3/8"-12 Fasteners | McMaster-Carr

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



	3/8"-12	Acme	12"	1	1:1	0.083"	Acme Class 2G	SAE Grade 2	Rockwell B61	64,000	ASTM A108	98935A712	00000


	3/8"-12	Acme	3 ft.	1	1:1	0.083"	Acme Class 2G	SAE Grade 2	Rockwell B61	64,000	ASTM A108	98935A817	0000
	3/8"-12	Acme	6 ft.	1	1:1	0.083"	Acme Class 2G	SAE Grade 2	Rockwell B61	53,000	ASTM A108	98935A217	00000
	3/8"-12	Acme	12 ft.	1	1:1	0.083"	Acme Class 2G	SAE Grade 2	Rockwell B61	64,000	ASTM A108	98935A622	00000


	Alloy Steel



			3/8"-12	Acme	6"	1	1:1	0.083"	Acme Class 2G	ASTM Grade B7	Rockwell C35	125,000	ASTM A193	93420A882	00000


			3/8"-12	Acme	12"	1	1:1	0.083"	Acme Class 2G	ASTM Grade B7	Rockwell C35	125,000	ASTM A193	93410A916	00000
			3/8"-12	Acme	2 ft.	1	1:1	0.083"	Acme Class 2G	ASTM Grade B7	Rockwell C35	125,000	ASTM A193	93410A111	00000
			3/8"-12	Acme	3 ft.	1	1:1	0.083"	Acme Class 2G	ASTM Grade B7	Rockwell C35	125,000	ASTM A193	93410A609	00000
			3/8"-12	Acme	6 ft.	1	1:1	0.083"	Acme Class 2G	ASTM Grade B7	Rockwell C35	125,000	ASTM A193	93410A110	000000
			3/8"-12	Acme	12 ft.	1	1:1	0.083"	Acme Class 2G	ASTM Grade B7	Rockwell C35	125,000	ASTM A193	93410A825	000000


			18-8 Stainless Steel



					3/8"-12	Acme	12"	1	1:1	0.083"	Acme Class 2G	—	Rockwell B96	Not Rated	—	95061A609	00000


					3/8"-12	Acme	3 ft.	1	1:1	0.083"	Acme Class 2G	—	Rockwell B96	Not Rated	—	95061A813	00000
					3/8"-12	Acme	6 ft.	1	1:1	0.083"	Acme Class 2G	—	Rockwell B96	Not Rated	—	95061A191	000000
					3/8"-12	Acme	12 ft.	1	1:1	0.083"	Acme Class 2G	—	Rockwell B96	Not Rated	—	95061A923	000000


					316 Stainless Steel



							3/8"-12	Acme	12"	1	1:1	0.083"	Acme Class 2G	ASTM Grade B8M	Rockwell B97	75,000	ASTM A193	97014A634	00000


							3/8"-12	Acme	3 ft.	1	1:1	0.083"	Acme Class 2G	ASTM Grade B8M	Rockwell B97	75,000	ASTM A193	97014A635	00000
							3/8"-12	Acme	6 ft.	1	1:1	0.083"	Acme Class 2G	ASTM Grade B8M	Rockwell B97	75,000	ASTM A193	97014A636	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



	3/8"-12	Acme	3	1	1:1	0.083"	Acme Class 2G	SAE Grade 2	Rockwell B61	53,000	ASTM A108	98935A411	00000


	3/8"-12	Acme	6	1	1:1	0.083"	Acme Class 2G	SAE Grade 2	Rockwell B61	53,000	ASTM A108	98935A410	00000


	Alloy Steel



			3/8"-12	Acme	3	1	1:1	0.083"	Acme Class 2G	ASTM Grade B7	Rockwell C35	125,000	ASTM A193	93410A414	00000


			3/8"-12	Acme	6	1	1:1	0.083"	Acme Class 2G	ASTM Grade B7	Rockwell C35	125,000	ASTM A193	93410A415	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



		3/8"-12	Acme	3"	1	1:1	0.083"	2 1/2" to 3"	9/16"	15/64"	Acme Class 2G	SAE Grade 5	Rockwell C19	105,000	93097A140	000000


		3/8"-12	Acme	4"	1	1:1	0.083"	3 1/2" to 4"	9/16"	15/64"	Acme Class 2G	SAE Grade 5	Rockwell C19	105,000	93097A150	00000
		3/8"-12	Acme	6"	1	1:1	0.083"	5 1/2" to 6"	9/16"	15/64"	Acme Class 2G	SAE Grade 5	Rockwell C19	105,000	93097A160	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.

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



	3/8"-12	Acme	1 7/8"	1/2"	1	1:1	0.083"	Acme Class 2G	Rockwell B75	Not Rated	93023A661	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



		3/8"-12	Acme	7/8"	1/2"	1"	1/8"	1	1:1	0.083"	Acme Class 2G	Not Rated	Not Rated	95120A592	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



	3/8"-12	Acme	3/8"	3/4"	1	1:1	0.083"	Acme Class 2G	Rockwell B55	Not Rated	ASTM B16	95100A101	00000


	932 Bearing Bronze



			3/8"-12	Acme	3/4"	7/8"	1	1:1	0.083"	Acme Class 2G	Not Rated	Not Rated	ASTM B505	95090A502	00000

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



	3/8"-12	Acme	23/64"	11/16"	1	1:1	0.083"	Acme Class 2G	Rockwell B75	Not Rated	—	94815A106	00000


	Zinc-Plated Carbon Steel



			3/8"-12	Acme	23/64"	11/16"	1	1:1	0.083"	Acme Class 2G	Rockwell B75	Not Rated	—	98948A114	00000


			360 Brass



					3/8"-12	Acme	3/8"	3/4"	1	1:1	0.083"	Acme Class 2G	Rockwell B75	Not Rated	ASTM B16	95155A111	0000


					18-8 Stainless Steel



							3/8"-12	Acme	23/64"	11/16"	1	1:1	0.083"	Acme Class 2G	Not Rated	Not Rated	—	95066A208	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



	3/8"-12	Acme	23/64"	11/16"	1	1:1	0.083"	Acme Class 2G	SAE Grade 2	Rockwell B85	64,000	91808A106	00000


	18-8 Stainless Steel



			3/8"-12	Acme	23/64"	11/16"	1	1:1	0.083"	Acme Class 2G	—	Not Rated	Not Rated	95066A408	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



	3/8"-12	Acme	3/8"	3/4"	1	1:1	0.083"	Acme Class 2G	Rockwell B55	Not Rated	ASTM B16	95270A111	00000

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



	3/8"-12	Acme	3/8"	3/4"	1	1:1	0.083"	Acme Class 2G	Rockwell B55	Not Rated	ASTM B16	95270A511	00000

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



	3/8"-12	Acme	1 1/8"	9 1/2"	1	1:1	0.083"	Acme Class 2G	Rockwell B72	Not Rated	92428A741	000000

Offset 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



	3/8"-12	Acme	1 3/4"	4 1/4"	1	1:1	0.083"	Acme Class 2G	Rockwell B67	Not Rated	98890A111	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.

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"-12	18"	Acme	1:1	1	0.083"	±0.009"/1 ft.	Acme Class 2C	Not Rated	Not Rated	99030A992	000000


	3/8"-12	3 ft.	Acme	1:1	1	0.083"	±0.009"/1 ft.	Acme Class 2C	Not Rated	Not Rated	99030A993	00000
	3/8"-12	6 ft.	Acme	1:1	1	0.083"	±0.009"/1 ft.	Acme Class 2C	Not Rated	Not Rated	99030A994	00000


	Black-Oxide 4140 Alloy Steel



			3/8"-12	18"	Acme	1:1	1	0.083"	±0.009"/1 ft.	Acme Class 2C	Brinell 271	125,000	98940A303	00000


			3/8"-12	3 ft.	Acme	1:1	1	0.083"	±0.009"/1 ft.	Acme Class 2C	Brinell 271	125,000	98940A615	00000
			3/8"-12	6 ft.	Acme	1:1	1	0.083"	±0.009"/1 ft.	Acme Class 2C	Brinell 271	125,000	98940A104	000000


			304 Stainless Steel



					3/8"-12	18"	Acme	1:1	1	0.083"	±0.009"/1 ft.	Acme Class 2C	Not Rated	Not Rated	98980A976	00000


					3/8"-12	3 ft.	Acme	1:1	1	0.083"	±0.009"/1 ft.	Acme Class 2C	Brinell 150	72,000	98980A124	00000
					3/8"-12	6 ft.	Acme	1:1	1	0.083"	±0.009"/1 ft.	Acme Class 2C	Brinell 150	72,000	98980A345	000000

Lead Screws—Left-Hand Thread


	Left-Hand Threads

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
Black-Oxide 4140 Alloy Steel



	3/8"-12	3	Acme	1:1	1	0.083"	±0.009"/1 ft.	Acme Class 2C	Brinell 271	125,000	98940A715	000000


	3/8"-12	6	Acme	1:1	1	0.083"	±0.009"/1 ft.	Acme Class 2C	Brinell 271	125,000	98940A404	00000


	304 Stainless Steel



			3/8"-12	3	Acme	1:1	1	0.083"	±0.009"/1 ft.	Acme Class 2C	Brinell 150	72,000	98980A004	00000


			3/8"-12	6	Acme	1:1	1	0.083"	±0.009"/1 ft.	Acme Class 2C	Brinell 150	72,000	98980A005	00000

Lead Screws—Right-Hand and Left-Hand Thread


	Right-Hand-and-Left-Hand Threads

Right-hand-and-left-hand threaded lead screws have right-hand threads on one end and left-hand threads on the other. Use them where you want to drive nuts in opposite directions at the same time, such as for widening and narrowing chutes on packing and assembly lines. Note: A short length of threading at the center of the lead screw is not usable.

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.

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.

					Usable Thread Lg.
	Thread Size	Lg., ft.	Thread Type	Speed Ratio	Right-Hand	Left-Hand	No. of Thread Starts	Travel Distance per Turn	Accuracy for Travel Distance per Turn	Thread Fit	Hardness	Tensile Strength, psi		Each
Black-Oxide 4140 Alloy Steel



		3/8"-12	3	Acme	1:1	17"	17"	1	0.083"	±0.0003"/1"	Acme Class 2C	Brinell 200	95,000	99015A250	0000000

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"-12	3/4"	1.344"	Acme	1:1	1	0.083"	Acme Class 2C	Brinell 217	Not Rated	Not Rated	—	95365A111	000000


	932 Bearing Bronze



			3/8"-12	3/4"	1.344"	Acme	1:1	1	0.083"	Acme Class 2C	Brinell 65	Not Rated	700	—	1343K138	00000


			PET



					3/8"-12	3/4"	1.344"	Acme	1:1	1	0.083"	Acme Class 2C	Not Rated	Not Rated	350	15 to 175	1349K149	00000

Round Nuts—Left-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"-12	3/4"	1.344"	Acme	1:1	1	0.083"	Acme Class 2C	Brinell 217	Not Rated	Not Rated	—	95365A311	000000


	932 Bearing Bronze



			3/8"-12	3/4"	1.344"	Acme	1:1	1	0.083"	Acme Class 2C	Brinell 65	Not Rated	700	—	1343K238	00000


			PET



					3/8"-12	3/4"	1.344"	Acme	1:1	1	0.083"	Acme Class 2C	Not Rated	Not Rated	350	15 to 175	1349K151	00000

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"-12	5/8"	0.688"	Acme	1:1	1	0.083"	9/16"-18	3/8"	Acme Class 2C	Brinell 70	Not Rated	Not Rated	—	95072A108	000000


		PET



				3/8"-12	5/8"	0.688"	Acme	1:1	1	0.083"	9/16"-18	3/8"	Acme Class 2C	Not Rated	Not Rated	350	15 to 175	95075A104	00000

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



		3/8"-12	5/8"	0.688"	Acme	1:1	1	0.083"	9/16"-18	3/8"	Acme Class 2C	Brinell 70	Not Rated	Not Rated	95072A208	000000

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

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 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

	3/8"-12	1 1/8"	1/2"	1	Brinell 163	2224N14	000000

Fast-Travel Precision Acme Lead Screws and Nuts

Multiple thread channels (also known as thread starts) create faster linear travel than lead screws with a single thread start. The threads have a tight thread fit for accurate, repeatable starts and stops. Pair with a motor in automated motion and positioning applications. To ensure compatibility, please select components that have the same thread direction, thread size, and number of thread starts.

Lead Screws—Right-Hand Thread

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.	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"-12	18"	Acme	2:1	2	0.167"	±0.009"/1 ft.	Acme Class 2C	Not Rated	Not Rated	99030A995	000000


	3/8"-12	3 ft.	Acme	2:1	2	0.167"	±0.009"/1 ft.	Acme Class 2C	Brinell 126	64,000	99030A024	00000
	3/8"-12	6 ft.	Acme	2:1	2	0.167"	±0.009"/1 ft.	Acme Class 2C	Brinell 126	64,000	99030A124	00000

Lead Screws—Left-Hand Thread

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, psi		Each
1018 Low-Carbon Steel



	3/8"-12	3	Acme	2:1	2	0.167"	±0.009"/1 ft.	Acme Class 2C	Brinell 126	64,000	99030A424	000000


	3/8"-12	6	Acme	2:1	2	0.167"	±0.009"/1 ft.	Acme Class 2C	Brinell 126	64,000	99030A524	00000

Externally Threaded Nuts—Right-Hand Thread

Image of Product. Front orientation. Contains Annotated. Precision Lead Screws and Nuts. Fast-Travel 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



		3/8"-12	5/8"	0.688"	Acme	2:1	2	0.167"	9/16"-18	3/8"	Acme Class 2C	Brinell 70	Not Rated	Not Rated	95072A771	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



		3/8"-12	5/8"	0.688"	Acme	2:1	2	0.167"	9/16"-18	3/8"	Acme Class 2C	Brinell 70	Not Rated	Not Rated	95072A772	000000

Flanges

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

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
1215 Carbon Steel



	9/16"-18	1 39/64"	13/32"	1 1/8"	Not Rated	95082A641	000000


	303 Stainless Steel



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



	3/8"-12	6	Rounded Acme	3:1	3	0.25"	±0.0006"/1"	Brinell 160	90,000	6350K113	0000000

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	3/8"-12	1"	0.625"	1 7/64"	3/16"	Rounded Acme	3:1	7/8"	3	0.25"	Not Rated	9,700	75	3	6350K151	000000


		Acetal with Wear-Compensating Spring



				C	3/8"-12	1 29/32"	0.703"	1 1/2"	3/16"	Rounded Acme	3:1	1 1/8"	3	0.25"	Not Rated	9,700	10	3	6350K188	00000

High-Capacity Press-Fit Leveling Mount Inserts

Rated for high load capacity, use these inserts to connect threaded leveling mounts to machinery, instrument bases, and conveyor equipment with tubular legs. These inserts have pass-through holes that are partially threaded at the base. Tap mounts into place with a rubber hammer.

For Square Legs


Shown with Brass Insert Installed

Plastic with Brass Insert—Move equipment around your workspace and make frequent adjustments without worrying about stripping the brass threads.

	For Leg						Thread
	Outer Lg.	Outer Wd.	Inner Lg.	Inner Wd.	Cap. per Mount, lb.	Overall Ht.	Size	Type	Dp.	Temp., ° F		Each
Plastic with Brass Insert



		1 1/2"	1 1/2"	1 1/4"	1 1/4"	1,500	1 3/4"	3/8"-12	Acme	1 1/4"	-20 to 180	60945K36	00000


		2"	2"	1 3/4"	1 3/4"	2,000	2"	3/8"-12	Acme	1"	-20 to 180	60945K38	0000

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.

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

	No. of Thread Starts	Hardness		Each
Right-Hand Thread







	Black-Oxide 12L14 Carbon Steel

	3/8"-12	1 1/8"	1/2"	1	Brinell 163	6698K11	000000




			303 Stainless Steel

			3/8"-12	7/8"	11/32"	1	Brinell 228	2228N22	00000