McMaster-Carr

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	System of Measurement System of Measurement

Inch

	Thread Size Thread Size

	Thread Type Thread Type

Acme

Coil

NPT

	Material Material	Show

Iron

	Material Material	Hide

	Component Component

	Nut
	Handle
	Wing Nut
	Flange Nut

	Nut Type Nut Type

Flange

Round

Thumb

	Thread Direction Thread Direction


Right Hand	Left Hand

	Handle Style Handle Style


Ball	Flat

Offset

	Width Width

	Height Height

	Travel Distance per Turn Travel Distance per Turn

	Hardness Hardness

	Tensile Strength Tensile Strength

Not Rated

	Speed Ratio Speed Ratio

	Thread Fit Thread Fit

Class 2C

Class 2G

	Number of Thread Starts Number of Thread Starts

	Fabrication Fabrication

Cast

	Diameter Diameter

	Length Length

	Base Diameter Base Diameter

1 1/4"

1 3/4"

1 7/8"

	Dynamic Thrust Load Capacity Dynamic Thrust Load Capacity

Not Rated

	Drive Style Drive Style

	External Hex

	Flange Thickness Flange Thickness

9/32"

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109 Products

Selecting Compatible Lead Screws and Nuts

How to Identify and Measure Fittings

Pipe size is an industry designation, not the actual size. View information about how to measure threaded and unthreaded pipe and pipe fittings.

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 and size.

Cast iron components have good machinability and high strength.

Travel distance per turn, also known as screw lead, is the distance a nut or handle moves with one revolution of the lead screw.

For technical drawings and 3-D models, click on a part number.

Round Nuts—Right-Hand Threaded

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

Cast Iron
Thread Size	Ht.	Dia.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness		Each
1/2"-10	1"	1 15/32"	1	1:1	0.1"	Class 2G	Rockwell B96	000000000	000000
5/8"-8	1 1/4"	1 55/64"	1	1:1	0.125"	Class 2G	Rockwell B96	000000000	00000
3/4"-5	1 1/2"	2 15/64"	1	1:1	0.2"	Class 2G	Rockwell B96	000000000	00000
3/4"-6	1 1/2"	2 15/64"	1	1:1	0.167"	Class 2G	Rockwell B96	000000000	00000
1"-5	2"	2 63/64"	1	1:1	0.2"	Class 2G	Rockwell B96	000000000	00000
1"-6	2"	2 63/64"	1	1:1	0.167"	Class 2G	Rockwell B96	000000000	00000
1"-10	2"	2 63/64"	1	1:1	0.1"	Class 2G	Rockwell B96	000000000	00000
1 1/4"-5	2 1/2"	3 47/64"	1	1:1	0.2"	Class 2G	Rockwell B96	000000000	000000
1 1/2"-4	3"	4 15/32"	1	1:1	0.25"	Class 2G	Rockwell B96	000000000	000000

Round Nuts—Left-Hand Threaded

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

Cast Iron
Thread Size	Ht.	Dia.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness		Each
1/2"-10	1"	1 15/32"	1	1:1	0.1"	Class 2G	Rockwell B96	000000000	000000
5/8"-8	1 1/4"	1 55/64"	1	1:1	0.125"	Class 2G	Rockwell B96	000000000	00000
3/4"-5	1 1/2"	2 15/64"	1	1:1	0.2"	Class 2G	Rockwell B96	000000000	00000
3/4"-6	1 1/2"	2 15/64"	1	1:1	0.167"	Class 2G	Rockwell B96	000000000	00000
1"-5	2"	2 63/64"	1	1:1	0.2"	Class 2G	Rockwell B96	000000000	00000

Thumb Nuts—Right-Handed Threaded

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

Cast Iron
Thread Size	Ht.	Wd.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness		Each
1/2"-10	1 3/16"	2 3/4"	1	1:1	0.1"	Class 2G	Rockwell B97	000000000	00000
5/8"-8	1 3/16"	2 3/4"	1	1:1	0.125"	Class 2G	Rockwell B97	000000000	0000

Flat Handles—Right-Hand Threaded

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

Cast Iron
Thread Size	Ht.	Wd.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness		Each
3/8"-12	1 1/8"	9 1/2"	1	1:1	0.083"	Class 2G	Rockwell B72	000000000	000000
1/2"-10	1 1/8"	9 1/2"	1	1:1	0.1"	Class 2G	Rockwell B72	000000000	00000
5/8"-8	1 1/8"	9 1/2"	1	1:1	0.125"	Class 2G	Rockwell B72	000000000	00000
3/4"-5	1 1/8"	9 1/2"	1	1:1	0.2"	Class 2G	Rockwell B72	000000000	00000
3/4"-6	1 1/8"	9 1/2"	1	1:1	0.167"	Class 2G	Rockwell B72	000000000	00000
7/8"-6	1 1/8"	9 1/2"	1	1:1	0.167"	Class 2G	Rockwell B72	000000000	00000
1"-4	1 1/8"	9 1/2"	1	1:1	0.25"	Class 2G	Rockwell B72	000000000	00000
1"-5	1 1/8"	9 1/2"	1	1:1	0.2"	Class 2G	Rockwell B72	000000000	00000
1"-6	1 1/8"	9 1/2"	1	1:1	0.167"	Class 2G	Rockwell B72	000000000	00000
1 1/4"-4	1 1/8"	9 1/2"	1	1:1	0.25"	Class 2G	Rockwell B72	000000000	00000
1 1/4"-5	1 1/8"	9 1/2"	1	1:1	0.2"	Class 2G	Rockwell B72	000000000	00000
1 1/2"-4	1 1/8"	9 1/2"	1	1:1	0.25"	Class 2G	Rockwell B72	000000000	00000

Ball Handles—Right-Hand Threaded

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

Cast Iron
Thread Size	Ht.	Wd.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness		Each
3/4"-5	1 1/8"	9 1/2"	1	1:1	0.2"	Class 2G	Rockwell B72	000000000	000000
3/4"-6	1 1/8"	9 1/2"	1	1:1	0.167"	Class 2G	Rockwell B72	000000000	00000
1"-5	1 1/8"	9 1/2"	1	1:1	0.2"	Class 2G	Rockwell B72	000000000	00000
1"-6	1 1/8"	9 1/2"	1	1:1	0.167"	Class 2G	Rockwell B72	000000000	00000
1 1/4"-4	1 1/8"	9 1/2"	1	1:1	0.25"	Class 2G	Rockwell B72	000000000	00000
1 1/4"-5	1 1/8"	9 1/2"	1	1:1	0.2"	Class 2G	Rockwell B72	000000000	00000
1 1/2"-4	1 1/8"	9 1/2"	1	1:1	0.25"	Class 2G	Rockwell B72	000000000	00000

Offset Handles—Right-Hand Threaded

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

Cast Iron
Thread Size	Ht.	Wd.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness		Each
3/8"-12	1 3/4"	4 1/4"	1	1:1	0.083"	Class 2G	Rockwell B67	000000000	000000
1/2"-10	2"	4 1/2"	1	1:1	0.1"	Class 2G	Rockwell B67	000000000	00000
5/8"-8	2 1/4"	4 3/4"	1	1:1	0.125"	Class 2G	Rockwell B67	000000000	00000

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 and size.

Cast iron nuts have good machinability and high strength.

Travel distance per turn, also known as screw lead, is the distance a nut moves with one revolution of the lead screw.

For technical drawings and 3-D models, click on a part number.

Round Nuts—Right-Hand Threaded

Cast Iron
Thread Size	Lg.	Dia.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness	Dynamic Thrust Load Cap., lbs.		Each
3/8"-8	3/4"	1.344"	1	1:1	0.125"	Class 2C	Brinell 217	Not Rated	000000000	000000
3/8"-10	3/4"	1.344"	1	1:1	0.1"	Class 2C	Brinell 217	Not Rated	000000000	00000
3/8"-12	3/4"	1.344"	1	1:1	0.083"	Class 2C	Brinell 217	Not Rated	000000000	00000
3/8"-16	3/4"	1.344"	1	1:1	0.063"	Class 2C	Brinell 217	Not Rated	000000000	00000
1/2"-10	1"	1.469"	1	1:1	0.1"	Class 2C	Brinell 217	Not Rated	000000000	00000
5/8"-5	1 1/4"	1.859"	1	1:1	0.2"	Class 2C	Brinell 217	Not Rated	000000000	00000
5/8"-8	1 1/4"	1.859"	1	1:1	0.125"	Class 2C	Brinell 217	Not Rated	000000000	00000
5/8"-10	1 1/4"	1.859"	1	1:1	0.1"	Class 2C	Brinell 217	Not Rated	000000000	00000
3/4"-5	1 1/2"	2.234"	1	1:1	0.2"	Class 2C	Brinell 217	Not Rated	000000000	00000
3/4"-6	1 1/2"	2.234"	1	1:1	0.167"	Class 2C	Brinell 217	Not Rated	000000000	00000
3/4"-10	1 1/2"	2.234"	1	1:1	0.1"	Class 2C	Brinell 217	Not Rated	000000000	00000
7/8"-6	2"	2.985"	1	1:1	0.167"	Class 2C	Not Rated	Not Rated	000000000	00000
1"-4	2"	2.984"	1	1:1	0.25"	Class 2C	Brinell 217	Not Rated	000000000	00000
1"-5	2"	2.984"	1	1:1	0.2"	Class 2C	Brinell 217	Not Rated	000000000	00000
1"-6	2"	2.984"	1	1:1	0.167"	Class 2C	Brinell 217	Not Rated	000000000	00000
1"-10	2"	2.984"	1	1:1	0.1"	Class 2C	Brinell 217	Not Rated	000000000	00000
1 1/4"-4	2 1/2"	3.734"	1	1:1	0.25"	Class 2C	Brinell 217	Not Rated	000000000	000000
1 1/4"-5	2 1/2"	3.734"	1	1:1	0.2"	Class 2C	Brinell 217	Not Rated	000000000	000000
1 1/2"-4	3"	4.469"	1	1:1	0.25"	Class 2C	Brinell 217	Not Rated	000000000	000000

Round Nuts—Left-Hand Threaded

Cast Iron
Thread Size	Lg.	Dia.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness	Dynamic Thrust Load Cap., lbs.		Each
3/8"-8	3/4"	1.344"	1	1:1	0.125"	Class 2C	Brinell 217	Not Rated	000000000	000000
3/8"-10	3/4"	1.344"	1	1:1	0.1"	Class 2C	Brinell 217	Not Rated	000000000	00000
3/8"-12	3/4"	1.344"	1	1:1	0.083"	Class 2C	Brinell 217	Not Rated	000000000	00000
3/8"-16	3/4"	1.344"	1	1:1	0.063"	Class 2C	Brinell 217	Not Rated	000000000	00000
1/2"-10	1"	1.469"	1	1:1	0.1"	Class 2C	Brinell 217	Not Rated	000000000	00000
5/8"-5	1 1/4"	1.859"	1	1:1	0.2"	Class 2C	Brinell 217	Not Rated	000000000	00000
5/8"-8	1 1/4"	1.859"	1	1:1	0.125"	Class 2C	Brinell 217	Not Rated	000000000	00000
5/8"-10	1 1/4"	1.859"	1	1:1	0.1"	Class 2C	Brinell 217	Not Rated	000000000	00000
3/4"-5	1 1/2"	2.234"	1	1:1	0.2"	Class 2C	Brinell 217	Not Rated	000000000	00000
3/4"-6	1 1/2"	2.234"	1	1:1	0.167"	Class 2C	Brinell 217	Not Rated	000000000	00000
3/4"-10	1 1/2"	2.234"	1	1:1	0.1"	Class 2C	Brinell 217	Not Rated	000000000	00000
1"-4	2"	2.984"	1	1:1	0.25"	Class 2C	Brinell 217	Not Rated	000000000	00000
1"-5	2"	2.984"	1	1:1	0.2"	Class 2C	Brinell 217	Not Rated	000000000	00000
1"-6	2"	2.984"	1	1:1	0.167"	Class 2C	Brinell 217	Not Rated	000000000	00000
1"-10	2"	2.984"	1	1:1	0.1"	Class 2C	Brinell 217	Not Rated	000000000	00000
1 1/4"-4	2 1/2"	3.734"	1	1:1	0.25"	Class 2C	Brinell 217	Not Rated	000000000	000000
1 1/4"-5	2 1/2"	3.734"	1	1:1	0.2"	Class 2C	Brinell 217	Not Rated	000000000	000000
1 1/2"-4	3"	4.469"	1	1:1	0.25"	Class 2C	Brinell 217	Not Rated	000000000	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.

Cast iron nuts have good machinability and high strength.

Travel distance per turn, also known as screw lead, is the distance a nut moves with one revolution of the lead screw.

For technical drawings and 3-D models, click on a part number.

Round Nuts—Right-Hand Threaded

Cast Iron
Thread Size	Lg.	Dia.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness	Dynamic Thrust Load Cap., lbs.		Each
1/4"-12	3/4"	1.344"	4	4:1	0.333"	Class 2C	Brinell 217	Not Rated	000000000	000000
3/8"-8	3/4"	1.344"	2	2:1	0.25"	Class 2C	Brinell 217	Not Rated	000000000	00000
3/8"-8	3/4"	1.344"	4	4:1	0.5"	Class 2C	Brinell 217	Not Rated	000000000	00000
3/8"-10	3/4"	1.344"	2	2:1	0.2"	Class 2C	Brinell 217	Not Rated	000000000	00000
1/2"-8	1"	1.469"	2	2:1	0.25"	Class 2C	Brinell 217	Not Rated	000000000	00000
1/2"-10	1"	1.469"	2	2:1	0.2"	Class 2C	Brinell 217	Not Rated	000000000	00000
1/2"-10	1"	1.469"	5	5:1	0.5"	Class 2C	Brinell 217	Not Rated	000000000	00000

Quick-Clamping Coil-Threaded Rods, Screws, and Nuts

Combine fast-threading components to build a clamping assembly. The coil-style threads are shallow and widely spaced for quick threading.

Flange nuts have a large bearing surface to cover holes and resist vibration.

Wing nuts can be fastened by hand.

Flange Nuts

Flange Nut

Thread				Flange				Mounting Holes
Size	Direction	Wd.	Ht.	Dia.	Thick.	Material	Tensile Strength	Number of	Dia.	Ctr.-to-Ctr.	Mounting Fasteners Included		Each
1/2"-6	Right Hand	1 3/16"	1 5/8"	4"	9/32"	Iron	Not Rated	4	5/16"	2 1/16"	No	000000000	000000
3/4"-4 1/2	Right Hand	1 3/16"	1 5/8"	4"	9/32"	Iron	Not Rated	4	5/16"	2 1/16"	No	000000000	00000

Wing Nuts

Wing Nut

Thread
Size	Direction	Wd.	Ht.	Base Dia.	Material	Tensile Strength		Each
1/2"-6	Right Hand	5"	2 3/8"	1 1/4"	Iron	Not Rated	000000000	000000
3/4"-4 1/2	Right Hand	6"	2 1/2"	1 3/4"	Iron	Not Rated	000000000	00000
1"-3 1/2	Right Hand	6"	3"	1 7/8"	Iron	Not Rated	000000000	00000

Thick-Wall Galvanized Iron and Steel
Threaded Pipe Nipples and Pipe

Made of galvanized iron or steel, this pipe has fair corrosion resistance. It has thick, Schedule 80 walls for good strength in medium-pressure applications.

Seamless pipe has a smooth interior for unrestricted flow and is stronger than welded pipe.

Straight reducers are also known as swage nipples.

For technical drawings and 3-D models, click on a part number.

Reducers, Threaded on Both Ends

For Use With: Air, Natural Gas, Nitrogen Gas, Oil, Steam, Water
Specifications Met: MSS SP-95, ASTM A234, ANSI/ASME B1.20.1
Fittings: Use Class 300 iron or steel
Flanges: Use Class 300 steel

Pipe Size
(A)	(B)	Lg.	Thread Type	Construction	Material		Each
3/4	1/8	3"	NPT	Seamless	Galvanized Iron	00000000	000000
2	1/4	6 1/2"	NPT	Seamless	Galvanized Iron	00000000	00000
2 1/2	3/4	7"	NPT	Seamless	Galvanized Iron	00000000	000000
2 1/2	1	7"	NPT	Seamless	Galvanized Iron	00000000	00000
2 1/2	1 1/4	7"	NPT	Seamless	Galvanized Iron	00000000	00000
2 1/2	1 1/2	7"	NPT	Seamless	Galvanized Iron	00000000	00000
2 1/2	2	7"	NPT	Seamless	Galvanized Iron	00000000	00000
3	1/2	8"	NPT	Seamless	Galvanized Iron	00000000	000000
3	3/4	8"	NPT	Seamless	Galvanized Iron	00000000	000000
3	1	8"	NPT	Seamless	Galvanized Iron	00000000	000000
3	1 1/4	8"	NPT	Seamless	Galvanized Iron	00000000	000000
3	1 1/2	8"	NPT	Seamless	Galvanized Iron	00000000	000000
3	2	8"	NPT	Seamless	Galvanized Iron	00000000	00000
3	2 1/2	8"	NPT	Seamless	Galvanized Iron	00000000	00000
4	1/2	9"	NPT	Seamless	Galvanized Iron	00000000	000000
4	3/4	9"	NPT	Seamless	Galvanized Iron	00000000	000000
4	1	9"	NPT	Seamless	Galvanized Iron	00000000	000000
4	1 1/4	9"	NPT	Seamless	Galvanized Iron	00000000	000000
4	1 1/2	9"	NPT	Seamless	Galvanized Iron	00000000	000000
4	2	9"	NPT	Seamless	Galvanized Iron	00000000	000000
4	2 1/2	9"	NPT	Seamless	Galvanized Iron	00000000	000000
4	3	9"	NPT	Seamless	Galvanized Iron	00000000	000000

Terms and Conditions and Privacy Policy

Selecting Compatible Lead Screws and Nuts

How to Identify and Measure Fittings

Acme Lead Screws and Nuts

Precision Acme Lead Screws and Nuts

Fast-Travel Precision Acme Lead Screws and Nuts

Quick-Clamping Coil-Threaded Rods, Screws, and Nuts

Thick-Wall Galvanized Iron and SteelThreaded Pipe Nipples and Pipe

Thick-Wall Galvanized Iron and Steel
Threaded Pipe Nipples and Pipe