Metric Ball Screw Nuts | McMaster-Carr

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64 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 with Flange Ball Nut—Right-Hand Threaded

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

	Ball Screw			Flange Ball Nut
Thread Size	Lg., mm	Root Dia., mm	Tensile Strength, psi	Lg., mm	Dia., mm	Length Tolerance	No. of Thread Starts	Travel Distance per Turn, mm	Accuracy for Travel Distance per Turn	Hardness	Dynamic Thrust Load Capacity, lbs.	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 per 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 per 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 per 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 per 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 per 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 per 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 per 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 per 300 mm	Rockwell C58	560	0.05	5° to 175°	0000000	000000

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
M14	500 mm	1	4mm	±0.210 mm per 300 mm	11.5mm	Rockwell C58	21,000	5° to 175°	0000000	000000
M14	1,000 mm	1	4mm	±0.210 mm per 300 mm	11.5mm	Rockwell C58	21,000	5° to 175°	0000000	000000
M16	500 mm	1	5mm	±0.210 mm per 300 mm	13.5mm	Rockwell C58	21,000	5° to 175°	0000000	000000
M16	1,000 mm	1	5mm	±0.210 mm per 300 mm	13.5mm	Rockwell C58	21,000	5° to 175°	000000	000000
M20	500 mm	1	5mm	±0.210 mm per 300 mm	17.2mm	Rockwell C58	21,000	5° to 175°	0000000	000000
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
M25	500 mm	1	5mm	±0.210 mm per 300 mm	22.2mm	Rockwell C58	21,000	5° to 175°	0000000	000000
M25	1,000 mm	1	5mm	±0.210 mm per 300 mm	22.2mm	Rockwell C58	21,000	5° to 175°	0000000	000000
M25	1,500 mm	1	10mm	±0.210 mm per 300 mm	20.2mm	Rockwell C58	21,000	5° to 175°	0000000	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
M14	35	34	30	13	1	4	Rockwell C58	1,200	0.1	5° to 175°	0000000	0000000
M16	36	42	32.5	16	1	5	Rockwell C58	1,200	0.1	5° to 175°	0000000	000000
M20	35	48	39	17	1	5	Rockwell C58	1,300	0.1	5° to 175°	0000000	000000
M20	58	48	46	18	1	10	Rockwell C58	2,350	0.1	5° to 175°	0000000	000000
M25	35	60	45	20	1	5	Rockwell C58	1,500	0.1	5° to 175°	0000000	000000
M25	94	60	55	23	1	10	Rockwell C58	7,000	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	M14	40mm	31mm	50mm	37mm	10mm	1	4mm	Rockwell C58	1,200	0.1mm	0000000	0000000
C	M16	40mm	34mm	54mm	40mm	10mm	1	5mm	Rockwell C58	1,200	0.1mm	0000000	000000
C	M20	40mm	40mm	60mm	46mm	10mm	1	5mm	Rockwell C58	1,300	0.1mm	0000000	000000
C	M20	64mm	52mm	82mm	64mm	12mm	1	10mm	Rockwell C58	2,350	0.1mm	0000000	000000
C	M25	40mm	43mm	67mm	50mm	10mm	1	5mm	Rockwell C58	1,500	0.1mm	0000000	000000
C	M25	98mm	60mm	96mm	72mm	15mm	1	10mm	Rockwell C58	7,000	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
M12	500mm	2	10mm	±0.05 mm per 300 mm	9.6mm	Rockwell C56	95,000	32° to 150°	00000000	0000000
M12	1,000mm	2	10mm	±0.05 mm per 300 mm	9.6mm	Rockwell C56	95,000	32° to 150°	00000000	000000
M15	500mm	4	16mm	±0.05 mm per 300 mm	12.9mm	Rockwell C56	95,000	32° to 150°	00000000	00000
M15	500mm	4	20mm	±0.05 mm per 300 mm	12.3mm	Rockwell C56	95,000	32° to 150°	00000000	00000
M15	1,000mm	4	16mm	±0.05 mm per 300 mm	12.9mm	Rockwell C56	95,000	32° to 150°	00000000	000000
M15	1,000mm	4	20mm	±0.05 mm per 300 mm	12.3mm	Rockwell C56	95,000	32° to 150°	00000000	000000
M16	500mm	4	16mm	±0.05 mm per 300 mm	13.3mm	Rockwell C56	95,000	32° to 150°	00000000	00000
M16	1,000mm	4	16mm	±0.05 mm per 300 mm	13.3mm	Rockwell C56	95,000	32° to 150°	00000000	000000
M20	500mm	4	20mm	±0.05 mm per 300 mm	17mm	Rockwell C56	95,000	32° to 150°	00000000	000000
M20	1,000mm	4	20mm	±0.05 mm per 300 mm	17mm	Rockwell C56	95,000	32° to 150°	00000000	000000
M32	500mm	2	20mm	±0.05 mm per 300 mm	28.5mm	Rockwell C56	95,000	32° to 150°	00000000	000000
M32	500mm	4	32mm	±0.05 mm per 300 mm	28.3mm	Rockwell C56	95,000	32° to 150°	00000000	000000
M32	1,000mm	2	20mm	±0.05 mm per 300 mm	28.5mm	Rockwell C56	95,000	32° to 150°	00000000	000000
M32	1,000mm	4	32mm	±0.05 mm per 300 mm	28.3mm	Rockwell C56	95,000	32° to 150°	00000000	000000
M40	500mm	4	40mm	±0.05 mm per 300 mm	35.4mm	Rockwell C56	95,000	32° to 150°	00000000	000000
M40	1,000mm	4	40mm	±0.05 mm per 300 mm	35.4mm	Rockwell C56	95,000	32° to 150°	00000000	000000

Externally Threaded Ball Nuts—Right-Hand Threaded

Carbon Steel
	Thread Size	Lg.	Dia.	No. of Thread Starts	Travel Distance per Turn	External Thread Size	Hardness	Dynamic Thrust Load Cap., lbs.	Max. Backlash	Temperature Range, °F		Each
A	M12	50mm	30mm	1	10mm	M25	Rockwell C56	1,000	0.02mm	32° to 150°	00000000	0000000
B	M16	50mm	39mm	4	16mm	M30	Rockwell C56	1,500	0.04mm	32° to 150°	00000000	000000
C	M32	90mm	53mm	4	32mm	M50	Rockwell C56	3,700	0.03mm	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	M12	43mm	23mm	40mm	10mm	2	10mm	32mm	Rockwell C56	1,100	0.02mm	32° to 150°	00000000	0000000
E	M15	56mm	33mm	57mm	10mm	4	20mm	45mm	Rockwell C56	2,250	0.04mm	32° to 150°	00000000	000000
E	M15	61mm	27mm	48mm	10mm	4	16mm	38mm	Rockwell C56	2,200	0.04mm	32° to 150°	00000000	000000
E	M20	77mm	35mm	58mm	10mm	4	20mm	47mm	Rockwell C56	2,750	0.04mm	32° to 150°	00000000	000000
E	M32	88mm	53mm	86mm	14mm	4	32mm	71mm	Rockwell C56	5,800	0.05mm	32° to 150°	00000000	000000
E	M32	108mm	49mm	80mm	16mm	2	20mm	65mm	Rockwell C56	4,900	0.04mm	32° to 150°	00000000	000000
E	M40	101mm	66mm	106mm	18mm	4	40mm	85mm	Rockwell C56	9,550	0.07mm	32° to 150°	00000000	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
M15	642	5	4	±0.023 mm per 300 mm	522	14.59	Rockwell C60	105,000	0000000	000000000
M15	642	5	5	±0.023 mm per 300 mm	522	14.44	Rockwell C60	105,000	0000000	00000000
M20	680	5	4	±0.023 mm per 300 mm	561	19.15	Rockwell C60	105,000	0000000	00000000
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
M15	45	35	5	4	4	14	Rockwell C60	9,230	0.03	-40° to 350°	Required	0000000	000000000
M15	45	35	5	5	4	14	Rockwell C60	12,000	0.03	-40° to 350°	Required	0000000	00000000
M20	65	42	5	4	4	18	Rockwell C60	15,100	0.03	-40° to 350°	Required	0000000	00000000
M20	65	42	5	5	4	18	Rockwell C60	20,600	0.03	-40° to 350°	Required	0000000	00000000