Iron Butterfly Nuts | McMaster-Carr

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	Material Material	Show

Iron

	Material Material	Hide

	System of Measurement System of Measurement

Inch

Metric

	Thread Size Thread Size

	Thread Type Thread Type

UNC

Metric

Acme

	Component Component


Handle	Nut

	Base Diameter Base Diameter

	Width Width

	Nut Type Nut Type

	Thumb

	Wing Nut Profile Wing Nut Profile

	Standard

	Handle Style Handle Style


Flat	Ball

Offset

	Thumb Nut Head Shape Thumb Nut Head Shape

	Wing

	Height Height

	Thread Fit Thread Fit

Class 2B

Class 6H

Class 2G

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Thread Pitch Thread Pitch

	Thread Spacing Thread Spacing

Coarse

	Travel Distance per Turn Travel Distance per Turn

	Hardness Hardness

Rockwell B67

Rockwell B72

Rockwell B97

	Finish Finish

Zinc Plated

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78 Products

About Nuts, Materials, and Finishes

Selecting Compatible Lead Screws and Nuts

Wings provide more leverage for greater torque while tightening than knurled-head thumb nuts.

Zinc-plated wing nuts are corrosion resistant in wet environment.

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

Zinc-Plated Iron
	Thread Size	Base Dia.	Wd.	Ht.	Pkg. Qty.		Pkg.
2	3/8"-16	5/8"	1 5/8"	7/8"	5	000000000	000000
Iron
2	10-24	3/8"	1 1/8"	1/2"	5	000000000	00000
2	3/8"-16	5/8"	1 5/8"	7/8"	5	000000000	00000
2	3/4"-10	1 1/4"	3"	1 1/4"	1	000000000	0000
4	5/16"-18	5/8"	1 1/2"	3/4"	5	000000000	00000
5	8-32	1/4"	1"	1/2"	1	000000000	0000
5	1/4"-20	7/16"	1 1/8"	5/8"	5	000000000	00000
7	1/4"-20	1"	3"	3/4"	1	000000000	0000
7	5/16"-18	1"	3"	3/4"	1	000000000	0000

Metric Steel and Iron Wing Nuts

These nuts have wings that provide more leverage for greater torque while tightening than knurled-head thumb nuts.

Zinc-plated wing nuts are corrosion resistant in wet environments.

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

Thread
Size	Pitch, mm	Base Dia., mm	Wd., mm	Ht., mm	Pkg. Qty.		Pkg.
Style 2
Zinc-Plated Iron
M5	0.8	9.53	28.6	12.7	5	000000000	000000
M10	1.5	16	41.3	20.6	1	000000000	0000
M14	2	21	57.2	25.4	1	000000000	0000
Style 5
Iron
M14	2	30.16	76.2	31.8	1	000000000	0000
M16	2	30.16	76.2	31.8	1	000000000	0000
M18	2.5	30.16	76.2	31.8	1	000000000	0000
M20	2.5	30.16	76.2	31.8	1	000000000	0000
M22	2.5	30.16	76.2	31.8	1	000000000	00000
Zinc-Plated Iron
M14	2	30.16	76.2	31.8	1	000000000	0000
M16	2	30.16	76.2	31.8	1	000000000	0000
M18	2.5	30.16	76.2	31.8	1	000000000	00000
M20	2.5	30.16	76.2	31.8	1	000000000	00000
M22	2.5	30.16	76.2	31.8	1	000000000	00000
Style 6
Iron
M14	2	28.6	114.3	47.6	1	000000000	0000
M14	2	35.72	155.6	63.5	1	000000000	00000
M16	2	28.6	114.3	47.6	1	000000000	00000
M16	2	35.72	155.6	63.5	1	000000000	00000
M16	2	44.45	203.2	79.4	1	000000000	00000
M18	2.5	28.6	114.3	47.6	1	000000000	00000
M18	2.5	35.72	155.6	63.5	1	000000000	00000
M18	2.5	44.45	203.2	79.4	1	000000000	00000
M20	2.5	28.6	114.3	47.6	1	000000000	00000
M20	2.5	35.72	155.6	63.5	1	000000000	00000
M20	2.5	44.45	203.2	79.4	1	000000000	00000
M22	2.5	28.6	114.3	47.6	1	000000000	00000
M22	2.5	35.72	155.6	63.5	1	000000000	00000
M22	2.5	44.45	203.2	79.4	1	000000000	00000
M24	3	44.45	203.2	79.4	1	000000000	00000
M27	3	44.45	203.2	79.4	1	000000000	00000
Zinc-Plated Iron
M14	2	28.6	114.3	47.6	1	000000000	0000
M14	2	35.72	155.6	63.5	1	000000000	00000
M16	2	28.6	114.3	47.6	1	000000000	00000
M16	2	35.72	155.6	63.5	1	000000000	00000
M16	2	44.45	203.2	79.4	1	000000000	00000
M18	2.5	28.6	114.3	47.6	1	000000000	00000
M18	2.5	35.72	155.6	63.5	1	000000000	00000
M18	2.5	44.45	203.2	79.4	1	000000000	00000
M20	2.5	28.6	114.3	47.6	1	000000000	00000
M20	2.5	35.72	155.6	63.5	1	000000000	00000
M20	2.5	44.45	203.2	79.4	1	000000000	00000
M22	2.5	28.6	114.3	47.6	1	000000000	00000
M22	2.5	35.72	155.6	63.5	1	000000000	00000
M22	2.5	44.45	203.2	79.4	1	000000000	00000
M24	3	44.45	203.2	79.4	1	000000000	00000
M27	3	44.45	203.2	79.4	1	000000000	00000

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 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.

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