7/8"-6 Threaded Rods | McMaster-Carr

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45 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.

Lead Screws—Right-Hand Thread

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

Alloy Steel—Alloy steel components are harder and stronger than carbon steel components.

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

316 Stainless Steel—316 stainless steel components have excellent 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	Lg.	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



	7/8"-6	Acme	12"	1	1:1	0.167"	Acme Class 2G	SAE Grade 2	Rockwell B61	64,000	ASTM A108	98935A739	000000


	7/8"-6	Acme	3 ft.	1	1:1	0.167"	Acme Class 2G	SAE Grade 2	Rockwell B61	64,000	ASTM A108	98935A846	00000
	7/8"-6	Acme	6 ft.	1	1:1	0.167"	Acme Class 2G	SAE Grade 2	Rockwell B61	53,000	ASTM A108	98935A037	00000
	7/8"-6	Acme	12 ft.	1	1:1	0.167"	Acme Class 2G	SAE Grade 2	Rockwell B61	64,000	ASTM A108	98935A662	00000


	Alloy Steel



			7/8"-6	Acme	12"	1	1:1	0.167"	Acme Class 2G	ASTM Grade B7	Rockwell C35	125,000	ASTM A193	93410A948	00000


			7/8"-6	Acme	3 ft.	1	1:1	0.167"	Acme Class 2G	ASTM Grade B7	Rockwell C35	125,000	ASTM A193	93410A630	00000
			7/8"-6	Acme	6 ft.	1	1:1	0.167"	Acme Class 2G	ASTM Grade B7	Rockwell C35	125,000	ASTM A193	93410A160	000000


			18-8 Stainless Steel



					7/8"-6	Acme	12"	1	1:1	0.167"	Acme Class 2G	—	Rockwell B96	Not Rated	—	95061A633	00000


					7/8"-6	Acme	3 ft.	1	1:1	0.167"	Acme Class 2G	—	Rockwell B96	Not Rated	—	95061A837	000000
					7/8"-6	Acme	6 ft.	1	1:1	0.167"	Acme Class 2G	—	Rockwell B96	Not Rated	—	95061A193	000000
					7/8"-6	Acme	12 ft.	1	1:1	0.167"	Acme Class 2G	—	Rockwell B96	Not Rated	—	95061A947	000000


					316 Stainless Steel



							7/8"-6	Acme	12"	1	1:1	0.167"	Acme Class 2G	ASTM Grade B8M	Rockwell B97	75,000	ASTM A193	97014A637	00000


							7/8"-6	Acme	3 ft.	1	1:1	0.167"	Acme Class 2G	ASTM Grade B8M	Rockwell B97	75,000	ASTM A193	97014A638	000000
							7/8"-6	Acme	6 ft.	1	1:1	0.167"	Acme Class 2G	ASTM Grade B8M	Rockwell B97	75,000	ASTM A193	97014A639	000000

Lead Screws—Left-Hand Thread

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

Alloy Steel—Alloy steel components are harder and stronger than carbon 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	Lg., ft.	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



	7/8"-6	Acme	3	1	1:1	0.167"	Acme Class 2G	SAE Grade 2	Rockwell B61	53,000	ASTM A108	98935A459	000000


	7/8"-6	Acme	6	1	1:1	0.167"	Acme Class 2G	SAE Grade 2	Rockwell B61	53,000	ASTM A108	98935A460	00000


	Alloy Steel



			7/8"-6	Acme	3	1	1:1	0.167"	Acme Class 2G	ASTM Grade B7	Rockwell C35	125,000	ASTM A193	93410A464	000000


			7/8"-6	Acme	6	1	1:1	0.167"	Acme Class 2G	ASTM Grade B7	Rockwell C35	125,000	ASTM A193	93410A465	000000

Hex-Head Screws—Right-Hand Thread

Hex head screws fasten heavy loads. They’re generally shorter than lead screws and can be tightened with a wrench. Length is measured from under the head.

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.

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



		7/8"-6	Acme	3"	1	1:1	0.167"	2 1/2" to 3"	1 5/16"	35/64"	Acme Class 2G	SAE Grade 5	Rockwell C19	105,000	93097A270	000000


		7/8"-6	Acme	4"	1	1:1	0.167"	3 1/2" to 4"	1 5/16"	35/64"	Acme Class 2G	SAE Grade 5	Rockwell C19	105,000	93097A280	00000
		7/8"-6	Acme	6"	1	1:1	0.167"	5 1/2" to 6"	1 5/16"	35/64"	Acme Class 2G	SAE Grade 5	Rockwell C19	105,000	93097A290	00000

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



	7/8"-6	Acme	2 1/2"	1 1/4"	1	1:1	0.167"	Acme Class 2G	Rockwell B75	Not Rated	93023A665	000000


	18-8 Stainless Steel



			7/8"-6	Acme	2 1/2"	1 1/4"	1	1:1	0.167"	Acme Class 2G	Not Rated	Not Rated	93030A115	00000

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



	7/8"-6	Acme	2 1/2"	1 1/4"	1	1:1	0.167"	Acme Class 2G	Rockwell B75	Not Rated	93026A304	000000

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



		7/8"-6	Acme	1 3/4"	1 1/4"	2 1/4"	1/2"	1	1:1	0.167"	Acme Class 2G	Not Rated	Not Rated	95120A143	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



		7/8"-6	Acme	1 3/4"	1 1/4"	2 1/4"	1/2"	1	1:1	0.167"	Acme Class 2G	Not Rated	Not Rated	95120A543	0000000

Round Nuts—Right-Hand Thread

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

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

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
360 Brass



	7/8"-6	Acme	7/8"	1 1/2"	1	1:1	0.167"	Acme Class 2G	Rockwell B55	Not Rated	ASTM B16	95100A117	000000


	932 Bearing Bronze



			7/8"-6	Acme	1 17/32"	1 21/32"	1	1:1	0.167"	Acme Class 2G	Not Rated	Not Rated	ASTM B505	95090A503	00000

Round Nuts—Left-Hand Thread

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

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



	7/8"-6	Acme	7/8"	1 1/2"	1	1:1	0.167"	Acme Class 2G	Rockwell B55	Not Rated	ASTM B16	95100A417	000000

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



	7/8"-6	Acme	55/64"	1 7/16"	1	1:1	0.167"	Acme Class 2G	Rockwell B75	Not Rated	—	94815A123	00000


	Zinc-Plated Carbon Steel



			7/8"-6	Acme	55/64"	1 7/16"	1	1:1	0.167"	Acme Class 2G	Rockwell B75	Not Rated	—	98948A119	00000


			360 Brass



					7/8"-6	Acme	7/8"	1 1/2"	1	1:1	0.167"	Acme Class 2G	Rockwell B75	Not Rated	ASTM B16	95155A143	00000


					18-8 Stainless Steel



							7/8"-6	Acme	55/64"	1 1/2"	1	1:1	0.167"	Acme Class 2G	Not Rated	Not Rated	—	95066A226	00000

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.

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	Fastener Strength Grade/Class	Hardness	Tensile Strength, psi	Specs. Met		Each
Carbon Steel



	7/8"-6	Acme	55/64"	1 7/16"	1	1:1	0.167"	Acme Class 2G	SAE Grade 2	Rockwell B85	64,000	—	91808A120	000000


	360 Brass



			7/8"-6	Acme	7/8"	1 1/2"	1	1:1	0.167"	Acme Class 2G	—	Rockwell B75	Not Rated	ASTM B16	95155A343	00000


			18-8 Stainless Steel



					7/8"-6	Acme	55/64"	1 1/2"	1	1:1	0.167"	Acme Class 2G	—	Not Rated	Not Rated	—	95066A426	00000

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



	7/8"-6	Acme	7/8"	1 1/2"	1	1:1	0.167"	Acme Class 2G	Rockwell B55	Not Rated	ASTM B16	95270A143	000000

Square Nuts—Left-Hand Thread

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



	7/8"-6	Acme	7/8"	1 1/2"	1	1:1	0.167"	Acme Class 2G	Rockwell B55	Not Rated	ASTM B16	95270A543	000000

Flat Handles—Right-Hand Thread

Handles fasten and position lead screw components. Handles are easy to grip and tighten by hand for quick assembly and disassembly.

Cast Iron—Cast iron components have good machinability and high strength.

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
Cast Iron



	7/8"-6	Acme	1 1/8"	9 1/2"	1	1:1	0.167"	Acme Class 2G	Rockwell B72	Not Rated	92428A744	000000

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.

Lead Screws—Right-Hand Thread


	Right-Hand Threads

1018 Low-Carbon Steel—Carbon steel lead screws and flanges have good machinability.

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.

	Lg., ft.	Thread Type	Speed Ratio	No. of Thread Starts	Travel Distance per Turn	Accuracy for Travel Distance per Turn	Thread Fit	Hardness	Tensile Strength		Each
1018 Low-Carbon Steel



	7/8"-6	3	Acme	1:1	1	0.167"	±0.009"/1 ft.	Acme Class 2C	Not Rated	Not Rated	99030A966	000000


	7/8"-6	6	Acme	1:1	1	0.167"	±0.009"/1 ft.	Acme Class 2C	Not Rated	Not Rated	99030A967	000000

Round Nuts—Right-Hand Thread

Iron—Iron nuts have good machinability and high strength.

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.

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



	7/8"-6	2"	2.985"	Acme	1:1	1	0.167"	Acme Class 2C	Not Rated	Not Rated	Not Rated	95365A631	000000

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.

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



		7/8"-6	1 1/2"	1.5"	Acme	1:1	1	0.167"	1 3/8"-16	1/2"	Acme Class 2C	Not Rated	Not Rated	Not Rated	95072A883	000000

Flanges

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

Black-Oxide 1117 Carbon Steel—Black-oxide carbon steel flanges have mild corrosion resistance in dry environments and a dark surface color.

	Flange Dia.	Flange Thk.	Bolt Circle Dia.	Flange Hardness		Each
Black-Oxide 1117 Carbon Steel



	1 3/8"-16	2 49/64"	33/64"	2 17/64"	Brinell 135	1329K104	000000

Clamping Acme Lead Screw Collars

Thread these one-piece collars onto an Acme lead screw to separate and position components, or use them as an end stop to limit travel. Tighten the clamping screw to secure.

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

Black-Oxide 12L14 Carbon Steel—Black-oxide carbon steel collars have mild corrosion resistance.

	No. of Thread Starts	Hardness		Each
Right-Hand Thread







	Black-Oxide 12L14 Carbon Steel

	7/8"-6	2 1/8"	5/8"	1	Brinell 163	6698K16	000000