M20 Ball Screw Nuts | McMaster-Carr

Filter by

System of Measurement

Thread Size

Component

Travel Distance per Turn

Length

Nut Type

Diameter

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

Number of Thread Starts

Root Diameter

Thread Direction

Thread Type

Threading

Material

Number of Mounting Holes

Flange Width

60 mm

82 mm

Mounting Hole Thread Size

DFARS Specialty Metals

Exempt

Export Control Classification Number (ECCN)

REACH

RoHS

Maximum Temperature

Flange Thickness

Tensile Strength

Hardness

Maximum Backlash

14 Products

Selecting Compatible Lead 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

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