5/8"-6 Threaded Rods | McMaster-Carr

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27 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.

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



	5/8"-6	Acme	12"	1	1:1	0.167"	Acme Class 2G	SAE Grade 2	Rockwell B61	64,000	ASTM A108	98935A721	00000


	5/8"-6	Acme	3 ft.	1	1:1	0.167"	Acme Class 2G	SAE Grade 2	Rockwell B61	64,000	ASTM A108	98935A827	00000
	5/8"-6	Acme	6 ft.	1	1:1	0.167"	Acme Class 2G	SAE Grade 2	Rockwell B61	64,000	ASTM A108	98935A034	00000


	Alloy Steel



			5/8"-6	Acme	12"	1	1:1	0.167"	Acme Class 2G	ASTM Grade B7	Rockwell C35	125,000	ASTM A193	93410A928	00000


			5/8"-6	Acme	3 ft.	1	1:1	0.167"	Acme Class 2G	ASTM Grade B7	Rockwell C35	125,000	ASTM A193	93410A617	00000
			5/8"-6	Acme	6 ft.	1	1:1	0.167"	Acme Class 2G	ASTM Grade B7	Rockwell C35	125,000	ASTM A193	93410A325	000000


			18-8 Stainless Steel



					5/8"-6	Acme	12"	1	1:1	0.167"	Acme Class 2G	—	Rockwell B96	Not Rated	—	95061A618	00000


					5/8"-6	Acme	3 ft.	1	1:1	0.167"	Acme Class 2G	—	Rockwell B96	Not Rated	—	95061A823	00000
					5/8"-6	Acme	6 ft.	1	1:1	0.167"	Acme Class 2G	—	Rockwell B96	Not Rated	—	95061A528	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



	5/8"-6	Acme	3	1	1:1	0.167"	Acme Class 2G	SAE Grade 2	Rockwell B61	64,000	ASTM A108	98935A426	000000


	5/8"-6	Acme	6	1	1:1	0.167"	Acme Class 2G	SAE Grade 2	Rockwell B61	64,000	ASTM A108	98935A427	00000


	Alloy Steel



			5/8"-6	Acme	3	1	1:1	0.167"	Acme Class 2G	ASTM Grade B7	Rockwell C35	125,000	ASTM A193	93410A429	000000


			5/8"-6	Acme	6	1	1:1	0.167"	Acme Class 2G	ASTM Grade B7	Rockwell C35	125,000	ASTM A193	93410A430	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.

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



	5/8"-6	Acme	39/64"	1 1/16"	1	1:1	0.167"	Acme Class 2G	Rockwell B75	Not Rated	94815A029	00000


	Zinc-Plated Carbon Steel



			5/8"-6	Acme	39/64"	1 1/16"	1	1:1	0.167"	Acme Class 2G	Rockwell B75	Not Rated	98948A116	00000


			18-8 Stainless Steel



					5/8"-6	Acme	39/64"	1 1/16"	1	1:1	0.167"	Acme Class 2G	Rockwell B97	Not Rated	95066A141	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.

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		Each
Carbon Steel



	5/8"-6	Acme	39/64"	1 1/16"	1	1:1	0.167"	Acme Class 2G	SAE Grade 2	Rockwell B85	64,000	91808A027	00000


	18-8 Stainless Steel



			5/8"-6	Acme	39/64"	1 1/16"	1	1:1	0.167"	Acme Class 2G	—	Rockwell B97	Not Rated	95066A371	00000

Fast-Travel Ultra-Precision Lead Screws and Nuts


	Style B	Style C

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 Precision Acme Lead Screws and Nuts, these lead screws and nuts provide increased nut life and more reliable movement in automated systems. All components are corrosion resistant for use in harsh environments. To ensure compatibility, select components that have the same thread type, thread size, and number of thread starts.

Lead Screws—Right-Hand Thread

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	Hardness	Tensile Strength, psi		Each
303 Stainless Steel



	5/8"-6	3	Rounded Acme	12:1	12	2"	±0.0006"/1"	Brinell 160	90,000	6350K721	0000000


	5/8"-6	6	Rounded Acme	12:1	12	2"	±0.0006"/1"	Brinell 160	90,000	6350K102	000000

Flange Nuts—Right-Hand Thread


Style B	Style C


Style B	Style C

Acetal—Acetal nuts have good wear and corrosion resistance.

Wear-Compensating Spring—Flange nuts with wear-compensating internal O-ring or wear-compensating spring maintain a tight fit even when their threads begin to wear. They resist backlash to maintain accuracy over time, which is important in positioning applications such as 3D printing and robotics.

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.

					Flange
	Style	Thread Size	Lg.	Dia.	Dia.	Thk.	Thread Type	Speed Ratio	Bolt Circle Dia.	No. of Thread Starts	Travel Distance per Turn	Hardness	Tensile Strength, psi	Dynamic Thrust Load Cap., lb.	No. of Mounting Holes		Each
Acetal



		B	5/8"-6	1 1/2"	0.875"	1 1/2"	3/16"	Rounded Acme	12:1	1 3/16"	12	2"	Not Rated	9,700	220	3	6350K139	000000


		Acetal with Wear-Compensating Spring



				C	5/8"-6	2"	1.063"	1 51/64"	17/64"	Rounded Acme	12:1	1 3/8"	12	2"	Not Rated	9,700	35	3	6350K177	00000

Self-Stopping Ball Screws and Nuts

Stop Pin Shown Installed

Keep your ball screw spinning without the ball nut damaging your system—a clutch-like collar inside the ball nut prevents it from travelling past the stop pins. Install the included stop pins anywhere along the length of the ball screw by drilling a hole in the valley of the threads (also known as the root) and pressing in the stop pin. When the collar meets the stop pin, the ball nut disengages from the threads and begins to idle. To start the ball nut travelling again, spin the ball screw in the opposite direction. All components are black-oxide steel and have mild corrosion resistance. To ensure compatibility, select components that have the same thread 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—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., ft.	No. of Thread Starts	Travel Distance per Turn	Root Dia.	Hardness	Tensile Strength, psi	Temp. Range, ° F	No. of Pins Included		Each
Black-Oxide Alloy Steel



	5/8"-6	1	2	0.188"	0.562"	Rockwell C56	95,000	-65 to 300	2	2385N11	0000000


	5/8"-6	2	2	0.188"	0.562"	Rockwell C56	95,000	-65 to 300	2	2385N12	000000
	5/8"-6	3	2	0.188"	0.562"	Rockwell C56	95,000	-65 to 300	2	2385N13	000000

Externally Threaded Ball Nuts—Right-Hand Threaded

Image of Product. Front orientation. Contains Annotated. Ball Screws and Nuts. Self-Stopping Ball Screws and Nuts, Ball Nuts, Externally Threaded Nut.

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.	Dia.	No. of Thread Starts	Travel Distance per Turn	External Thread Size	Hardness	Dynamic Thrust Load Cap., lb.	Max. Backlash	Temp. Range, ° F		Each
Black-Oxide Alloy Steel



	5/8"-6	1 7/8"	1"	2	0.188"	15/16"-16	Rockwell C56	300	0.006"	-65 to 300	2385N14	0000000

Flange Ball Nuts—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.

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



		5/8"-6	1 7/8"	1"	2"	13/32"	2	0.188"	1 5/8"	Rockwell C56	300	0.006"	-65 to 300	2385N15	0000000