McMaster-Carr

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, and pitch. 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.

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
M40	7	1,000	1	1:1	7	Class 7E	Grade 2	Not Rated	ASTM A108, ASTM A193, DIN 103	000000000	0000000
M40	7	2,000	1	1:1	7	Class 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
M40	7	66	63	98	16	1	1:1	7	Class 7H	Not Rated	000000000	0000000

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
M40	7	39.9	60.33	1	1:1	7	Class 7H	Grade 2	Not Rated	000000000	000000

Metric Precision Acme 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 size.

Lead screws are 1018 carbon steel for good machinability.

360 brass nuts have excellent machinability. 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
M40	7	1,000	1	1:1	7	±0.15 mm per 300 mm	Class 8E	Brinell 150	85,000	DIN 103	0000000	0000000
M40	7	1,750	1	1:1	7	±0.15 mm per 300 mm	Class 8E	Brinell 150	70,000	DIN 103	0000000	000000

Round Nuts—Right-Hand Threaded

360 Brass
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
M40	7	3"	2.5"	1	1:1	7	Class 8E	Brinell 70	Not Rated	12,300	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
M40	7	2 19/64"	2.125"	1	1:1	7	1 31/32"-18	13/16"	Class 8E	Brinell 126	75,000	12,300	DIN 103	0000000	0000000

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
360 Brass
M40	7	2 19/64"	2.125"	4 13/64"	53/64"	1	1:1	7	3 7/16"	Class 8E	Brinell 126	Not Rated	12,300	DIN 103	0000000	0000000

Metric 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, these 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 size and pitch. 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.

Flange Ball Nuts—Right-Hand Threaded

				Flange
Thread Size	Thread Pitch, mm	Lg., mm	Dia., mm	Dia., mm	Thick., mm	No. of Thread Starts	Travel Distance per Turn, mm	Hardness	Dynamic Thrust Load Cap., lbs.	Max. Backlash, mm	Includes	Temperature Range, °F		Each
Alloy Steel
M40	10	100	76	116	17	1	10	Rockwell C58	9,050	0.2	Seals	Not Rated° to 175°	00000000	0000000

Metric Fast-Travel Ball Screws and Nuts

With multiple thread starts, these metric ball screws create linear travel that’s approximately three times faster than ball screws with a single thread start. They’re ideal for applications with an actuator. The ball nuts have internal ball bearings to produce smooth, low-friction travel for applications that require high speed, accurate positioning, and repeatable movement. They come with a tube to keep the ball bearings in place. Do not remove the tube until you’re ready to install the nuts onto the screws. All of these ball nuts have an end cap on each end to stabilize fast-rotating motion. End caps also dampen the noise from the ball bearings and make the ball nuts more compact. Seals on the ball nuts keep out dust.

To ensure compatibility, select components that have the same thread size and pitch.

Ball nuts with four mounting holes have a lower profile than ball nuts with six mounting holes, so they’re better when assembly height clearance is tight.

Ball nuts with six mounting holes have a support bearing for greater axial rigidity than ball nuts with four mounting holes. They’re responsive to motor and actuator movements.

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

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.

Style A Flange Ball Nuts—Right-Hand Threaded

				Flange
Thread Size	Thread Pitch, mm	Lg., mm	Dia., mm	Wd., mm	Ht., mm	Thick., mm	No. of Thread Starts	Travel Distance per Turn, mm	No. of Mounting Holes	Hardness	Dynamic Thrust Load Cap., lbs.	Max. Backlash, mm	Includes	Temp. Range, °F		Each
Alloy Steel
M40	40	85	73	114	84	17	4	40	4	Rockwell C58	6,310	0.2	End Caps Seals	Not Rated to 175°	00000000	0000000
M40	40	85	73	114	84	17	4	40	4	Rockwell C58	11,400	0.2	End Caps Seals	Not Rated to 175°	00000000	000000

Style B Flange Ball Nuts—Right-Hand Threaded

				Flange
Thread Size	Thread Pitch, mm	Lg., mm	Dia., mm	Dia., mm	Thick., mm	No. of Thread Starts	Travel Distance per Turn, mm	No. of Mounting Holes	Bolt Circle Dia., mm	Hardness	Dynamic Thrust Load Cap., lbs.	Max. Backlash, mm	Includes	Temp. Range, °F		Each
Alloy Steel
M40	40	98	110	140	11	4	40	6	123	Rockwell C58	6,310	0.2	End Caps Seals	Not Rated to 175°	00000000	0000000

Terms and Conditions and Privacy Policy

Selecting Compatible Lead Screws and Nuts

Metric Acme Lead Screws and Nuts

Metric Precision Acme Lead Screws and Nuts

Metric Ball Screws and Nuts

Metric Fast-Travel Ball Screws and Nuts