	Brinell 150	85,000	DIN 103	0000000	00000
M20	4	1,750	1	1:1	4	±0.15 mm per 300 mm	8e	Brinell 150	70,000	DIN 103	000000	000000

Round Nuts—Right-Hand Threaded

932 Bearing Bronze
Thread Size	Thread Pitch, mm	Lg.	Dia.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn, mm	Thread Fit	Hardness	Tensile Strength, psi	Dynamic Thrust Load Cap., lbs.	Specifications Met		Each
M20	4	1 1/2"	1.25"	1	1:1	4	7H	Brinell 70	Not Rated	3,100	DIN 103	0000000	000000

Externally Threaded Nuts—Right-Hand Threaded

							External Thread
Thread Size	Thread Pitch, mm	Lg.	Dia.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn, mm	Size	Lg.	Thread Fit	Hardness	Tensile Strength, psi	Dynamic Thrust Load Cap., lbs.	Specifications Met		Each
Manganese Bronze
M20	4	1 1/4"	1.125"	1	1:1	4	1"-18	1/2"	7H	Brinell 126	75,000	3,100	DIN 103	0000000	000000

Flange Nuts—Right-Hand Threaded

				Flange
Thread Size	Thread Pitch, mm	Lg.	Dia.	Dia.	Thick.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn, mm	Bolt Circle Dia.	Thread Fit	Hardness	Tensile Strength, psi	Dynamic Thrust Load Cap., lbs.	Specifications Met		Each
Manganese Bronze
M20	4	1 1/4"	1.125"	2 39/64"	17/32"	1	1:1	4	2 3/32"	7H	Brinell 126	Not Rated	3,100	DIN 103	0000000	000000

Metric 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 Metric Precision Acme Lead Screws and Nuts, these lead screws and nuts provide increased nut life and more reliable movement in automated systems. To ensure compatibility, select components that have the same thread size, thread pitch, and number of thread starts. 303 and 304 stainless steel lead screws have good corrosion resistance.

Acetal nuts have good wear and 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.

Lead Screws—Right-Hand Threaded

304 Stainless Steel
Thread Size	Thread Pitch, mm	Lg., mm	No. of Thread Starts	Thread Type	Speed Ratio	Travel Distance per Turn, mm	Accuracy for Travel Distance per Turn	Hardness	Tensile Strength, psi		Each
M20	5	500	4	Metric Rounded Trapezoidal	4:1	20	±0.1 mm per 300 mm	Brinell 160	72,000	0000000	0000000
M20	5	1,000	4	Metric Rounded Trapezoidal	4:1	20	±0.1 mm per 300 mm	Brinell 160	72,000	0000000	000000
M20	7.5	500	8	Metric Rounded Trapezoidal	8:1	60	±0.1 mm per 300 mm	Brinell 160	72,000	0000000	000000
M20	7.5	1,000	8	Metric Rounded Trapezoidal	8:1	60	±0.1 mm per 300 mm	Brinell 160	72,000	0000000	000000

Round Nuts—Right-Hand Threaded

Acetal Plastic
	Thread Size	Thread Pitch, mm	Lg.	Dia.	No. of Thread Starts	Thread Type	Speed Ratio	Travel Distance per Turn, mm	Hardness	Tensile Strength, psi	Dynamic Thrust Load Cap.		Each
A	M20	5	1 37/64"	1.772"	4	Metric Rounded Trapezoidal	4:1	20	Durometer 74D	10,000	Not Rated	0000000	000000
A	M20	7.5	1 37/64"	1.772"	8	Metric Rounded Trapezoidal	8:1	60	Durometer 74D	10,000	Not Rated	0000000	00000

Flange Nuts—Right-Hand Threaded

					Flange
	Thread Size	Thread Pitch, mm	Lg.	Dia.	Dia.	Thick.	No. of Thread Starts	Thread Type	Speed Ratio	Travel Distance per Turn, mm	Bolt Circle Dia.	Dynamic Thrust Load Cap., lbs.		Each
Acetal Plastic
F	M20	5	1 47/64"	1.26"	2 11/64"	15/32"	4	Metric Rounded Trapezoidal	4:1	20	1 49/64"	Not Rated	0000000	0000000
F	M20	7.5	1 47/64"	1.26"	2 11/64"	15/32"	8	Metric Rounded Trapezoidal	8:1	60	1 49/64"	Not Rated	0000000	000000

Metric 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, size, pitch, and number of thread starts. Class 7e and 7H components are compatible.

Black-oxide carbon steel components have mild corrosion resistance. 932 bearing bronze components are more wear resistant than brass components. They have good machinability and fair corrosion resistance. 360 brass components have excellent machinability and good 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.

Lead Screws—Right-Hand Threaded

Black-Oxide Carbon Steel
Thread Size	Thread Pitch, mm	Lg., mm	No. of Thread Starts	Speed Ratio	Travel Distance per Turn, mm	Thread Fit	Fastener Strength Grade/Class	Hardness	Specifications Met		Each
M20	4	1,000	1	1:1	4	7e	Grade 2	Not Rated	ASTM A108, ASTM A193, DIN 103	000000000	0000000
M20	4	2,000	1	1:1	4	7e	Grade 2	Rockwell B72	ASTM A108	000000000	000000

Flange Nuts—Right-Hand Threaded

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

				Flange
Thread Size	Thread Pitch, mm	Ht., mm	Dia., mm	Dia., mm	Thick., mm	No. of Thread Starts	Speed Ratio	Travel Distance per Turn, mm	Thread Fit	Hardness		Each
932 Bearing Bronze
M20	4	44	32	55	12	1	1:1	4	7H	Not Rated	000000000	000000

Hex Nuts—Right-Hand Threaded

Hex nuts fasten and position lead screw components.

Carbon Steel
Thread Size	Thread Pitch, mm	Ht., mm	Wd., mm	No. of Thread Starts	Speed Ratio	Travel Distance per Turn, mm	Thread Fit	Fastener Strength Grade/Class	Hardness		Each
M20	4	20	31.75	1	1:1	4	7H	Grade 2	Not Rated	000000000	000000

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	Thread Pitch, mm	Ht., mm	Wd., mm	No. of Thread Starts	Speed Ratio	Travel Distance per Turn, mm	Thread Fit	Hardness		Each
M20	4	50	38	1	1:1	4	7H	Not Rated	000000000	0000000

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.

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

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

Ball Screws—Right-Hand Threaded

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

Carbon Steel
Thread Size	Lg.	No. of Thread Starts	Travel Distance per Turn	Accuracy for Travel Distance per Turn	Root Dia.	Hardness	Tensile Strength, psi	Temp. Range, °F		Each
M20	500 mm	1	5mm	±0.210 mm per 300 mm	17.2mm	Rockwell C58	21,000	5° to 175°	0000000	0000000
M20	1,000 mm	1	5mm	±0.210 mm per 300 mm	17.2mm	Rockwell C58	21,000	5° to 175°	000000	000000
M20	1,500 mm	1	10mm	±0.210 mm per 300 mm	16.4mm	Rockwell C58	21,000	5° to 175°	000000	000000

Platform Ball Nuts—Right-Hand Threaded

Alloy Steel
Thread Size	Lg., mm	Wd., mm	Ht., mm	Center Ht., mm	No. of Thread Starts	Travel Distance per Turn, mm	Hardness	Dynamic Thrust Load Cap., lbs.	Max. Backlash, mm	Temp. Range, °F		Each
M20	35	48	39	17	1	5	Rockwell C58	1,300	0.1	5° to 175°	0000000	0000000
M20	58	48	46	18	1	10	Rockwell C58	2,350	0.1	5° to 175°	0000000	000000

Flange Ball Nuts—Right-Hand Threaded

				Flange
	Thread Size	Lg.	Dia.	Wd.	Ht.	Thick.	No. of Thread Starts	Travel Distance per Turn	Hardness	Dynamic Thrust Load Cap., lbs.	Max. Backlash		Each
Alloy Steel
C	M20	40mm	40mm	60mm	46mm	10mm	1	5mm	Rockwell C58	1,300	0.1mm	0000000	0000000
C	M20	64mm	52mm	82mm	64mm	12mm	1	10mm	Rockwell C58	2,350	0.1mm	0000000	000000

Fast-Travel Ball Screws and Nuts

Multiple thread channels (also known as thread starts) create faster linear travel than ball screws with a single thread start. Internal ball bearings provide smooth low-friction travel in applications that require high speeds, accurate positioning, and repeatable movement. To ensure compatibility, select components that have the same thread size and number of thread starts. 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.

Carbon steel ball screws and nuts are case hardened, so they resist wear better than standard carbon steel. However, they are less corrosion resistant than black-oxide alloy steel screws and nuts.

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

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

Ball Screws—Right-Hand Threaded

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

Carbon Steel
Thread Size	Lg.	No. of Thread Starts	Travel Distance per Turn	Accuracy for Travel Distance per Turn	Root Dia.	Hardness	Tensile Strength, psi	Temperature Range, °F		Each
M20	500mm	4	20mm	±0.05 mm per 300 mm	17mm	Rockwell C56	95,000	32° to 150°	00000000	0000000
M20	1,000mm	4	20mm	±0.05 mm per 300 mm	17mm	Rockwell C56	95,000	32° to 150°	00000000	000000

Flange Ball Nuts—Right-Hand Threaded

				Flange
	Thread Size	Lg.	Dia.	Dia.	Thick.	No. of Thread Starts	Travel Distance per Turn	Bolt Circle Dia.	Hardness	Dynamic Thrust Load Cap., lbs.	Max. Backlash	Temperature Range, °F		Each
Carbon Steel
E	M20	77mm	35mm	58mm	10mm	4	20mm	47mm	Rockwell C56	2,750	0.04mm	32° to 150°	00000000	0000000

Metric Clamping Lead Screw Collars

Thread these one-piece collars onto a metric lead screw to separate and position components, or use them as an end stop to limit travel. Made of black-oxide steel, they have mild corrosion resistance. Tighten the clamping screws to secure.

To ensure compatibility, please select a collar that has the same thread type, direction, size, pitch, and number of thread starts as your lead screw.

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

Right-Hand Threaded
Thread Size	Thread Pitch, mm	OD, mm	Wd., mm	No. of Thread Starts	Material	Hardness		Each
M20	4	40	15	1	Black-Oxide 1215 Carbon Steel	Brinell 167	0000000	000000

Roller Screws and Nuts

Precision ground to create more points of contact, these roller screws and nuts are highly accurate and handle much higher loads than ball screws and nuts of the same size. They're most traditionally used to replace hydraulics in linear actuators but can also be used in place of ball and lead screw assemblies because of their high load capacity and precise motion control. In fact, they're almost four times more accurate than our most accurate ball and lead screws. They also last longer than ball screw nuts in systems with lower loads and can handle higher shock loads. However, because they have more contact points, they’re slightly less efficient than ball screws. To ensure compatibility, select components that have the same thread direction and size.

Roller screws are made of hardened steel for strength and durability.

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

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

Roller Screws—Right-Hand Partially Threaded

Alloy Steel
Thread Size	Lg., mm	No. of Thread Starts	Travel Distance per Turn, mm	Accuracy for Travel Distance per Turn	Min. Thread Lg., mm	Root Dia., mm	Hardness	Tensile Strength, psi		Each
M20	680	5	4	±0.023 mm per 300 mm	561	19.15	Rockwell C60	105,000	0000000	000000000
M20	680	5	5	±0.023 mm per 300 mm	561	19.05	Rockwell C60	105,000	0000000	00000000

Round Nuts—Right-Hand Threaded

					Keyway
Thread Size	Lg., mm	Dia., mm	No. of Thread Starts	Travel Distance per Turn, mm	Wd., mm	Dp., mm	Hardness	Dynamic Thrust Load Cap., lbs.	Max. Backlash, mm	Temp. Range, °F	Lubrication		Each
Alloy Steel
M20	65	42	5	4	4	18	Rockwell C60	15,100	0.03	-40° to 350°	Required	0000000	000000000
M20	65	42	5	5	4	18	Rockwell C60	20,600	0.03	-40° to 350°	Required	0000000	00000000

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Selecting Compatible Lead Screws and Nuts

Metric Precision Lead Screws and Nuts

Metric Fast-Travel Ultra-Precision Lead Screws and Nuts

Metric Lead Screws and Nuts

Ball Screws and Nuts

Fast-Travel Ball Screws and Nuts

Metric Clamping Lead Screw Collars

Roller Screws and Nuts