3/8"-16 Lead Screws | McMaster-Carr

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36 Products

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.

Black-Oxide 4140 Alloy Steel—Black-oxide alloy steel lead screws are hard and strong. They have mild corrosion resistance and a dark surface color.

304 Stainless Steel—304 stainless steel lead screws have good 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.

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



	3/8"-16	18"	Acme	1:1	1	0.063"	±0.009"/1 ft.	Acme Class 2C	Not Rated	Not Rated	99030A996	000000


	3/8"-16	3 ft.	Acme	1:1	1	0.063"	±0.009"/1 ft.	Acme Class 2C	Brinell 126	64,000	99030A334	00000
	3/8"-16	6 ft.	Acme	1:1	1	0.063"	±0.009"/1 ft.	Acme Class 2C	Brinell 126	64,000	99030A734	00000


	Black-Oxide 4140 Alloy Steel



			3/8"-16	3 ft.	Acme	1:1	1	0.063"	±0.009"/1 ft.	Acme Class 2C	Brinell 271	125,000	98940A619	00000


			3/8"-16	6 ft.	Acme	1:1	1	0.063"	±0.009"/1 ft.	Acme Class 2C	Brinell 271	125,000	98940A016	000000


			304 Stainless Steel



					3/8"-16	18"	Acme	1:1	1	0.063"	±0.009"/1 ft.	Acme Class 2C	Not Rated	Not Rated	98980A977	00000


					3/8"-16	3 ft.	Acme	1:1	1	0.063"	±0.009"/1 ft.	Acme Class 2C	Brinell 150	72,000	98980A126	00000
					3/8"-16	6 ft.	Acme	1:1	1	0.063"	±0.009"/1 ft.	Acme Class 2C	Brinell 150	72,000	98980A350	000000

Lead Screws—Left-Hand Thread


	Left-Hand Threads

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

Black-Oxide 4140 Alloy Steel—Black-oxide alloy steel lead screws are hard and strong. They have mild corrosion resistance and a dark surface color.

304 Stainless Steel—304 stainless steel lead screws have good 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.

	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, psi		Each
1018 Low-Carbon Steel



	3/8"-16	3	Acme	1:1	1	0.063"	±0.009"/1 ft.	Acme Class 2C	Brinell 126	64,000	99030A534	000000


	3/8"-16	6	Acme	1:1	1	0.063"	±0.009"/1 ft.	Acme Class 2C	Brinell 126	64,000	99030A434	000000


	Black-Oxide 4140 Alloy Steel



			3/8"-16	3	Acme	1:1	1	0.063"	±0.009"/1 ft.	Acme Class 2C	Brinell 271	125,000	98940A719	00000


			3/8"-16	6	Acme	1:1	1	0.063"	±0.009"/1 ft.	Acme Class 2C	Brinell 271	125,000	98940A316	000000


			304 Stainless Steel



					3/8"-16	3	Acme	1:1	1	0.063"	±0.009"/1 ft.	Acme Class 2C	Brinell 150	72,000	98980A225	00000


					3/8"-16	6	Acme	1:1	1	0.063"	±0.009"/1 ft.	Acme Class 2C	Brinell 150	72,000	98980A006	000000

Round Nuts—Right-Hand Thread

Iron—Iron nuts have good machinability and high strength.

932 Bearing 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.

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



	3/8"-16	3/4"	1.344"	Acme	1:1	1	0.063"	Acme Class 2C	Brinell 217	Not Rated	Not Rated	—	95365A529	000000


	932 Bearing Bronze



			3/8"-16	3/4"	1.344"	Acme	1:1	1	0.063"	Acme Class 2C	Brinell 65	Not Rated	700	—	1343K39	00000


			PET



					3/8"-16	3/4"	1.344"	Acme	1:1	1	0.063"	Acme Class 2C	Not Rated	Not Rated	350	15 to 175	1349K39	00000

Round Nuts—Left-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



	3/8"-16	3/4"	1.344"	Acme	1:1	1	0.063"	Acme Class 2C	Brinell 217	Not Rated	Not Rated	95365A629	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.

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



		3/8"-16	5/8"	0.688"	Acme	1:1	1	0.063"	9/16"-18	3/8"	Acme Class 2C	Brinell 70	Not Rated	Not Rated	—	95072A129	000000


		PET



				3/8"-16	5/8"	0.688"	Acme	1:1	1	0.063"	9/16"-18	3/8"	Acme Class 2C	Not Rated	Not Rated	350	15 to 175	95075A229	00000

Flanges

Image of Attribute. Front orientation. Contains Annotated.

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.

1215 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
Black-Oxide 1117 Carbon Steel



	9/16"-18	1 39/64"	13/32"	1 1/8"	Brinell 135	1329K101	000000


	1215 Carbon Steel



			9/16"-18	1 39/64"	13/32"	1 1/8"	Not Rated	95082A641	00000


			303 Stainless Steel



					9/16"-18	1 39/64"	13/32"	1 1/8"	Brinell 140	1329K11	00000

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 1215 Carbon Steel—Black-oxide carbon steel collars have mild corrosion resistance.

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

	No. of Thread Starts	Hardness		Each
Right-Hand Thread







	Black-Oxide 1215 Carbon Steel

	3/8"-16	7/8"	11/32"	1	Brinell 167	6698K52	000000




			303 Stainless Steel

			3/8"-16	7/8"	11/32"	1	Brinell 228	2228N23	00000

Two-Piece Clamping Acme Lead Screw Collars

Mount these two-piece collars anywhere on an Acme lead screw without removing components. Use them to separate and position components or 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 1215 Carbon Steel—Black-oxide carbon steel collars have mild corrosion resistance.

	No. of Thread Starts	Hardness		Each
Right-Hand Thread







	Black-Oxide 1215 Carbon Steel

	3/8"-16	7/8"	11/32"	1	Brinell 167	2207N12	000000

Stepper Motors with Linear Actuation

Instead of a shaft, these stepper motors have a lead screw that converts rotational motion to linear motion. Moving in increments smaller than the thickness of a sheet of paper, they're ideal for applications that require fine motion control, such as positioning electrical components on a circuit board. They move in equal steps and hold their position when stationary, so they do not require encoders, sensors, or other position feedback devices. The lead screw is built into the motor, so there are fewer points of failure than systems that use a shaft coupling to connect the lead screw. All are bipolar hybrid stepper motors, which deliver greater torque, precision, and efficiency than other types of stepper motors.

All motors require a controller and drive (not included).

External Lead Screw—External lead screw stepper motors work similar to a traditional linear motion system; attach the load to the flanged nut, which travels back and forth along the lead screw.

Pass-Through Lead Screw—Pass-through lead screw stepper motors give you the most design versatility because there are two ways to move your load: on the motor body or on the ends of the lead screw. The motor moves when the lead screw is fixed or the lead screw moves when the motor body is fixed.

Travel Distance per Full Step—Travel distance per full step determines the control you have over the motor’s positioning. The smaller the measurement, the finer positioning control you have, but the more steps it will take to go the same distance.

Dynamic Load Capacity—Dynamic load capacity is the maximum load a motor can move. If you increase the speed, the dynamic load capacity decreases. Click on a part number and select "Product Detail" to view the load-speed chart and confirm the motor will work for your application.

Full Step Increment—Full step increment is the rotation of the shaft from one position to the next. A smaller full step increment means the rotor has more teeth, producing smoother and more precise motion. 1.8° is considered standard.

									Overall					Temp. Range, ° F
	Travel Distance per Full Step	Travel Lg.	Dynamic Load Cap., lb.	Max. Speed, in/sec	Max. Current per Phase, amp	Full Step Increment	Stepper Motor Polarity	No. of Wire Leads	Lg.	Wd.	Ht.	Lead Screw Lg.	Thread Size	Min.	Max.		Each
External Lead Screw







				NEMA 23 Frame Size

				0.0001562"	5"	90	0.2	2	0.9°	Bipolar	4	7.8"	2.3"	2.3"	6"	3/8"-16	35	130	8677N57	0000000


				0.0001562"	11"	90	0.2	2	0.9°	Bipolar	4	13.8"	2.3"	2.3"	12"	3/8"-16	35	130	8677N58	000000
				0.0003125"	5"	200	0.4	2	1.8°	Bipolar	4	7.8"	2.3"	2.3"	6"	3/8"-16	35	130	8677N59	000000
				0.0003125"	11"	200	0.5	2	1.8°	Bipolar	4	13.8"	2.3"	2.3"	12"	3/8"-16	35	130	8677N28	000000
				0.0003125"	15"	200	0.4	2	1.8°	Bipolar	4	17.8"	2.3"	2.3"	16"	3/8"-16	35	130	8677N61	000000


				Pass-Through Lead Screw







								NEMA 23 Frame Size

								0.0001562"	4.1"	90	0.2	2	0.9°	Bipolar	4	6.5"	2.3"	2.3"	6"	3/8"-16	35	130	8677N93	000000


								0.0001562"	10.1"	90	0.2	2	0.9°	Bipolar	4	12.5"	2.3"	2.3"	12"	3/8"-16	35	130	8677N94	000000
								0.0003125"	4.1"	200	0.4	2	1.8°	Bipolar	4	6.5"	2.3"	2.3"	6"	3/8"-16	35	130	8677N95	000000
								0.0003125"	10.2"	200	0.5	2	1.8°	Bipolar	4	12.5"	2.3"	2.3"	12"	3/8"-16	35	130	8677N36	000000
								0.0003125"	22.1"	200	0.4	2	1.8°	Bipolar	4	24.5"	2.3"	2.3"	24"	3/8"-16	35	130	8677N96	000000