2"-4 Couplings | McMaster-Carr

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Tensile Strength

40,000 psi to 99,999 psi

Not Rated

Thread Fit

Acme Class 2C

Acme Class 2G

Travel Distance per Turn

0.25"

Number of Thread Starts

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

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Flange Material

Specifications Met

18 Products

Acme Lead Screws and Nuts

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, thread size, and number of thread starts.

Coupling Nuts—Right-Hand Thread

Coupling nuts connect two lead screws.

Carbon Steel—Carbon steel components are easier to machine than alloy steel components.

18-8 Stainless Steel—18-8 stainless steel components have good corrosion resistance.

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

	Thread Type	Ht.	Wd.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness	Tensile Strength		Each
Carbon Steel



	2"-4	Acme	4"	3"	1	1:1	0.25"	Acme Class 2G	Rockwell B75	Not Rated	93023A675	0000000


	18-8 Stainless Steel



			2"-4	Acme	4"	3"	1	1:1	0.25"	Acme Class 2G	Not Rated	Not Rated	93030A129	000000

Coupling Nuts—Left-Hand Thread

Coupling nuts connect two lead screws.

Carbon Steel—Carbon steel components are easier to machine than alloy steel components.

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

	Thread Type	Ht.	Wd.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness	Tensile Strength		Each
Carbon Steel



	2"-4	Acme	4"	3"	1	1:1	0.25"	Acme Class 2G	Rockwell B75	Not Rated	93026A318	0000000

Flange Nuts—Right-Hand Thread

Flange nuts move objects along the length of a lead screw. Flange nuts have a wide machinable flange for custom mounting.

932 Bearing Bronze—932 bearing bronze components are more wear resistant than brass components. They have good machinability and fair corrosion resistance.

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

					Flange
	Thread Size	Thread Type	Ht.	Dia.	Dia.	Thk.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness	Tensile Strength		Each
932 Bearing Bronze



		2"-4	Acme	4"	3"	4"	1"	1	1:1	0.25"	Acme Class 2G	Not Rated	Not Rated	95120A191	0000000

Flange Nuts—Left-Hand Thread

Flange nuts move objects along the length of a lead screw. Flange nuts have a wide machinable flange for custom mounting.

932 Bearing Bronze—932 bearing bronze components are more wear resistant than brass components. They have good machinability and fair corrosion resistance.

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

					Flange
	Thread Size	Thread Type	Ht.	Dia.	Dia.	Thk.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness	Tensile Strength		Each
932 Bearing Bronze



		2"-4	Acme	4"	3"	4"	1"	1	1:1	0.25"	Acme Class 2G	Not Rated	Not Rated	95120A591	0000000

Round Nuts—Right-Hand Thread

Round nuts move objects along the length of a lead screw.

932 Bearing Bronze—932 bearing bronze components are more wear resistant than brass components. They have good machinability and fair corrosion resistance.

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

	Thread Type	Ht.	Dia.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness	Tensile Strength	Specs. Met		Each
932 Bearing Bronze



	2"-4	Acme	4 1/64"	3 9/32"	1	1:1	0.25"	Acme Class 2G	Not Rated	Not Rated	ASTM B505	95090A136	0000000

Hex Nuts—Right-Hand Thread

Hex nuts fasten and position lead screw components.

Carbon Steel—Carbon steel components are easier to machine than alloy steel components.

Zinc-Plated Carbon Steel—Zinc-plated carbon steel components have mild corrosion resistance and are easier to machine than alloy steel components.

360 Brass—360 brass components have excellent machinability and good corrosion resistance.

18-8 Stainless Steel—18-8 stainless steel components have good corrosion resistance.

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

	Thread Type	Ht.	Wd.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness	Tensile Strength	Specs. Met		Each
Carbon Steel



	2"-4	Acme	1 31/32"	3"	1	1:1	0.25"	Acme Class 2G	Rockwell B75	Not Rated	—	94815A114	000000


	Zinc-Plated Carbon Steel



			2"-4	Acme	1 31/32"	3"	1	1:1	0.25"	Acme Class 2G	Rockwell B75	Not Rated	—	98948A131	000000


			360 Brass



					2"-4	Acme	2"	3"	1	1:1	0.25"	Acme Class 2G	Rockwell B75	Not Rated	ASTM B16	95155A171	000000


					18-8 Stainless Steel



							2"-4	Acme	1 31/32"	3"	1	1:1	0.25"	Acme Class 2G	Not Rated	Not Rated	—	95066A233	000000

Hex Nuts—Left-Hand Thread

Hex nuts fasten and position lead screw components.

Carbon Steel—Carbon steel components are easier to machine than alloy steel components.

360 Brass—360 brass components have excellent machinability and good corrosion resistance.

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

	Thread Type	Ht.	Wd.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Fastener Strength Grade/Class	Hardness	Tensile Strength, psi	Specs. Met		Each
Carbon Steel



	2"-4	Acme	2"	3"	1	1:1	0.25"	Acme Class 2G	SAE Grade 2	Rockwell B85	64,000	—	91808A114	000000


	360 Brass



			2"-4	Acme	2"	3"	1	1:1	0.25"	Acme Class 2G	—	Rockwell B75	Not Rated	ASTM B16	95155A371	000000

Square Nuts—Right-Hand Thread

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—360 brass components have excellent machinability and good corrosion resistance.

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

	Thread Type	Ht.	Wd.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness	Tensile Strength	Specs. Met		Each
360 Brass



	2"-4	Acme	2"	3"	1	1:1	0.25"	Acme Class 2G	Rockwell B55	Not Rated	ASTM B16	95270A171	0000000

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, please select components that have the same thread direction, thread size, and number of thread starts.

Externally Threaded Nuts—Right-Hand Thread

Image of Product. Front orientation. Contains Annotated. Precision Lead Screws and Nuts. Precision Acme Lead Screws and Nuts, Externally Threaded Nuts—Right-Hand Thread.

Combine externally threaded nuts with a flange to create a custom flange nut.

673 Bronze—932 bearing bronze and 673 bronze nuts are wear resistant. They have good machinability and fair corrosion resistance.

PET—PET plastic nuts are lightweight and corrosion resistant.

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

								External Thread
	Thread Size	Lg.	Dia.	Thread Type	Speed Ratio	No. of Thread Starts	Travel Distance per Turn	Size	Lg.	Thread Fit	Hardness	Tensile Strength	Dynamic Thrust Load Cap., lb.	Temp., ° F		Each
673 Bronze



		2"-4	2 3/4"	2.75"	Acme	1:1	1	0.25"	2 35/64"-18	7/8"	Acme Class 2C	Brinell 70	Not Rated	Not Rated	—	95072A122	0000000


		PET



				2"-4	3 15/32"	2.75"	Acme	1:1	1	0.25"	2 35/64"-18	7/8"	Acme Class 2C	Not Rated	Not Rated	10,000	15 to 175	95075A222	000000

Externally Threaded Nuts—Left-Hand Thread

Combine externally threaded nuts with a flange to create a custom flange nut.

673 Bronze—932 bearing bronze and 673 bronze nuts are wear resistant. They have good machinability and fair corrosion resistance.

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

								External Thread
	Thread Size	Lg.	Dia.	Thread Type	Speed Ratio	No. of Thread Starts	Travel Distance per Turn	Size	Lg.	Thread Fit	Hardness	Tensile Strength	Dynamic Thrust Load Cap.		Each
673 Bronze



		2"-4	2 3/4"	2.75"	Acme	1:1	1	0.25"	2 35/64"-18	7/8"	Acme Class 2C	Brinell 70	Not Rated	Not Rated	95072A226	0000000

Flanges

Image of Attribute. Front orientation. Contains Annotated.

Thread onto an externally threaded acme nut to create a custom flange nut.

1117 Carbon Steel—Carbon steel flanges have good machinability. However, they will rust when exposed to moisture.

303 Stainless Steel—303 stainless steel flanges have good corrosion resistance.

	Flange Dia.	Flange Thk.	Bolt Circle Dia.	Flange Hardness		Each
1117 Carbon Steel



	2 35/64"-18	4 15/16"	29/32"	4 1/16"	Brinell 156	95082A646	000000


	303 Stainless Steel



			2 35/64"-18	4 15/16"	29/32"	4 1/16"	Brinell 140	1329K16	000000