1 1/8"-5 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.

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



	1 1/8"-5	Acme	12"	1	1:1	0.2"	Acme Class 2G	SAE Grade 2	Rockwell B61	64,000	ASTM A108	98935A757	000000


	1 1/8"-5	Acme	3 ft.	1	1:1	0.2"	Acme Class 2G	SAE Grade 2	Rockwell B61	64,000	ASTM A108	98935A873	00000
	1 1/8"-5	Acme	6 ft.	1	1:1	0.2"	Acme Class 2G	SAE Grade 2	Rockwell B61	53,000	ASTM A108	98935A328	00000


	Alloy Steel



			1 1/8"-5	Acme	12"	1	1:1	0.2"	Acme Class 2G	ASTM Grade B7	Rockwell C35	125,000	ASTM A193	93410A975	00000


			1 1/8"-5	Acme	3 ft.	1	1:1	0.2"	Acme Class 2G	ASTM Grade B7	Rockwell C35	125,000	ASTM A193	93410A645	000000
			1 1/8"-5	Acme	6 ft.	1	1:1	0.2"	Acme Class 2G	ASTM Grade B7	Rockwell C35	125,000	ASTM A193	93410A210	000000


			18-8 Stainless Steel



					1 1/8"-5	Acme	3 ft.	1	1:1	0.2"	Acme Class 2G	—	Rockwell B96	Not Rated	—	95061A853	000000


					1 1/8"-5	Acme	6 ft.	1	1:1	0.2"	Acme Class 2G	—	Rockwell B96	Not Rated	—	95061A220	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



	1 1/8"-5	Acme	3	1	1:1	0.2"	Acme Class 2G	SAE Grade 2	Rockwell B61	53,000	ASTM A108	98935A509	000000


	1 1/8"-5	Acme	6	1	1:1	0.2"	Acme Class 2G	SAE Grade 2	Rockwell B61	53,000	ASTM A108	98935A510	00000


	Alloy Steel



			1 1/8"-5	Acme	3	1	1:1	0.2"	Acme Class 2G	ASTM Grade B7	Rockwell C35	125,000	ASTM A193	93410A504	000000


			1 1/8"-5	Acme	6	1	1:1	0.2"	Acme Class 2G	ASTM Grade B7	Rockwell C35	125,000	ASTM A193	93410A505	000000

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



	1 1/8"-5	Acme	3"	1 1/2"	1	1:1	0.2"	Acme Class 2G	Rockwell B75	Not Rated	93023A668	000000


	18-8 Stainless Steel



			1 1/8"-5	Acme	3"	1 1/2"	1	1:1	0.2"	Acme Class 2G	Not Rated	Not Rated	93030A122	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



	1 1/8"-5	Acme	3"	1 1/2"	1	1:1	0.2"	Acme Class 2G	Rockwell B75	Not Rated	93026A656	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



		1 1/8"-5	Acme	2 1/4"	1 3/4"	2 3/4"	5/8"	1	1:1	0.2"	Acme Class 2G	Not Rated	Not Rated	95120A167	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



		1 1/8"-5	Acme	2 1/4"	1 3/4"	2 3/4"	5/8"	1	1:1	0.2"	Acme Class 2G	Not Rated	Not Rated	95120A567	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



	1 1/8"-5	Acme	1 7/64"	1 13/16"	1	1:1	0.2"	Acme Class 2G	Rockwell B75	Not Rated	—	94815A119	000000


	Zinc-Plated Carbon Steel



			1 1/8"-5	Acme	1 7/64"	1 13/16"	1	1:1	0.2"	Acme Class 2G	Rockwell B75	Not Rated	—	98948A125	00000


			360 Brass



					1 1/8"-5	Acme	1 1/8"	1 3/4"	1	1:1	0.2"	Acme Class 2G	Rockwell B75	Not Rated	ASTM B16	95155A159	00000


					18-8 Stainless Steel



							1 1/8"-5	Acme	1 7/64"	1 3/4"	1	1:1	0.2"	Acme Class 2G	Not Rated	Not Rated	—	95066A220	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.

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



	1 1/8"-5	Acme	1 7/64"	1 13/16"	1	1:1	0.2"	Acme Class 2G	SAE Grade 2	Rockwell B85	64,000	—	91808A119	000000


	360 Brass



			1 1/8"-5	Acme	1 1/8"	1 3/4"	1	1:1	0.2"	Acme Class 2G	—	Rockwell B75	Not Rated	ASTM B16	95155A359	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



	1 1/8"-5	Acme	1 1/8"	1 3/4"	1	1:1	0.2"	Acme Class 2G	Rockwell B55	Not Rated	ASTM B16	95270A159	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

	1 1/8"-5	2 3/8"	3/4"	1	Brinell 163	6698K18	000000