Metric Acme Nuts | McMaster-Carr

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	Thread Type Thread Type

Metric Rounded
Trapezoidal

Metric Trapezoidal

	System of Measurement System of Measurement

Metric

	Thread Size Thread Size

	Thread Pitch Thread Pitch

	Nut Type Nut Type

	Component Component

	Collar
	Lead Screw
	Nut

	Material Material

	Length Length

	Width Width

	Height Height

	Diameter Diameter

	Thread Direction Thread Direction

	Right Hand

	Travel Distance per Turn Travel Distance per Turn

	Number of Thread Starts Number of Thread Starts

	OD OD

	Speed Ratio Speed Ratio

	Hardness Hardness

	Flange Material Flange Material

Steel

Bronze

Plastic

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

DFARS Specialty Metals
Compliant

	Tensile Strength Tensile Strength

Less than 10,000 psi

10,000 to 19,999 psi

40,000 to 99,999 psi

100,000 psi or greater

Not Rated

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

RoHS Compliant

RoHS Compliant with
Exemptions

	Thread Fit Thread Fit

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

REACH Compliant

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134 Products

Selecting Compatible Lead Screws and Nuts

About Shaft Collars

Shaft collars are useful for holding and positioning components on a shaft. They can also serve as mechanical stops and stroke limiters.

About Washers

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. 360 brass components have excellent machinability and good 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
M10	2	500	1	1:1	2	7e	Grade 2	Not Rated	ASTM A108, ASTM A193, DIN 103	000000000	000000
M10	2	1,000	1	1:1	2	7e	Grade 2	Not Rated	ASTM A108, ASTM A193, DIN 103	000000000	00000
M12	3	500	1	1:1	3	7e	Grade 2	Not Rated	ASTM A108, ASTM A193, DIN 103	000000000	00000
M12	3	1,000	1	1:1	3	7e	Grade 2	Not Rated	ASTM A108, ASTM A193, DIN 103	000000000	00000
M12	3	2,000	1	1:1	3	7e	Grade 2	Rockwell B72	ASTM A108	000000000	000000
M16	4	500	1	1:1	4	7e	Grade 2	Not Rated	ASTM A108, ASTM A193, DIN 103	000000000	00000
M16	4	1,000	1	1:1	4	7e	Grade 2	Not Rated	ASTM A108, ASTM A193, DIN 103	000000000	00000
M16	4	2,000	1	1:1	4	7e	Grade 2	Rockwell B72	ASTM A108	000000000	000000
M20	4	1,000	1	1:1	4	7e	Grade 2	Not Rated	ASTM A108, ASTM A193, DIN 103	000000000	000000
M20	4	2,000	1	1:1	4	7e	Grade 2	Rockwell B72	ASTM A108	000000000	000000
M26	5	1,000	1	1:1	5	7e	Grade 2	Not Rated	ASTM A108, ASTM A193, DIN 103	000000000	00000
M26	5	2,000	1	1:1	5	7e	Grade 2	Rockwell B72	ASTM A108	000000000	000000
M40	7	1,000	1	1:1	7	7e	Grade 2	Not Rated	ASTM A108, ASTM A193, DIN 103	000000000	000000
M40	7	2,000	1	1:1	7	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
M10	2	35	28	48	12	1	1:1	2	7H	Not Rated	000000000	0000000
M12	3	35	28	48	12	1	1:1	3	7H	Not Rated	000000000	00000
M16	4	35	28	48	12	1	1:1	4	7H	Not Rated	000000000	00000
M20	4	44	32	55	12	1	1:1	4	7H	Not Rated	000000000	000000
M26	5	46	38	62	14	1	1:1	5	7H	Not Rated	000000000	000000
M40	7	66	63	98	16	1	1:1	7	7H	Not Rated	000000000	000000

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
M12	3	12	22.2	1	1:1	3	7H	Grade 2	Not Rated	000000000	000000
M16	4	16	27	1	1:1	4	7H	Grade 2	Not Rated	000000000	00000
M20	4	20	31.75	1	1:1	4	7H	Grade 2	Not Rated	000000000	00000
M26	5	25.4	41.3	1	1:1	5	7H	Grade 2	Not Rated	000000000	00000
M40	7	39.9	60.33	1	1:1	7	7H	Grade 2	Not Rated	000000000	00000

Square Nuts—Right-Hand Threaded

Square nuts fasten and position lead screw components. Square nuts have large sides, which make them easier to grip with a wrench than hex nuts and keep them from rotating in channels and square holes.

360 Brass
Thread Size	Thread Pitch, mm	Ht., mm	Wd., mm	No. of Thread Starts	Speed Ratio	Travel Distance per Turn, mm	Thread Fit	Hardness		Each
M10	2	20	19	1	1:1	2	7H	Not Rated	000000000	000000
M12	3	25	25	1	1:1	3	7H	Not Rated	000000000	00000
M16	4	35	28	1	1:1	4	7H	Not Rated	000000000	00000
M20	4	50	38	1	1:1	4	7H	Not Rated	000000000	00000

Metric Precision 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.

932 bearing bronze nuts have good machinability and wear resistance. 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
M10	2	250	1	1:1	2	±0.15 mm per 300 mm	8e	Brinell 150	85,000	DIN 103	0000000	000000
M10	2	500	1	1:1	2	±0.15 mm per 300 mm	8e	Brinell 150	85,000	DIN 103	0000000	00000
M10	2	750	1	1:1	2	±0.15 mm per 300 mm	8e	Brinell 150	85,000	DIN 103	0000000	00000
M10	2	1,750	1	1:1	2	±0.15 mm per 300 mm	8e	Brinell 150	70,000	DIN 103	000000	00000
M12	3	500	1	1:1	3	±0.15 mm per 300 mm	8e	Brinell 150	85,000	DIN 103	0000000	00000
M12	3	1,000	1	1:1	3	±0.15 mm per 300 mm	8e	Brinell 150	85,000	DIN 103	0000000	00000
M12	3	1,750	1	1:1	3	±0.15 mm per 300 mm	8e	Brinell 150	70,000	DIN 103	000000	00000
M16	3	500	1	1:1	3	±0.15 mm per 300 mm	8e	Brinell 150	85,000	DIN 103	0000000	00000
M16	3	1,000	1	1:1	3	±0.15 mm per 300 mm	8e	Brinell 150	85,000	DIN 103	0000000	00000
M16	3	1,750	1	1:1	3	±0.15 mm per 300 mm	8e	Brinell 150	70,000	DIN 103	000000	00000
M20	4	500	1	1:1	4	±0.15 mm per 300 mm	8e	Brinell 150	85,000	DIN 103	0000000	00000
M20	4	1,000	1	1:1	4	±0.15 mm per 300 mm	8e	Brinell 150	85,000	DIN 103	0000000	00000
M20	4	1,750	1	1:1	4	±0.15 mm per 300 mm	8e	Brinell 150	70,000	DIN 103	000000	000000
M24	5	500	1	1:1	5	±0.15 mm per 300 mm	8e	Brinell 150	85,000	DIN 103	0000000	00000
M24	5	1,000	1	1:1	5	±0.15 mm per 300 mm	8e	Brinell 150	85,000	DIN 103	0000000	00000
M24	5	1,750	1	1:1	5	±0.15 mm per 300 mm	8e	Brinell 150	70,000	DIN 103	000000	000000
M28	5	1,000	1	1:1	5	±0.15 mm per 300 mm	8e	Brinell 150	85,000	DIN 103	0000000	00000
M28	5	1,750	1	1:1	5	±0.15 mm per 300 mm	8e	Brinell 150	85,000	DIN 103	0000000	000000
M40	7	1,000	1	1:1	7	±0.15 mm per 300 mm	8e	Brinell 150	85,000	DIN 103	0000000	000000
M40	7	1,750	1	1:1	7	±0.15 mm per 300 mm	8e	Brinell 150	70,000	DIN 103	0000000	000000

Round Nuts—Right-Hand Threaded

932 Bearing Bronze
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
M10	2	3/4"	0.75"	1	1:1	2	7H	Brinell 70	Not Rated	670	DIN 103	0000000	000000
M12	3	1"	0.875"	1	1:1	3	7H	Brinell 70	Not Rated	1,100	DIN 103	0000000	00000
M16	3	1 1/8"	1.125"	1	1:1	3	7H	Brinell 70	Not Rated	2,000	DIN 103	0000000	00000
M20	4	1 1/2"	1.25"	1	1:1	4	7H	Brinell 70	Not Rated	3,100	DIN 103	0000000	00000
M24	5	2"	1.75"	1	1:1	5	7H	Brinell 70	Not Rated	4,500	DIN 103	0000000	00000
M28	5	2"	1.75"	1	1:1	5	7H	Brinell 69	44,000	6,100	DIN 103	0000000	00000
M40	7	3"	2.5"	1	1:1	7	7H	Brinell 70	Not Rated	12,300	DIN 103	0000000	00000

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
M10	2	5/8"	0.68"	1	1:1	2	9/16"-18	3/8"	7H	Brinell 126	75,000	670	DIN 103	0000000	000000
M12	3	3/4"	1.125"	1	1:1	3	15/16"-16	1/2"	7H	Brinell 126	75,000	1,100	DIN 103	0000000	00000
M16	3	1"	1.125"	1	1:1	3	15/16"-16	1/2"	7H	Brinell 126	75,000	2,000	DIN 103	0000000	00000
M20	4	1 1/4"	1.125"	1	1:1	4	1"-18	1/2"	7H	Brinell 126	75,000	3,100	DIN 103	0000000	00000
M24	5	1 1/2"	1.5"	1	1:1	5	1 3/8"-16	1/2"	7H	Brinell 126	75,000	4,500	DIN 103	0000000	000000
M28	5	1 3/4"	2.125"	1	1:1	5	1 31/32"-18	13/16"	7H	Brinell 126	75,000	6,100	DIN 103	0000000	000000
M40	7	2 19/64"	2.125"	1	1:1	7	1 31/32"-18	13/16"	7H	Brinell 126	75,000	12,300	DIN 103	0000000	000000

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
Manganese Bronze
M10	2	5/8"	0.688"	1 39/64"	13/32"	1	1:1	2	1 1/8"	7H	Brinell 126	Not Rated	670	DIN 103	0000000	000000
M12	3	3/4"	1.125"	2 39/64"	17/32"	1	1:1	3	2 3/32"	7H	Brinell 126	Not Rated	1,100	DIN 103	0000000	00000
M16	3	1"	1.125"	2 39/64"	17/32"	1	1:1	3	2 3/32"	7H	Brinell 126	Not Rated	2,000	DIN 103	0000000	00000
M20	4	1 1/4"	1.125"	2 39/64"	17/32"	1	1:1	4	2 3/32"	7H	Brinell 126	Not Rated	3,100	DIN 103	0000000	00000
M24	5	1 1/2"	1.5"	2 3/4"	33/64"	1	1:1	5	2 17/64"	7H	Brinell 126	Not Rated	4,500	DIN 103	0000000	00000
M28	5	1 3/4"	2.125"	4 13/64"	53/64"	1	1:1	5	3 7/16"	7H	Brinell 126	75,000	6,100	DIN 103	0000000	000000
M40	7	2 19/64"	2.125"	4 13/64"	53/64"	1	1:1	7	3 7/16"	7H	Brinell 126	Not Rated	12,300	DIN 103	0000000	000000

Metric Fast-Travel Ultra-Precision Lead Screws and Nuts

Multiple thread channels (also known as thread starts) create faster linear travel than lead screws with a single thread start. Operating with less backlash (play) than Metric Precision Acme Lead Screws and Nuts, these lead screws and nuts provide increased nut life and more reliable movement in automated systems. To ensure compatibility, select components that have the same thread type, thread size, thread pitch, and number of thread starts.

Nuts are acetal plastic; they have good wear and corrosion resistance.

Alloy steel lead screws are hard and strong. 303 and 304 stainless steel lead screws have good 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

4140 Alloy Steel
Thread Size	Thread Pitch, mm	Lg., mm	No. of Thread Starts	Thread Type	Speed Ratio	Travel Distance per Turn, mm	Accuracy for Travel Distance per Turn	Hardness	Tensile Strength, psi		Each
M5	1.25	100	4	Metric Rounded Trapezoidal	4:1	5	±0.089 mm per 300 mm	Brinell 200	90,000	000000000	000000
M5	1.25	175	4	Metric Rounded Trapezoidal	4:1	5	±0.089 mm per 300 mm	Brinell 200	125,000	000000000	00000
M8	2	200	2	Metric Rounded Trapezoidal	2:1	4	±0.089 mm per 300 mm	Brinell 200	125,000	000000000	00000
M8	2	300	2	Metric Rounded Trapezoidal	2:1	4	±0.089 mm per 300 mm	Brinell 200	125,000	000000000	00000
303 Stainless Steel
M2	0.5	50	2	Metric Rounded Trapezoidal	2:1	1	±0.089 mm per 300 mm	Brinell 160	90,000	000000000	00000
M2	0.5	100	2	Metric Rounded Trapezoidal	2:1	1	±0.089 mm per 300 mm	Brinell 160	90,000	000000000	00000
M4	1.25	75	8	Metric Rounded Trapezoidal	8:1	10	±0.089 mm per 300 mm	Brinell 160	90,000	000000000	00000
M4	1.25	150	8	Metric Rounded Trapezoidal	8:1	10	±0.089 mm per 300 mm	Brinell 160	90,000	000000000	00000
304 Stainless Steel
M8	2.5	250	4	Metric Rounded Trapezoidal	4:1	10	±0.1 mm per 300 mm	Brinell 160	72,000	0000000	00000
M8	2.5	500	4	Metric Rounded Trapezoidal	4:1	10	±0.1 mm per 300 mm	Brinell 160	72,000	0000000	00000
M10	3	250	4	Metric Rounded Trapezoidal	4:1	12	±0.1 mm per 300 mm	Brinell 160	72,000	0000000	00000
M10	3	500	4	Metric Rounded Trapezoidal	4:1	12	±0.1 mm per 300 mm	Brinell 160	72,000	0000000	00000
M12	2.5	250	2	Metric Rounded Trapezoidal	2:1	5	±0.1 mm per 300 mm	Brinell 160	72,000	0000000	00000
M12	2.5	500	2	Metric Rounded Trapezoidal	2:1	5	±0.1 mm per 300 mm	Brinell 160	72,000	0000000	00000
M12	2.5	1,000	2	Metric Rounded Trapezoidal	2:1	5	±0.1 mm per 300 mm	Brinell 160	72,000	0000000	000000
M16	5	250	7	Metric Rounded Trapezoidal	7:1	35	±0.1 mm per 300 mm	Brinell 160	72,000	0000000	00000
M16	5	500	7	Metric Rounded Trapezoidal	7:1	35	±0.1 mm per 300 mm	Brinell 160	72,000	0000000	000000
M16	5	1,000	7	Metric Rounded Trapezoidal	7:1	35	±0.1 mm per 300 mm	Brinell 160	72,000	0000000	000000
M20	5	500	4	Metric Rounded Trapezoidal	4:1	20	±0.1 mm per 300 mm	Brinell 160	72,000	0000000	000000
M20	5	1,000	4	Metric Rounded Trapezoidal	4:1	20	±0.1 mm per 300 mm	Brinell 160	72,000	0000000	000000
M20	7.5	500	8	Metric Rounded Trapezoidal	8:1	60	±0.1 mm per 300 mm	Brinell 160	72,000	0000000	000000
M20	7.5	1,000	8	Metric Rounded Trapezoidal	8:1	60	±0.1 mm per 300 mm	Brinell 160	72,000	0000000	000000

Round Nuts—Right-Hand Threaded

Acetal Plastic
	Thread Size	Thread Pitch, mm	Lg.	Dia.	No. of Thread Starts	Thread Type	Speed Ratio	Travel Distance per Turn, mm	Hardness	Tensile Strength, psi	Dynamic Thrust Load Cap.	Temperature Range, °F		Each
A	M8	2.5	15/32"	0.709"	4	Metric Rounded Trapezoidal	4:1	10	Durometer 74D	10,000	Not Rated	-40° to 185°	0000000	000000
A	M10	3	25/32"	0.866"	4	Metric Rounded Trapezoidal	4:1	12	Durometer 74D	10,000	Not Rated	-40° to 185°	0000000	00000
A	M12	2.5	15/16"	1.024"	2	Metric Rounded Trapezoidal	2:1	5	Durometer 74D	10,000	Not Rated	-40° to 185°	0000000	00000
A	M16	5	1 17/64"	1.417"	7	Metric Rounded Trapezoidal	7:1	35	Durometer 74D	10,000	Not Rated	-40° to 185°	0000000	00000
A	M20	5	1 37/64"	1.772"	4	Metric Rounded Trapezoidal	4:1	20	Durometer 74D	10,000	Not Rated	-40° to 185°	0000000	00000
A	M20	7.5	1 37/64"	1.772"	8	Metric Rounded Trapezoidal	8:1	60	Durometer 74D	10,000	Not Rated	-40° to 185°	0000000	00000

Externally Threaded Nuts—Right-Hand Threaded

										External Thread
	Thread Size	Thread Pitch, mm	Lg.	Dia.	Hex Wd.	No. of Thread Starts	Thread Type	Speed Ratio	Travel Distance per Turn, mm	Size	Lg.	Tensile Strength, psi	Dynamic Thrust Load Cap., lbs.	Temperature Range, °F		Each
Acetal Plastic
B	M2	0.5	11/16"	0.297"	7/16"	2	Metric Rounded Trapezoidal	2:1	1	3/8"-24	3/16"	8,000	10	-40° to 185°	000000000	000000
B	M4	1.25	11/16"	0.297"	7/16"	8	Metric Rounded Trapezoidal	8:1	10	3/8"-24	3/16"	8,000	25	-40° to 185°	000000000	00000
B	M5	1.25	11/16"	0.297"	7/16"	4	Metric Rounded Trapezoidal	4:1	5	3/8"-24	3/16"	8,000	25	-40° to 185°	000000000	00000
B	M8	2	1"	0.548"	11/16"	2	Metric Rounded Trapezoidal	2:1	4	5/8"-18	1/4"	8,000	75	-40° to 185°	000000000	00000

Flange Nuts—Right-Hand Threaded

					Flange
	Thread Size	Thread Pitch, mm	Lg.	Dia.	Dia.	Wd.	Ht.	Thick.	No. of Thread Starts	Thread Type	Speed Ratio	Travel Distance per Turn, mm	Mounting Hole Ctr.-to-Ctr.	Bolt Circle Dia.	Tensile Strength, psi	Dynamic Thrust Load Cap., lbs.	Temp. Range, °F		Each
Acetal Plastic
C	M2	0.5	1/2"	0.297"	__	3/4"	13/32"	1/8"	2	Metric Rounded Trapezoidal	2:1	1	39/64"	__	8,000	10	-40° to 185°	000000000	000000
C	M4	1.25	1/2"	0.297"	__	3/4"	13/32"	1/8"	8	Metric Rounded Trapezoidal	8:1	10	39/64"	__	8,000	25	-40° to 185°	000000000	00000
C	M5	1.25	1/2"	0.297"	__	3/4"	13/32"	1/8"	4	Metric Rounded Trapezoidal	4:1	5	39/64"	__	8,000	25	-40° to 185°	000000000	00000
D	M8	2	3/4"	0.548"	1 1/8"	__	__	3/16"	2	Metric Rounded Trapezoidal	2:1	4	__	7/8"	8,000	75	-40° to 185°	000000000	00000
E	M8	2.5	25/32"	0.787"	1 27/64"	__	__	5/16"	4	Metric Rounded Trapezoidal	4:1	10	__	1 7/64"	10,000	Not Rated	-40° to 185°	0000000	00000
E	M10	3	63/64"	0.984"	1 21/32"	__	__	25/64"	4	Metric Rounded Trapezoidal	4:1	12	__	1 11/32"	10,000	Not Rated	-40° to 185°	0000000	00000
E	M12	2.5	1 3/8"	1.102"	1 57/64"	__	__	15/32"	2	Metric Rounded Trapezoidal	2:1	5	__	1 1/2"	10,000	Not Rated	-40° to 185°	0000000	00000
E	M16	5	1 3/8"	1.102"	1 57/64"	__	__	15/32"	7	Metric Rounded Trapezoidal	7:1	35	__	1 1/2"	10,000	Not Rated	-40° to 185°	0000000	00000
E	M20	5	1 47/64"	1.26"	2 11/64"	__	__	15/32"	4	Metric Rounded Trapezoidal	4:1	20	__	1 49/64"	10,000	Not Rated	-40° to 185°	0000000	000000
E	M20	7.5	1 47/64"	1.26"	2 11/64"	__	__	15/32"	8	Metric Rounded Trapezoidal	8:1	60	__	1 49/64"	10,000	Not Rated	-40° to 185°	0000000	000000

Metric Ultra-Precision Lead Screws and Nuts

Operating with less backlash (play) than Metric Precision Acme Lead Screws and Nuts, these provide increased nut life and more reliable movement in automated systems. 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 type and thread size.

Nuts are acetal plastic; they have good wear and corrosion resistance.

Alloy steel lead screws are hard and strong. 303 stainless steel lead screws have good 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

4140 Alloy Steel
Thread Size	Thread Pitch, mm	Lg., mm	No. of Thread Starts	Thread Type	Speed Ratio	Travel Distance per Turn, mm	Accuracy for Travel Distance per Turn	Hardness	Tensile Strength, psi		Each
M8	1.5	100	1	Metric Rounded Trapezoidal	1:1	1.5	±0.089 mm per 300 mm	Brinell 200	125,000	0000000	000000
M8	1.5	200	1	Metric Rounded Trapezoidal	1:1	1.5	±0.089 mm per 300 mm	Brinell 200	125,000	0000000	00000
M8	1.5	300	1	Metric Rounded Trapezoidal	1:1	1.5	±0.089 mm per 300 mm	Brinell 200	125,000	0000000	00000
303 Stainless Steel
M2	0.5	50	1	Metric Rounded Trapezoidal	1:1	0.5	±0.089 mm per 300 mm	Brinell 160	90,000	0000000	00000
M2	0.5	100	1	Metric Rounded Trapezoidal	1:1	0.5	±0.089 mm per 300 mm	Brinell 160	90,000	0000000	00000
M4	0.3	75	1	Metric Rounded Trapezoidal	1:1	0.3	±0.089 mm per 300 mm	Brinell 160	90,000	0000000	00000
M4	0.3	150	1	Metric Rounded Trapezoidal	1:1	0.3	±0.089 mm per 300 mm	Brinell 160	90,000	0000000	00000

Externally Threaded Nuts—Right-Hand Threaded

										External Thread
	Thread Size	Thread Pitch, mm	Lg.	Dia.	Hex Wd.	No. of Thread Starts	Thread Type	Speed Ratio	Travel Distance per Turn, mm	Size	Lg.	Tensile Strength, psi	Dynamic Thrust Load Cap., lbs.	Temperature Range, °F		Each
Acetal Plastic
A	M2	0.5	11/16"	0.297"	7/16"	1	Metric Rounded Trapezoidal	1:1	0.5	3/8"-24	3/16"	8,000	10	-40° to 185°	0000000	000000
A	M4	0.3	11/16"	0.297"	7/16"	1	Metric Rounded Trapezoidal	1:1	0.3	3/8"-24	3/16"	8,000	25	-40° to 185°	0000000	00000
A	M8	1.5	1"	0.548"	11/16"	1	Metric Rounded Trapezoidal	1:1	1.5	5/8"-18	1/4"	8,000	75	-40° to 185°	0000000	00000

Flange Nuts—Right-Hand Threaded

					Flange
	Thread Size	Thread Pitch, mm	Lg.	Dia.	Dia.	Wd.	Ht.	Thick.	No. of Thread Starts	Thread Type	Speed Ratio	Travel Distance per Turn, mm	Mounting Hole Ctr.-to-Ctr.	Bolt Circle Dia.	Tensile Strength, psi	Dynamic Thrust Load Cap., lbs.	Temperature Range, °F		Each
Acetal Plastic
B	M2	0.5	1/2"	0.297"	__	3/4"	13/32"	1/8"	1	Metric Rounded Trapezoidal	1:1	0.5	39/64"	__	8,000	10	-40° to 185°	0000000	000000
B	M4	0.3	1/2"	0.297"	__	3/4"	13/32"	1/8"	1	Metric Rounded Trapezoidal	1:1	0.3	39/64"	__	8,000	25	-40° to 185°	0000000	00000
C	M8	1.5	3/4"	0.548"	1 1/8"	__	__	3/16"	1	Metric Rounded Trapezoidal	1:1	1.5	__	7/8"	8,000	75	-40° to 185°	0000000	00000

Metric Clamping Lead Screw Collars

Thread these one-piece collars onto a metric lead screw to separate and position components, or use them as an end stop to limit travel. Made of black-oxide steel, they have mild corrosion resistance. Tighten the clamping screws to secure.

To ensure compatibility, please select a collar that has the same thread type, direction, size, and pitch as your lead screw.

For technical drawings and 3-D models, click on a part number.

Right-Hand Threaded
Thread Size	Thread Pitch, mm	OD, mm	Wd., mm	No. of Thread Starts	Material	Hardness		Each
M10	2	24	9	1	Black-Oxide 1215 Carbon Steel	Brinell 167	0000000	000000
M12	3	28	11	1	Black-Oxide 1215 Carbon Steel	Brinell 167	0000000	00000
M16	3	34	13	1	Black-Oxide 1215 Carbon Steel	Brinell 167	0000000	00000
M20	4	40	15	1	Black-Oxide 1215 Carbon Steel	Brinell 167	0000000	00000

Bearing Retaining Nuts

Chamfered

Often paired with spring lock washers to strengthen their hold, these retaining nuts—also known as shaft nuts—keep vibration from shifting bearings, bushings, pulleys, and gears on your threaded shaft or spindle. They have slotted sides, so you can tighten and loosen them with a spanner wrench or spanner socket. Made of carbon steel, they’re strong and wear resistant.

Chamfered-face retaining nuts weigh less and produce less heat than stepped-face nuts. They meet ISO 2982 (formerly DIN 981), an international standard for bearing locknut dimensions. Their sizes correspond to SKF KM series. Use them with DIN 5406 spring lock washers.

For technical drawings and 3-D models, click on a part number.

Nuts
Thread									Optional Washers
Size	Pitch, mm	Spacing	OD, mm	Wd., mm	Specifications Met	For Lock Washer Specifications Met		Each		Each
Carbon Steel
Chamfered Face
M220	4	Extra Fine	280	32	DIN 981, ISO 2982	DIN 5406	0000000	0000000	000000000	0000000
M240	4	Extra Fine	300	34	DIN 981, ISO 2982	DIN 5406	0000000	000000	000000	00
M260	4	Extra Fine	330	36	DIN 981, ISO 2982	DIN 5406	0000000	000000	000000	00
M280	4	Extra Fine	350	38	DIN 981, ISO 2982	DIN 5406	0000000	000000	000000	00

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Selecting Compatible Lead Screws and Nuts

About Shaft Collars

About Washers

Metric Lead Screws and Nuts

Metric Precision Lead Screws and Nuts

Metric Fast-Travel Ultra-Precision Lead Screws and Nuts

Metric Ultra-Precision Lead Screws and Nuts

Metric Clamping Lead Screw Collars

Bearing Retaining Nuts