Ball Nuts | McMaster-Carr

Clear All

	System of Measurement System of Measurement

Inch

Metric

	Thread Size Thread Size

	Component Component	Show

Ball Nut

	Component Component	Hide

Ball Nut

Ball Screw

Ball Screw with One
Machined End

	Nut Type Nut Type


Flange	Externally Threaded

Platform

	Length Length

	Diameter Diameter

	Travel Distance per Turn Travel Distance per Turn

	Material Material

Stainless Steel

Steel

	Thread Direction Thread Direction


Right Hand	Left Hand

	Dynamic Thrust Load Capacity Dynamic Thrust Load Capacity

10,000 lbs. or greater

	Threading Threading

	Fully Threaded

	Thread Type Thread Type

Ball

Metric Ball

	Number of Thread Starts Number of Thread Starts

	Flange Material Flange Material

Steel

Stainless Steel

	Maximum Backlash Maximum Backlash

	Number of Mounting Holes Number of Mounting Holes

	Flange Thickness Flange Thickness

	Maximum Temperature Maximum Temperature

150° to 199° F

250° to 499° F

	Minimum Temperature Minimum Temperature

-65° F

-40° F

5° F

	Root Diameter Root Diameter

	Hardness Hardness

Rockwell C38

Rockwell C56

Rockwell C58

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

View catalog pages (2)

Forward

How can we improve?

67 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.

Black-oxide alloy steel ball nuts have mild corrosion resistance.

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.

Externally-Threaded Ball Nuts—Right-Hand Threaded

Secure a way wiper on the end of a ball nut to sweep chips and other contaminants out of the way as it moves across the ball screw.

Ball Nuts															Way Wipers
	Thread Size	Lg.	Wd.	Ht.	Dia.	No. of Thread Starts	Travel Distance per Turn	External Thread Size	Hardness	Dynamic Thrust Load Cap., lbs.	Max. Backlash	Temperature Range, °F		Each		Each
Black-Oxide Alloy Steel
A	3/8"-8	1 11/64"	__	__	3/4"	1	0.125"	11/16"-28	Rockwell C56	150	0.015"	-40° to 300°	00000000	000000	000000	00
A	1/2"-5	2 3/4"	__	__	1 1/16"	1	0.2"	15/16"-16	Rockwell C56	1,200	0.015"	-40° to 300°	00000000	000000	0000000	000000
A	3/4"-5	2 57/64"	__	__	1 5/16"	1	0.2"	1.173"-18	Rockwell C56	1,900	0.015"	-40° to 300°	00000000	000000	0000000	00000
A	1 1/2"-2	5 19/32"	__	__	2 5/8"	1	0.5"	2.360"-18	Rockwell C56	14,500	0.015"	-40° to 300°	00000000	000000	000000	00
A	1 1/2"-4	3 1/4"	__	__	2 3/32"	1	0.25"	1 31/32"-18	Rockwell C56	4,000	0.015"	-40° to 300°	00000000	000000	000000	00
A	2 1/4"-2	6 11/16"	__	__	3 3/8"	1	0.5"	3.137"-12	Rockwell C56	19,250	0.015"	-40° to 300°	00000000	00000000	000000	00
B	5/8"-5	1 23/32"	1"	1"	__	1	0.2"	15/16"-16	Rockwell C56	770	0.015"	-40° to 300°	00000000	00000	000000	00
B	1"-4	2 11/32"	1 1/2"	1 1/2"	__	1	0.25"	1 9/16"-18	Rockwell C56	1,600	0.015"	-40° to 300°	00000000	000000	000000	00

Externally-Threaded Ball Nuts—Left-Hand Threaded

Secure a way wiper on the end of a ball nut to sweep chips and other contaminants out of the way as it moves across the ball screw.

Ball Nuts														Way Wipers
	Thread Size	Lg.	Wd.	Ht.	No. of Thread Starts	Travel Distance per Turn	External Thread Size	Hardness	Dynamic Thrust Load Cap., lbs.	Max. Backlash	Temperature Range, °F		Each		Each
Black-Oxide Alloy Steel
A	1"-4	2 11/32"	__	__	1	0.25"	1.563"-18	Rockwell C56	1,600	0.015"	-40° to 300°	00000000	0000000	0000000	000000
B	5/8"-5	1 45/64"	1"	1"	1	0.2"	15/16"-16	Rockwell C56	770	0.015"	-40° to 300°	00000000	00000	0000000	00000

Flange Ball Nuts—Right-Hand Threaded

						Flange
	Thread Size	Lg.	Wd.	Ht.	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
Black-Oxide Alloy Steel
C	3/8"-8	1"	__	__	3/4"	1 39/64"	11/32"	1	0.125"	1 15/64"	Rockwell C56	130	0.015"	-40° to 300°	00000000	0000000
C	1/2"-5	2 57/64"	__	__	1 1/16"	2 19/32"	17/32"	1	0.2"	2 3/32"	Rockwell C56	1,200	0.015"	-40° to 300°	00000000	000000
C	3/4"-5	2 57/64"	__	__	1 5/16"	2 39/64"	17/32"	1	0.2"	2 3/32"	Rockwell C56	1,900	0.015"	-40° to 300°	00000000	000000
C	1 1/2"-2	5 19/32"	__	__	2 5/8"	4 21/32"	25/32"	1	0.5"	3 7/8"	Rockwell C56	14,500	0.015"	-40° to 300°	00000000	000000
C	1 1/2"-4	3 9/32"	__	__	2 3/32"	4 3/8"	13/16"	1	0.25"	3 1/2"	Rockwell C56	4,000	0.015"	-40° to 300°	00000000	000000
C	2 1/4"-2	6 23/32"	__	__	3 3/8"	5 3/8"	1 37/64"	1	0.5"	4 3/8"	Rockwell C56	19,250	0.015"	-40° to 300°	00000000	00000000
D	5/8"-5	1 23/32"	1"	1"	__	2 39/64"	17/32"	1	0.2"	2 3/32"	Rockwell C56	770	0.015"	-40° to 300°	00000000	000000
D	1"-4	2 11/32"	1 1/2"	1 1/2"	__	3 1/4"	5/8"	1	0.25"	2 3/4"	Rockwell C56	1,600	0.015"	-40° to 300°	00000000	000000

Flange Ball Nuts—Left-Hand Threaded

						Flange
	Thread Size	Lg.	Wd.	Ht.	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
Black-Oxide Alloy Steel
D	5/8"-5	1 45/64"	1"	1"	__	2 19/32"	17/32"	1	0.2"	2 3/32"	Rockwell C56	770	0.015"	-40° to 300°	00000000	0000000
D	1"-4	2 11/32"	1 1/2"	1 1/2"	1"	3 1/4"	5/8"	1	0.25"	2 3/4"	Rockwell C56	1,600	0.015"	-40° to 300°	00000000	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.

Black-oxide alloy steel ball nuts have mild corrosion resistance.

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.

Externally Threaded Ball Nuts—Right-Hand Threaded

Secure a way wiper on the end of a ball nut to sweep chips and other contaminants out of the way as it moves across the ball screw.

Ball Nuts															Way Wipers
	Thread Size	Lg.	Wd.	Ht.	Dia.	No. of Thread Starts	Travel Distance per Turn	External Thread Size	Hardness	Dynamic Thrust Load Cap., lbs.	Max. Backlash	Temperature Range, °F		Each		Each
Black-Oxide Alloy Steel
A	1/2"-4	1 3/4"	__	__	1"	2	0.5"	15/16"-16	Rockwell C56	1,050	0.015"	-40° to 300°	00000000	0000000	000000	00
A	3/4"-4	2 15/16"	__	__	1 5/16"	2	0.5"	1 1/4"-18	Rockwell C56	3,400	0.015"	-40° to 300°	00000000	000000	000000	00
A	1"-4	3 1/8"	__	__	1 11/16"	2	0.5"	1 9/16"-18	Rockwell C56	3,900	0.015"	-40° to 300°	00000000	000000	000000	00
A	1 1/2"-2	3 5/8"	__	__	2 5/8"	2	1"	2 1/4"-20	Rockwell C56	8,200	0.015"	-40° to 300°	00000000	000000	0000000	000000
B	1"-4	3"	1 1/2"	1 1/2"	__	4	1"	1 9/16"-18	Rockwell C56	2,350	0.015"	-40° to 300°	00000000	000000	000000	00

Flange Ball Nuts—Right-Hand Threaded

Ball Nuts
						Flange											Way Wipers
	Thread Size	Lg.	Wd.	Ht.	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		Each
Black-Oxide Alloy Steel
C	1/2"-4	1 3/4"	__	__	1"	2 19/32"	17/32"	2	0.5"	2 3/32"	Rockwell C56	1,050	0.015"	-40° to 300°	00000000	0000000	000000	00
C	3/4"-4	2 15/16"	__	__	1 5/16"	2 5/8"	17/32"	2	0.5"	2 3/32"	Rockwell C56	3,400	0.015"	-40° to 300°	00000000	000000	000000	00
C	1"-4	3 1/8"	__	__	1 11/16"	3 1/4"	5/8"	2	0.5"	2 3/4"	Rockwell C56	3,900	0.015"	-40° to 300°	00000000	000000	000000	00
C	1 1/2"-2	3 5/8"	__	__	2 5/8"	4 15/16"	1 1/64"	2	1"	4 1/8"	Rockwell C56	8,200	0.015"	-40° to 300°	00000000	000000	0000000	000000
D	1"-4	3"	1 1/2"	1 1/2"	__	3 1/4"	5/8"	4	1"	2 3/4"	Rockwell C56	2,350	0.015"	-40° to 300°	00000000	000000	000000	00

Self-Stopping Ball Screws and Nuts

Stop Pin Shown Installed

Keep your ball screw spinning without the ball nut damaging your system—a clutch-like collar inside the ball nut prevents it from travelling past the stop pins. Install the included stop pins anywhere along the length of the ball screw by drilling a hole in the valley of the threads (also known as the root) and pressing in the stop pin. When the collar meets the stop pin, the ball nut disengages from the threads and begins to idle. To start the ball nut travelling again, spin the ball screw in the opposite direction. All components are black-oxide steel and have mild corrosion resistance. To ensure compatibility, select components that have the same thread 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.

Externally Threaded Ball Nuts—Right-Hand Threaded

Black-Oxide Alloy 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
5/8"-6	1 7/8"	1"	2	0.188"	15/16"-16	Rockwell C56	300	0.006"	-65° to 300°	0000000	000000
1"-2	2 23/32"	1 5/8"	2	0.2"	1.563"-18	Rockwell C56	900	0.008"	-65° to 300°	0000000	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
Black-Oxide Alloy Steel
5/8"-6	1 7/8"	1"	2"	13/32"	2	0.188"	1 5/8"	Rockwell C56	300	0.006"	-65° to 300°	0000000	0000000
1"-2	2 23/32"	1 5/8"	3 15/64"	5/8"	2	0.2"	2 3/4"	Rockwell C56	900	0.008"	-65° to 300°	0000000	000000

Fast-Travel Corrosion-Resistant Ball Screws and Nuts

Multiple thread channels (also known as thread starts) create faster linear travel than ball screws with a single thread start. Suitable for use in harsh environments, these ball screws and nuts are made of stainless steel. 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. 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.

Externally Threaded Ball Nut—Right-Hand Threaded

17-4 PH Stainless 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
1/2"-4	1 3/4"	1 1/16"	2	0.5"	15/16"-16	Rockwell C38	140	0.007"	-65° to 300°	0000000	0000000
3/4"-4	2 15/16"	1 5/16"	2	0.5"	1 1/4"-16	Rockwell C38	600	0.007"	-65° to 300°	0000000	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
17-4 PH Stainless Steel
1/2"-4	1 29/32"	1 1/16"	2 19/32"	17/32"	2	0.5"	2 3/32"	Rockwell C38	140	0.007"	-65° to 300°	0000000	0000000
3/4"-4	2 15/16"	1 5/16"	2 19/32"	17/32"	2	0.5"	2 3/32"	Rockwell C38	600	0.007"	-65° to 300°	0000000	000000

Corrosion-Resistant Ball Screws and Nuts

Suitable for use in harsh environments, these ball screws and nuts are made of stainless steel. 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 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.

Externally Threaded Ball Nuts—Right-Hand Threaded

17-4 PH Stainless Steel
	Thread Size	Lg.	Wd.	Ht.	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	3/8"-8	1"	__	__	3/4"	1	0.125"	0.664"-32	Rockwell C38	25	0.007"	-65° to 300°	000000	0000000
B	5/8"-5	1 23/32"	1"	1"	__	1	0.2"	15/16"-16	Rockwell C38	170	0.007"	-65° to 300°	0000000	000000

Flange Ball Nuts—Right-Hand Threaded

						Flange
	Thread Size	Lg.	Wd.	Ht.	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
17-4 PH Stainless Steel
C	3/8"-8	1"	__	__	3/4"	1 19/32"	17/64"	1	0.125"	1 15/64"	Rockwell C38	25	0.007"	-65° to 300°	0000000	0000000
D	5/8"-5	1 47/64"	1"	1"	__	2 19/32"	17/32"	1	0.2"	2 3/32"	Rockwell C38	170	0.007"	-65° to 300°	0000000	000000

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 travel distance per turn. 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	No. of Thread Starts	Travel Distance per Turn, mm	Accuracy for Travel Distance per Turn	Hardness	Dynamic Thrust Load Cap., lbs.	Max. Backlash, mm	Temperature Range, °F		Each
Carbon Steel Ball Screw with Alloy Steel Flange Ball Nut
M6	150	5.3	21,000	21	13	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	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	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	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	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	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	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	1	2	±0.210 mm per 300 mm	Rockwell C58	560	0.05	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	Temperature 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

Alloy Steel
Thread Size	Lg., mm	Dia., mm	Wd., mm, mm	Ht., mm	Thick., mm	No. of Thread Starts	Travel Distance per Turn, mm	Hardness	Dynamic Thrust Load Cap., lbs.	Max. Backlash, mm	Temperature Range, °F		Each
M14	40	31	50	37	10	1	4	Rockwell C58	1,200	0.1	5° to 175°	0000000	0000000
M16	40	34	54	40	10	1	5	Rockwell C58	1,200	0.1	5° to 175°	0000000	000000
M20	40	40	60	46	10	1	5	Rockwell C58	1,300	0.1	5° to 175°	0000000	000000
M20	64	52	82	64	12	1	10	Rockwell C58	2,350	0.1	5° to 175°	0000000	000000
M25	40	43	67	50	10	1	5	Rockwell C58	1,500	0.1	5° to 175°	0000000	000000
M25	98	60	96	72	15	1	10	Rockwell C58	7,000	0.1	5° to 175°	0000000	000000