Metric Ball Screw Nuts | McMaster-Carr

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System of Measurement

Thread Size

Component

Nut Type

Length

Travel Distance per Turn

Diameter

Dynamic Thrust Load Capacity

Less than 1,000 lb.

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

Root Diameter

Thread Direction

Thread Type

Number of Thread Starts

Threading

Material

Center Height

Maximum Backlash

Mounting Hole Thread Size

Number of Mounting Holes

Flange Width

Tensile Strength

90,000 psi to 99,999 psi

100,000 psi to 129,999 psi

Flange Material

Hardness

DFARS Specialty Metals

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REACH

Compliant

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Export Control Classification Number (ECCN)

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64 Products

Ball Screws and Nuts


	Ball Nuts Flange Nut Style C

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.

Ball Screws with Flange Ball Nut—Right-Hand Threaded

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

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

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

Ball Screws—Right-Hand Threaded

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

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

	Lg., mm	No. of Thread Starts	Travel Distance per Turn, mm	Accuracy for Travel Distance per Turn	Root Dia., mm	Hardness	Tensile Strength, psi	Temp. Range, ° F		Each
Carbon Steel



	M14	500	1	4	±0.210 mm/300 mm	11.5	Rockwell C58	21,000	5 to 175	0000000	000000


	M14	1,000	1	4	±0.210 mm/300 mm	11.5	Rockwell C58	21,000	5 to 175	0000000	000000
	M16	500	1	5	±0.210 mm/300 mm	13.5	Rockwell C58	21,000	5 to 175	0000000	000000
	M16	1,000	1	5	±0.210 mm/300 mm	13.5	Rockwell C58	21,000	5 to 175	000000	000000
	M20	500	1	5	±0.210 mm/300 mm	17.2	Rockwell C58	21,000	5 to 175	0000000	000000
	M20	1,000	1	5	±0.210 mm/300 mm	17.2	Rockwell C58	21,000	5 to 175	000000	000000
	M20	1,500	1	10	±0.210 mm/300 mm	16.4	Rockwell C58	21,000	5 to 175	000000	000000
	M25	500	1	5	±0.210 mm/300 mm	22.2	Rockwell C58	21,000	5 to 175	0000000	000000
	M25	1,000	1	5	±0.210 mm/300 mm	22.2	Rockwell C58	21,000	5 to 175	0000000	000000
	M25	1,500	1	10	±0.210 mm/300 mm	20.2	Rockwell C58	21,000	5 to 175	0000000	000000

Platform Ball Nuts—Right-Hand Threaded

Image of Product. Front orientation. Contains Annotated. Ball Screws and Nuts. Ball Screws and Nuts , Platform Nut, Ball Nuts.

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

	Lg., mm	Wd., mm	Ht., mm	Ctr. Ht., mm	No. of Thread Starts	Travel Distance per Turn, mm	Hardness	Dynamic Thrust Load Cap., lb.	Max. Backlash, mm	Temp. Range, ° F		Each
Alloy Steel



	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

Style C

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

					Flange, mm
	Style	Thread Size	Lg., mm	Dia., mm	Wd.	Ht.	Thk.	No. of Thread Starts	Travel Distance per Turn, mm	Hardness	Dynamic Thrust Load Cap., lb.	Max. Backlash, mm	Temp. Range, ° F		Each
Alloy Steel



		C	M14	40	31	50	37	10	1	4	Rockwell C58	1,200	0.1	5 to 175	0000000	0000000


		C	M16	40	34	54	40	10	1	5	Rockwell C58	1,200	0.1	5 to 175	0000000	000000
		C	M20	40	40	60	46	10	1	5	Rockwell C58	1,300	0.1	5 to 175	0000000	000000
		C	M20	64	52	82	64	12	1	10	Rockwell C58	2,350	0.1	5 to 175	0000000	000000
		C	M25	40	43	67	50	10	1	5	Rockwell C58	1,500	0.1	5 to 175	0000000	000000
		C	M25	98	60	96	72	15	1	10	Rockwell C58	7,000	0.1	5 to 175	0000000	000000

Fast-Travel Ball Screws and Nuts


	Ball Nuts, Externally Threaded Nut, Style A	Ball Nuts, Externally Threaded Nut, Style B	Ball Nuts, Externally Threaded Nut, Style C	Ball Nuts Flange Nut Style E

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.

Ball Screws—Right-Hand Threaded

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

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

	Lg., mm	No. of Thread Starts	Travel Distance per Turn, mm	Accuracy for Travel Distance per Turn	Root Dia., mm	Hardness	Tensile Strength, psi	Temp. Range, ° F		Each
Carbon Steel



	M12	500	2	10	±0.05 mm/300 mm	9.6	Rockwell C56	95,000	32 to 150	00000000	0000000


	M12	1,000	2	10	±0.05 mm/300 mm	9.6	Rockwell C56	95,000	32 to 150	00000000	000000
	M15	500	4	16	±0.05 mm/300 mm	12.9	Rockwell C56	95,000	32 to 150	00000000	00000
	M15	500	4	20	±0.05 mm/300 mm	12.3	Rockwell C56	95,000	32 to 150	00000000	000000
	M15	1,000	4	16	±0.05 mm/300 mm	12.9	Rockwell C56	95,000	32 to 150	00000000	000000
	M15	1,000	4	20	±0.05 mm/300 mm	12.3	Rockwell C56	95,000	32 to 150	00000000	000000
	M16	500	4	16	±0.05 mm/300 mm	13.3	Rockwell C56	95,000	32 to 150	00000000	00000
	M16	1,000	4	16	±0.05 mm/300 mm	13.3	Rockwell C56	95,000	32 to 150	00000000	000000
	M20	500	4	20	±0.05 mm/300 mm	17	Rockwell C56	95,000	32 to 150	00000000	000000
	M20	1,000	4	20	±0.05 mm/300 mm	17	Rockwell C56	95,000	32 to 150	00000000	000000
	M32	500	2	20	±0.05 mm/300 mm	28.5	Rockwell C56	95,000	32 to 150	00000000	000000


	M32	500	4	32	±0.05 mm/300 mm	28.3	Rockwell C56	95,000	32 to 150	00000000	000000
	M32	1,000	2	20	±0.05 mm/300 mm	28.5	Rockwell C56	95,000	32 to 150	00000000	000000
	M32	1,000	4	32	±0.05 mm/300 mm	28.3	Rockwell C56	95,000	32 to 150	00000000	000000
	M40	500	4	40	±0.05 mm/300 mm	35.4	Rockwell C56	95,000	32 to 150	00000000	000000
	M40	1,000	4	40	±0.05 mm/300 mm	35.4	Rockwell C56	95,000	32 to 150	00000000	000000

Externally Threaded Ball Nuts—Right-Hand Threaded


Style A	Style B	Style C

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

	Thread Size	Lg., mm	Dia., mm	No. of Thread Starts	Travel Distance per Turn, mm	External Thread Size	Hardness	Dynamic Thrust Load Cap., lb.	Max. Backlash, mm	Temp. Range, ° F		Each
Carbon Steel



	A	M12	50	30	1	10	M25	Rockwell C56	1,000	0.02	32 to 150	00000000	0000000


	B	M16	50	39	4	16	M30	Rockwell C56	1,500	0.04	32 to 150	00000000	000000
	C	M32	90	53	4	32	M50	Rockwell C56	3,700	0.03	32 to 150	00000000	000000

Flange Ball Nuts—Right-Hand Threaded

Style E

Image of Attribute. Front orientation. Contains Annotated. Fast-Travel Ball Screws and Nuts.

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

					Flange, mm
	Style	Thread Size	Lg., mm	Dia., mm	Dia.	Thk.	No. of Thread Starts	Travel Distance per Turn, mm	Bolt Circle Dia., mm	Hardness	Dynamic Thrust Load Cap., lb.	Max. Backlash, mm	Temp. Range, ° F		Each
Carbon Steel



		E	M12	43	23	40	10	2	10	32	Rockwell C56	1,100	0.02	32 to 150	00000000	0000000


		E	M15	56	33	57	10	4	20	45	Rockwell C56	2,250	0.04	32 to 150	00000000	000000
		E	M15	61	27	48	10	4	16	38	Rockwell C56	2,200	0.04	32 to 150	00000000	000000
		E	M20	77	35	58	10	4	20	47	Rockwell C56	2,750	0.04	32 to 150	00000000	000000
		E	M32	88	53	86	14	4	32	71	Rockwell C56	5,800	0.05	32 to 150	00000000	000000
		E	M32	108	49	80	16	2	20	65	Rockwell C56	4,900	0.04	32 to 150	00000000	000000
		E	M40	101	66	106	18	4	40	85	Rockwell C56	9,550	0.07	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—Right-Hand Partially Threaded

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

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

	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
Alloy Steel



	M15	642	5	4	±0.023 mm/300 mm	522	14.59	Rockwell C60	105,000	0000000	000000000


	M15	642	5	5	±0.023 mm/300 mm	522	14.44	Rockwell C60	105,000	0000000	00000000
	M20	680	5	4	±0.023 mm/300 mm	561	19.15	Rockwell C60	105,000	0000000	00000000
	M20	680	5	5	±0.023 mm/300 mm	561	19.05	Rockwell C60	105,000	0000000	00000000

Round Nuts—Right-Hand Thread

Image of Product. Front orientation. Roller Screws and Nuts. Nuts.

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

						Keyway, mm
	Thread Size	Lg., mm	Dia., mm	No. of Thread Starts	Travel Distance per Turn, mm	Wd.	Dp.	Hardness	Dynamic Thrust Load Cap., lb.	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