Nonmetallic Precision Acme Nuts

	System of Measurement System of Measurement

Inch

Metric

	Thread Size Thread Size

	Thread Pitch Thread Pitch

0.3 mm

0.5 mm

1.5 mm

	Thread Type Thread Type

Acme

Rounded Acme

Metric Rounded
Trapezoidal

	Nut Type Nut Type

	Externally Threaded
	Round
	Flange

	Material Material

PET Plastic

Acetal Plastic

	Number of Thread Starts Number of Thread Starts

	Length Length

	Thread Direction Thread Direction


Right Hand	Left Hand

	Travel Distance per Turn Travel Distance per Turn

	Speed Ratio Speed Ratio

	Dynamic Thrust Load Capacity Dynamic Thrust Load Capacity

2,000 lbs. or greater

	Diameter Diameter

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	Minimum Temperature Minimum Temperature

-40° F

15° F

Not Rated

	Maximum Temperature Maximum Temperature

175° F

185° F

Not Rated

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

DFARS Specialty Metals
COTS-Exempt

	Tensile Strength Tensile Strength

8,000 psi

Not Rated

	External Thread Size External Thread Size

	External Thread Type External Thread Type

UNF

UNS

	External Thread Length External Thread Length

	Number of Mounting Holes Number of Mounting Holes

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Selecting Compatible 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.

PET plastic nuts are lightweight and corrosion resistant.

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

PET Plastic
Thread Size	Lg.	Dia.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness	Dynamic Thrust Load Cap., lbs.	Temperature Range, °F		Each
3/8"-8	3/4"	1.344"	1	1:1	0.125"	Class 2C	Not Rated	350	15° to 175°	00000000	000000
3/8"-10	3/4"	1.344"	1	1:1	0.1"	Class 2C	Not Rated	350	15° to 175°	00000000	00000
3/8"-12	3/4"	1.344"	1	1:1	0.083"	Class 2C	Not Rated	350	15° to 175°	00000000	00000
3/8"-16	3/4"	1.344"	1	1:1	0.063"	Class 2C	Not Rated	350	15° to 175°	0000000	00000
1/2"-10	1"	1.469"	1	1:1	0.1"	Class 2C	Not Rated	650	15° to 175°	00000000	00000
5/8"-5	1 1/4"	1.859"	1	1:1	0.2"	Class 2C	Not Rated	1,000	15° to 175°	0000000	00000
5/8"-8	1 1/4"	1.859"	1	1:1	0.125"	Class 2C	Not Rated	1,000	15° to 175°	00000000	00000
5/8"-10	1 1/4"	1.859"	1	1:1	0.1"	Class 2C	Not Rated	1,000	15° to 175°	00000000	00000
3/4"-5	1 1/2"	2.234"	1	1:1	0.2"	Class 2C	Not Rated	1,450	15° to 175°	00000000	000000
3/4"-6	1 1/2"	2.234"	1	1:1	0.167"	Class 2C	Not Rated	1,450	15° to 175°	00000000	000000
3/4"-10	1 1/2"	2.234"	1	1:1	0.1"	Class 2C	Not Rated	1,450	15° to 175°	00000000	000000

Round Nuts—Left-Hand Threaded

PET Plastic
Thread Size	Lg.	Dia.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness	Dynamic Thrust Load Cap., lbs.	Temperature Range, °F		Each
3/8"-8	3/4"	1.344"	1	1:1	0.125"	Class 2C	Not Rated	350	15° to 175°	00000000	000000
3/8"-10	3/4"	1.344"	1	1:1	0.1"	Class 2C	Not Rated	350	15° to 175°	00000000	00000
3/8"-12	3/4"	1.344"	1	1:1	0.083"	Class 2C	Not Rated	350	15° to 175°	00000000	00000
1/2"-10	1"	1.469"	1	1:1	0.1"	Class 2C	Not Rated	650	15° to 175°	00000000	00000
5/8"-8	1 1/4"	1.859"	1	1:1	0.125"	Class 2C	Not Rated	1,000	15° to 175°	00000000	00000
5/8"-10	1 1/4"	1.859"	1	1:1	0.1"	Class 2C	Not Rated	1,000	15° to 175°	00000000	00000
3/4"-5	1 1/2"	2.234"	1	1:1	0.2"	Class 2C	Not Rated	1,450	15° to 175°	00000000	000000
3/4"-6	1 1/2"	2.234"	1	1:1	0.167"	Class 2C	Not Rated	1,450	15° to 175°	00000000	000000
3/4"-10	1 1/2"	2.234"	1	1:1	0.1"	Class 2C	Not Rated	1,450	15° to 175°	00000000	000000

Externally Threaded Nuts—Right-Hand Threaded

Combine externally threaded nuts with a flange to create a custom flange nut.

						External Thread
Thread Size	Lg.	Dia.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Size	Lg.	Thread Fit	Hardness	Dynamic Thrust Load Cap., lbs.	Temperature Range, °F		Each
PET Plastic
1/4"-16	5/8"	0.688"	1	1:1	0.063"	9/16"-18	3/8"	Class 2C	Not Rated	160	15° to 175°	000000000	000000
1/4"-20	5/8"	0.688"	1	1:1	0.05"	9/16"-18	3/8"	Class 2C	Not Rated	160	15° to 175°	000000000	00000
3/8"-8	5/8"	0.688"	1	1:1	0.125"	9/16"-18	3/8"	Class 2C	Not Rated	350	15° to 175°	000000000	00000
3/8"-10	5/8"	0.688"	1	1:1	0.1"	9/16"-18	3/8"	Class 2C	Not Rated	350	15° to 175°	000000000	00000
3/8"-12	5/8"	0.688"	1	1:1	0.083"	9/16"-18	3/8"	Class 2C	Not Rated	350	15° to 175°	000000000	00000
3/8"-16	5/8"	0.688"	1	1:1	0.063"	9/16"-18	3/8"	Class 2C	Not Rated	350	15° to 175°	000000000	00000
1/2"-10	3/4"	1.125"	1	1:1	0.1"	15/16"-16	1/2"	Class 2C	Not Rated	650	15° to 175°	000000000	00000
5/8"-8	1"	1.125"	1	1:1	0.125"	15/16"-16	1/2"	Class 2C	Not Rated	1,000	15° to 175°	000000000	00000
5/8"-10	1"	1.125"	1	1:1	0.1"	15/16"-16	1/2"	Class 2C	Not Rated	1,000	15° to 175°	000000000	00000
3/4"-5	1 1/4"	1.125"	1	1:1	0.2"	1"-18	1/2"	Class 2C	Not Rated	1,450	15° to 175°	000000000	00000
3/4"-6	1 1/4"	1.125"	1	1:1	0.167"	1"-18	1/2"	Class 2C	Not Rated	1,450	15° to 175°	000000000	00000
3/4"-10	1 1/4"	1.125"	1	1:1	0.1"	1"-18	1/2"	Class 2C	Not Rated	1,450	15° to 175°	000000000	00000
1"-4	1 1/2"	1.5"	1	1:1	0.25"	1 3/8"-16	1/2"	Class 2C	Not Rated	2,500	15° to 175°	000000000	00000
1"-5	1 1/2"	1.5"	1	1:1	0.2"	1 3/8"-16	1/2"	Class 2C	Not Rated	2,500	15° to 175°	000000000	00000
1"-6	1 1/2"	1.5"	1	1:1	0.167"	1 3/8"-16	1/2"	Class 2C	Not Rated	2,500	15° to 175°	000000000	00000
1"-10	1 1/2"	1.5"	1	1:1	0.1"	1 3/8"-16	1/2"	Class 2C	Not Rated	2,500	15° to 175°	000000000	00000
1 1/4"-5	1 3/4"	2.125"	1	1:1	0.2"	1 31/32"-18	13/16"	Class 2C	Not Rated	3,900	15° to 175°	000000000	00000
1 1/2"-4	2 19/64"	2.125"	1	1:1	0.25"	1 31/32"-18	13/16"	Class 2C	Not Rated	6,000	15° to 175°	000000000	000000
2"-4	3 15/32"	2.75"	1	1:1	0.25"	2 35/64"-18	7/8"	Class 2C	Not Rated	10,000	15° to 175°	000000000	000000

Flanges

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

1117 Carbon Steel
Flange Thread Size	Flange Dia.	Flange Thick.	Bolt Circle Dia.	Flange Hardness		Each
1 3/8"-16	2 49/64"	33/64"	2 17/64"	Brinell 156	000000000	000000
1 31/32"-18	4 13/64"	53/64"	3 7/16"	Brinell 156	000000000	00000
2 35/64"-18	4 15/16"	29/32"	4 1/16"	Brinell 156	000000000	00000
1215 Carbon Steel
9/16"-18	1 39/64"	13/32"	1 1/8"	Not Rated	000000000	00000
15/16"-16	2 5/8"	17/32"	2 3/32"	Not Rated	000000000	00000
303 Stainless Steel
9/16"-18	1 39/64"	13/32"	1 1/8"	Brinell 140	0000000	00000
15/16"-16	2 5/8"	17/32"	2 3/32"	Brinell 140	0000000	00000
1 3/8"-16	2 49/64"	33/64"	2 17/64"	Brinell 140	0000000	00000
1 31/32"-18	4 13/64"	53/64"	3 7/16"	Brinell 140	0000000	000000
2 35/64"-18	4 15/16"	29/32"	4 1/16"	Brinell 140	0000000	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.

PET plastic nuts are lightweight and corrosion resistant.

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

PET Plastic
Thread Size	Lg.	Dia.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Thread Fit	Hardness	Dynamic Thrust Load Cap., lbs.	Temperature Range, °F		Each
1/4"-12	3/4"	1.344"	4	4:1	0.333"	Class 2C	Not Rated	160	15° to 175°	00000000	000000
3/8"-8	3/4"	1.344"	2	2:1	0.25"	Class 2C	Not Rated	350	15° to 175°	00000000	00000
3/8"-8	3/4"	1.344"	4	4:1	0.5"	Class 2C	Not Rated	350	15° to 175°	00000000	00000
3/8"-10	3/4"	1.344"	2	2:1	0.2"	Class 2C	Not Rated	350	15° to 175°	00000000	00000
1/2"-8	1"	1.469"	2	2:1	0.25"	Class 2C	Not Rated	650	15° to 175°	0000000	00000
1/2"-10	1"	1.469"	2	2:1	0.2"	Class 2C	Not Rated	650	15° to 175°	0000000	00000
1/2"-10	1"	1.469"	5	5:1	0.5"	Class 2C	Not Rated	650	15° to 175°	00000000	00000

Externally Threaded Nuts—Right-Hand Threaded

Combine externally threaded nuts with a flange to create a custom flange nut.

						External Thread
Thread Size	Lg.	Dia.	No. of Thread Starts	Speed Ratio	Travel Distance per Turn	Size	Lg.	Thread Fit	Hardness	Dynamic Thrust Load Cap., lbs.	Temperature Range, °F		Each
PET Plastic
1/4"-12	5/8"	0.688"	4	4:1	0.333"	9/16"-18	3/8"	Class 2C	Not Rated	160	15° to 175°	000000000	000000
3/8"-5	5/8"	0.688"	5	5:1	1"	9/16"-18	3/8"	Class 2C	Not Rated	250	15° to 175°	000000000	00000
3/8"-8	5/8"	0.688"	2	2:1	0.25"	9/16"-18	3/8"	Class 2C	Not Rated	350	15° to 175°	000000000	00000
3/8"-8	5/8"	0.688"	4	4:1	0.5"	9/16"-18	3/8"	Class 2C	Not Rated	350	15° to 175°	000000000	00000
3/8"-10	5/8"	0.688"	2	2:1	0.2"	9/16"-18	3/8"	Class 2C	Not Rated	350	15° to 175°	000000000	00000
1/2"-8	3/4"	1.125"	2	2:1	0.25"	15/16"-16	1/2"	Class 2C	Not Rated	650	15° to 175°	000000000	00000
1/2"-10	3/4"	1.125"	2	2:1	0.2"	15/16"-16	1/2"	Class 2C	Not Rated	650	15° to 175°	000000000	00000
1/2"-10	3/4"	1.125"	5	5:1	0.5"	15/16"-16	1/2"	Class 2C	Not Rated	650	15° to 175°	000000000	00000
3/4"-8	1 1/4"	1.125"	4	4:1	0.5"	1"-18	1/2"	Class 2C	Not Rated	1,450	15° to 175°	000000000	00000
1"-4	1 1/2"	1.5"	2	2:1	0.5"	1 3/8"-16	1/2"	Class 2C	Not Rated	2,500	15° to 175°	000000000	00000

Flanges

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

1117 Carbon Steel
Flange Thread Size	Flange Dia.	Flange Thick.	Bolt Circle Dia.	Flange Hardness		Each
1 3/8"-16	2 49/64"	33/64"	2 17/64"	Brinell 156	000000000	000000
1215 Carbon Steel
9/16"-18	1 39/64"	13/32"	1 1/8"	Not Rated	000000000	00000
15/16"-16	2 5/8"	17/32"	2 3/32"	Not Rated	000000000	00000
1"-18	2 5/8"	17/32"	2 3/32"	Not Rated	000000000	00000
303 Stainless Steel
9/16"-18	1 39/64"	13/32"	1 1/8"	Brinell 140	0000000	00000
15/16"-16	2 5/8"	17/32"	2 3/32"	Brinell 140	0000000	00000
1"-18	2 5/8"	17/32"	2 3/32"	Brinell 140	0000000	00000
1 3/8"-16	2 49/64"	33/64"	2 17/64"	Brinell 140	0000000	00000

Fast-Travel Ultra-Precision Lead Screws and Nuts

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.

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.

Flange Nuts—Right-Hand Threaded

Flange nuts with wear-compensating internal O-ring or wear-compensating spring maintain a tight fit even when their threads begin to wear.

				Flange
	Thread Size	Lg.	Dia.	Wd.	Ht.	Thick.	No. of Thread Starts	Thread Type	Speed Ratio	Travel Distance per Turn	Mounting Hole Ctr.-to-Ctr.	Tensile Strength, psi	Dynamic Thrust Load Cap., lbs.		Each
Acetal Plastic
A	9/64"-20.8	1/2"	0.406"	3/4"	13/32"	1/8"	2	Rounded Acme	2:1	0.096"	39/64"	Not Rated	25	0000000	000000
A	5/32"-21.3	1/2"	0.406"	3/4"	13/32"	1/8"	2	Rounded Acme	2:1	0.094"	39/64"	Not Rated	25	0000000	00000
A	3/16"-42.7	1/2"	0.406"	3/4"	13/32"	1/8"	16	Rounded Acme	16:1	0.375"	39/64"	Not Rated	25	0000000	00000
A	7/32"-20.8	1/2"	0.406"	3/4"	13/32"	1/8"	4	Rounded Acme	4:1	0.192"	39/64"	Not Rated	25	0000000	00000
Acetal Plastic with Wear-Compensating Internal O-Ring
A	9/64"-20.8	1/2"	0.406"	3/4"	13/32"	1/8"	2	Rounded Acme	2:1	0.096"	39/64"	Not Rated	5	0000000	00000
A	5/32"-21.3	1/2"	0.406"	3/4"	13/32"	1/8"	2	Rounded Acme	2:1	0.094"	39/64"	Not Rated	5	0000000	00000
A	3/16"-42.7	1/2"	0.406"	3/4"	13/32"	1/8"	16	Rounded Acme	16:1	0.375"	39/64"	Not Rated	5	0000000	00000
A	7/32"-20.8	1/2"	0.406"	3/4"	13/32"	1/8"	4	Rounded Acme	4:1	0.192"	39/64"	Not Rated	5	0000000	00000

Ultra-Precision Lead Screws and Nuts

Operating with less backlash (play) than Precision Acme Lead Screws and Nuts, these provide increased nut life and more reliable movement in automated systems. 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. All components are corrosion resistant for use in harsh environments. To ensure compatibility, select components that have the same thread type and thread size.

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.

Flange Nuts—Right-Hand Threaded

Flange nuts with wear-compensating internal O-ring or wear-compensating spring maintain a tight fit even when their threads begin to wear.

				Flange
	Thread Size	Lg.	Dia.	Wd.	Ht.	Thick.	No. of Thread Starts	Thread Type	Speed Ratio	Travel Distance per Turn	Mounting Hole Ctr.-to-Ctr.	Tensile Strength, psi	Dynamic Thrust Load Cap., lbs.		Each
Acetal Plastic
A	9/64"-20.8	1/2"	0.406"	3/4"	13/32"	1/8"	1	Rounded Acme	1:1	0.048"	39/64"	Not Rated	25	0000000	000000
A	9/64"-41.7	1/2"	0.406"	3/4"	13/32"	1/8"	1	Rounded Acme	1:1	0.024"	39/64"	Not Rated	25	0000000	00000
A	7/32"-20.8	1/2"	0.406"	3/4"	13/32"	1/8"	1	Rounded Acme	1:1	0.048"	39/64"	Not Rated	25	0000000	00000
Acetal Plastic with Wear-Compensating Internal O-Ring
A	9/64"-20.8	1/2"	0.406"	3/4"	13/32"	1/8"	1	Rounded Acme	1:1	0.048"	39/64"	Not Rated	5	0000000	00000
A	9/64"-41.7	1/2"	0.406"	3/4"	13/32"	1/8"	1	Rounded Acme	1:1	0.024"	39/64"	Not Rated	5	0000000	00000
A	7/32"-20.8	1/2"	0.406"	3/4"	13/32"	1/8"	1	Rounded Acme	1:1	0.048"	39/64"	Not Rated	5	0000000	00000

Metric Ultra-Precision Lead Screws and Nuts

Operating with less backlash (play) than Metric Precision Acme Lead Screws and Nuts, these provide increased nut life and more reliable movement in automated systems. 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, select components that have the same thread type and thread size.

Nuts are acetal plastic; they have good wear and corrosion resistance.

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.

Externally Threaded Nuts—Right-Hand Threaded

										External Thread
	Thread Size	Thread Pitch, mm	Lg.	Dia.	Hex Wd.	No. of Thread Starts	Thread Type	Speed Ratio	Travel Distance per Turn, mm	Size	Lg.	Tensile Strength, psi	Dynamic Thrust Load Cap., lbs.	Temperature Range, °F		Each
Acetal Plastic
A	M2	0.5	11/16"	0.297"	7/16"	1	Metric Rounded Trapezoidal	1:1	0.5	3/8"-24	3/16"	8,000	10	-40° to 185°	0000000	000000
A	M4	0.3	11/16"	0.297"	7/16"	1	Metric Rounded Trapezoidal	1:1	0.3	3/8"-24	3/16"	8,000	25	-40° to 185°	0000000	00000
A	M8	1.5	1"	0.548"	11/16"	1	Metric Rounded Trapezoidal	1:1	1.5	5/8"-18	1/4"	8,000	75	-40° to 185°	0000000	00000

Flange Nuts—Right-Hand Threaded

					Flange
	Thread Size	Thread Pitch, mm	Lg.	Dia.	Dia.	Wd.	Ht.	Thick.	No. of Thread Starts	Thread Type	Speed Ratio	Travel Distance per Turn, mm	Mounting Hole Ctr.-to-Ctr.	Bolt Circle Dia.	Tensile Strength, psi	Dynamic Thrust Load Cap., lbs.	Temperature Range, °F		Each
Acetal Plastic
B	M2	0.5	1/2"	0.297"	__	3/4"	13/32"	1/8"	1	Metric Rounded Trapezoidal	1:1	0.5	39/64"	__	8,000	10	-40° to 185°	0000000	000000
B	M4	0.3	1/2"	0.297"	__	3/4"	13/32"	1/8"	1	Metric Rounded Trapezoidal	1:1	0.3	39/64"	__	8,000	25	-40° to 185°	0000000	00000
C	M8	1.5	3/4"	0.548"	1 1/8"	__	__	3/16"	1	Metric Rounded Trapezoidal	1:1	1.5	__	7/8"	8,000	75	-40° to 185°	0000000	00000