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Metric Acme

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	System of Measurement System of Measurement

Metric

	Thread Size Thread Size

	Thread Pitch Thread Pitch

	Component Component

	Collar
	Lead Screw
	Nut

	Nut Type Nut Type

	Material Material

Brass

Bronze

Steel

	Thread Direction Thread Direction

	Right Hand

	Travel Distance per Turn Travel Distance per Turn

	Length Length

	Number of Thread Starts Number of Thread Starts

	Thread Fit Thread Fit

Class 7E

Class 7H

Class 8E

	Hardness Hardness

	Speed Ratio Speed Ratio

1:1

	Tensile Strength Tensile Strength

40,000 to 99,999 psi

Not Rated

	Threading Threading

	Fully Threaded

	Specifications Met Specifications Met

ASTM

DIN

ISO

	Height Height

	Width Width

	Diameter Diameter

	Thrust Load Capacity Thrust Load Capacity

Not Rated

	Fastener Strength Grade/Class Fastener Strength Grade/Class

Grade 2

	Flange Material Flange Material

Steel

Bronze

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79 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	Class 7E	Grade 2	Not Rated	ASTM A108, ASTM A193, DIN 103	000000000	000000
M10	2	1,000	1	1:1	2	Class 7E	Grade 2	Not Rated	ASTM A108, ASTM A193, DIN 103	000000000	00000
M12	3	500	1	1:1	3	Class 7E	Grade 2	Not Rated	ASTM A108, ASTM A193, DIN 103	000000000	00000
M12	3	1,000	1	1:1	3	Class 7E	Grade 2	Not Rated	ASTM A108, ASTM A193, DIN 103	000000000	00000
M12	3	2,000	1	1:1	3	Class 7E	Grade 2	Rockwell B72	ASTM A108	000000000	00000
M16	4	500	1	1:1	4	Class 7E	Grade 2	Not Rated	ASTM A108, ASTM A193, DIN 103	000000000	00000
M16	4	1,000	1	1:1	4	Class 7E	Grade 2	Not Rated	ASTM A108, ASTM A193, DIN 103	000000000	00000
M16	4	2,000	1	1:1	4	Class 7E	Grade 2	Rockwell B72	ASTM A108	000000000	000000
M20	4	1,000	1	1:1	4	Class 7E	Grade 2	Not Rated	ASTM A108, ASTM A193, DIN 103	000000000	00000
M20	4	2,000	1	1:1	4	Class 7E	Grade 2	Rockwell B72	ASTM A108	000000000	000000
M26	5	1,000	1	1:1	5	Class 7E	Grade 2	Not Rated	ASTM A108, ASTM A193, DIN 103	000000000	00000
M26	5	2,000	1	1:1	5	Class 7E	Grade 2	Rockwell B72	ASTM A108	000000000	000000
M40	7	1,000	1	1:1	7	Class 7E	Grade 2	Not Rated	ASTM A108, ASTM A193, DIN 103	000000000	000000
M40	7	2,000	1	1:1	7	Class 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	Class 7H	Not Rated	000000000	0000000
M12	3	35	28	48	12	1	1:1	3	Class 7H	Not Rated	000000000	00000
M16	4	35	28	48	12	1	1:1	4	Class 7H	Not Rated	000000000	00000
M20	4	44	32	55	12	1	1:1	4	Class 7H	Not Rated	000000000	00000
M26	5	46	38	62	14	1	1:1	5	Class 7H	Not Rated	000000000	000000
M40	7	66	63	98	16	1	1:1	7	Class 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	Class 7H	Grade 2	Not Rated	000000000	000000
M16	4	16	27	1	1:1	4	Class 7H	Grade 2	Not Rated	000000000	00000
M20	4	20	31.75	1	1:1	4	Class 7H	Grade 2	Not Rated	000000000	00000
M26	5	25.4	41.3	1	1:1	5	Class 7H	Grade 2	Not Rated	000000000	00000
M40	7	39.9	60.33	1	1:1	7	Class 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	Class 7H	Not Rated	000000000	000000
M12	3	25	25	1	1:1	3	Class 7H	Not Rated	000000000	00000
M16	4	35	28	1	1:1	4	Class 7H	Not Rated	000000000	00000
M20	4	50	38	1	1:1	4	Class 7H	Not Rated	000000000	00000

Metric Precision Acme 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	Class 8E	Brinell 150	85,000	DIN 103	0000000	000000
M10	2	500	1	1:1	2	±0.15 mm per 300 mm	Class 8E	Brinell 150	85,000	DIN 103	0000000	00000
M10	2	750	1	1:1	2	±0.15 mm per 300 mm	Class 8E	Brinell 150	85,000	DIN 103	0000000	00000
M10	2	1,750	1	1:1	2	±0.15 mm per 300 mm	Class 8E	Brinell 150	70,000	DIN 103	000000	00000
M12	3	500	1	1:1	3	±0.15 mm per 300 mm	Class 8E	Brinell 150	85,000	DIN 103	0000000	00000
M12	3	1,000	1	1:1	3	±0.15 mm per 300 mm	Class 8E	Brinell 150	85,000	DIN 103	0000000	00000
M12	3	1,750	1	1:1	3	±0.15 mm per 300 mm	Class 8E	Brinell 150	70,000	DIN 103	000000	00000
M16	3	500	1	1:1	3	±0.15 mm per 300 mm	Class 8E	Brinell 150	85,000	DIN 103	0000000	00000
M16	3	1,000	1	1:1	3	±0.15 mm per 300 mm	Class 8E	Brinell 150	85,000	DIN 103	0000000	00000
M16	3	1,750	1	1:1	3	±0.15 mm per 300 mm	Class 8E	Brinell 150	70,000	DIN 103	000000	00000
M20	4	500	1	1:1	4	±0.15 mm per 300 mm	Class 8E	Brinell 150	85,000	DIN 103	0000000	00000
M20	4	1,000	1	1:1	4	±0.15 mm per 300 mm	Class 8E	Brinell 150	85,000	DIN 103	0000000	00000
M20	4	1,750	1	1:1	4	±0.15 mm per 300 mm	Class 8E	Brinell 150	70,000	DIN 103	000000	000000
M24	5	500	1	1:1	5	±0.15 mm per 300 mm	Class 8E	Brinell 150	85,000	DIN 103	0000000	00000
M24	5	1,000	1	1:1	5	±0.15 mm per 300 mm	Class 8E	Brinell 150	85,000	DIN 103	0000000	00000
M24	5	1,750	1	1:1	5	±0.15 mm per 300 mm	Class 8E	Brinell 150	70,000	DIN 103	000000	000000
M28	5	1,000	1	1:1	5	±0.15 mm per 300 mm	Class 8E	Brinell 150	85,000	DIN 103	0000000	00000
M28	5	1,750	1	1:1	5	±0.15 mm per 300 mm	Class 8E	Brinell 150	85,000	DIN 103	0000000	000000
M40	7	1,000	1	1:1	7	±0.15 mm per 300 mm	Class 8E	Brinell 150	85,000	DIN 103	0000000	000000
M40	7	1,750	1	1:1	7	±0.15 mm per 300 mm	Class 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	Class 8E	Brinell 70	Not Rated	670	DIN 103	0000000	000000
M12	3	1"	0.875"	1	1:1	3	Class 8E	Brinell 70	Not Rated	1,100	DIN 103	0000000	00000
M16	3	1 1/8"	1.125"	1	1:1	3	Class 8E	Brinell 70	Not Rated	2,000	DIN 103	0000000	00000
M20	4	1 1/2"	1.25"	1	1:1	4	Class 8E	Brinell 70	Not Rated	3,100	DIN 103	0000000	00000
M24	5	2"	1.75"	1	1:1	5	Class 8E	Brinell 70	Not Rated	4,500	DIN 103	0000000	00000
M28	5	2"	1.75"	1	1:1	5	Class 8E	Brinell 69	44,000	6,100	DIN 103	0000000	00000
M40	7	3"	2.5"	1	1:1	7	Class 8E	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"	Class 8E	Brinell 126	75,000	670	DIN 103	0000000	000000
M12	3	3/4"	1.125"	1	1:1	3	15/16"-16	1/2"	Class 8E	Brinell 126	75,000	1,100	DIN 103	0000000	00000
M16	3	1"	1.125"	1	1:1	3	15/16"-16	1/2"	Class 8E	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"	Class 8E	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"	Class 8E	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"	Class 8E	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"	Class 8E	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"	Class 8E	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"	Class 8E	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"	Class 8E	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"	Class 8E	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"	Class 8E	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"	Class 8E	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"	Class 8E	Brinell 126	Not Rated	12,300	DIN 103	0000000	000000

Metric Clamping Acme Lead Screw Collars

Thread these one-piece collars onto a metric Acme 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

For Chamfered Nuts

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.

Use stepped-face retaining nuts with DIN 462 spring lock washers. You can also use them in pairs or with other bearing retaining nuts as jam nuts. For the nut closer to the bearing, position the stepped face towards the bearing. All meet DIN standards for bearing lockout dimensions.

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 Acme Lead Screws and Nuts

Metric Precision Acme Lead Screws and Nuts

Metric Clamping Acme Lead Screw Collars

Bearing Retaining Nuts