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Bronze

673 Bronze

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	System of Measurement System of Measurement

Inch

	Thread Size Thread Size

	Length Length

	Thread Direction Thread Direction


Right Hand	Left Hand

	Thread Type Thread Type

Acme

	Tensile Strength Tensile Strength

Not Rated

	Thread Fit Thread Fit

Class 2C

	Hardness Hardness

Brinell 70

Not Rated

	Diameter Diameter

	Component Component

	Nut

	Nut Type Nut Type

	Externally Threaded

	Travel Distance per Turn Travel Distance per Turn

	Number of Thread Starts Number of Thread Starts

	Speed Ratio Speed Ratio

	Dynamic Thrust Load Capacity Dynamic Thrust Load Capacity

Not Rated

	External Thread Type External Thread Type

UNF

UNS

	External Thread Size External Thread Size

	External Thread Length External Thread Length

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72 Products

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.

932 bearing bronze and 673 bronze nuts are wear resistant. They have good machinability and fair 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

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.		Each
673 Bronze
1/4"-16	5/8"	0.688"	1	1:1	0.063"	9/16"-18	3/8"	Class 2C	Brinell 70	Not Rated	000000000	000000
3/8"-8	5/8"	0.688"	1	1:1	0.125"	9/16"-18	3/8"	Class 2C	Brinell 70	Not Rated	000000000	00000
3/8"-10	5/8"	0.688"	1	1:1	0.1"	9/16"-18	3/8"	Class 2C	Brinell 70	Not Rated	000000000	00000
3/8"-12	5/8"	0.688"	1	1:1	0.083"	9/16"-18	3/8"	Class 2C	Brinell 70	Not Rated	000000000	00000
3/8"-16	5/8"	0.688"	1	1:1	0.063"	9/16"-18	3/8"	Class 2C	Brinell 70	Not Rated	000000000	00000
1/2"-10	3/4"	1.125"	1	1:1	0.1"	15/16"-16	1/2"	Class 2C	Brinell 70	Not Rated	000000000	00000
5/8"-5	1"	1.125"	1	1:1	0.2"	15/16"-16	1/2"	Class 2C	Brinell 70	Not Rated	000000000	00000
5/8"-8	1"	1.125"	1	1:1	0.125"	15/16"-16	1/2"	Class 2C	Brinell 70	Not Rated	000000000	00000
5/8"-10	1"	1.125"	1	1:1	0.1"	15/16"-16	1/2"	Class 2C	Brinell 70	Not Rated	000000000	00000
3/4"-5	1 1/4"	1.125"	1	1:1	0.2"	1"-18	1/2"	Class 2C	Brinell 70	Not Rated	000000000	00000
3/4"-6	1 1/4"	1.125"	1	1:1	0.167"	1"-18	1/2"	Class 2C	Brinell 70	Not Rated	000000000	00000
3/4"-10	1 1/4"	1.125"	1	1:1	0.1"	1"-18	1/2"	Class 2C	Brinell 70	Not Rated	000000000	00000
7/8"-6	1 1/2"	1.5"	1	1:1	0.167"	1 3/8"-16	1/2"	Class 2C	Not Rated	Not Rated	000000000	00000
1"-4	1 1/2"	1.5"	1	1:1	0.25"	1 3/8"-16	1/2"	Class 2C	Brinell 70	Not Rated	000000000	00000
1"-5	1 1/2"	1.5"	1	1:1	0.2"	1 3/8"-16	1/2"	Class 2C	Brinell 70	Not Rated	000000000	00000
1"-6	1 1/2"	1.5"	1	1:1	0.167"	1 3/8"-16	1/2"	Class 2C	Brinell 70	Not Rated	000000000	00000
1"-10	1 1/2"	1.5"	1	1:1	0.1"	1 3/8"-16	1/2"	Class 2C	Brinell 70	Not Rated	000000000	00000
1 1/4"-4	1 3/4"	2.125"	1	1:1	0.25"	1 31/32"-18	13/16"	Class 2C	Brinell 70	Not Rated	000000000	00000
1 1/4"-5	1 3/4"	2.125"	1	1:1	0.2"	1 31/32"-18	13/16"	Class 2C	Brinell 70	Not Rated	000000000	00000
1 1/2"-4	2 19/64"	2.125"	1	1:1	0.25"	1 31/32"-18	13/16"	Class 2C	Brinell 70	Not Rated	000000000	000000
1 1/2"-5	2 19/64"	2.125"	1	1:1	0.2"	1 31/32"-18	13/16"	Class 2C	Brinell 70	Not Rated	000000000	000000
2"-4	2 3/4"	2.75"	1	1:1	0.25"	2 35/64"-18	7/8"	Class 2C	Brinell 70	Not Rated	000000000	000000
2"-5	2 3/4"	2.75"	1	1:1	0.2"	2 35/64"-18	7/8"	Class 2C	Brinell 70	Not Rated	000000000	000000
2 1/2"-4	3 3/8"	3.375"	1	1:1	0.25"	3 9/64"-12	1 9/16"	Class 2C	Brinell 70	Not Rated	000000000	000000

Externally Threaded Nuts—Left-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.		Each
673 Bronze
1/4"-16	5/8"	0.688"	1	1:1	0.063"	9/16"-18	3/8"	Class 2C	Brinell 70	Not Rated	000000000	000000
3/8"-12	5/8"	0.688"	1	1:1	0.083"	9/16"-18	3/8"	Class 2C	Brinell 70	Not Rated	000000000	00000
1/2"-10	3/4"	1.125"	1	1:1	0.1"	15/16"-16	1/2"	Class 2C	Brinell 70	Not Rated	000000000	00000
5/8"-5	1"	1.125"	1	1:1	0.2"	15/16"-16	1/2"	Class 2C	Brinell 70	Not Rated	000000000	00000
5/8"-8	1"	1.125"	1	1:1	0.125"	15/16"-16	1/2"	Class 2C	Brinell 70	Not Rated	000000000	00000
5/8"-10	1"	1.125"	1	1:1	0.1"	15/16"-16	1/2"	Class 2C	Brinell 70	Not Rated	000000000	00000
3/4"-5	1 1/4"	1.125"	1	1:1	0.2"	1"-18	1/2"	Class 2C	Brinell 70	Not Rated	000000000	00000
3/4"-6	1 1/4"	1.125"	1	1:1	0.167"	1"-18	1/2"	Class 2C	Brinell 70	Not Rated	000000000	00000
3/4"-10	1 1/4"	1.125"	1	1:1	0.1"	1"-18	1/2"	Class 2C	Brinell 70	Not Rated	000000000	00000
1"-4	1 1/2"	1.5"	1	1:1	0.25"	1 3/8"-16	1/2"	Class 2C	Brinell 70	Not Rated	000000000	00000
1"-5	1 1/2"	1.5"	1	1:1	0.2"	1 3/8"-16	1/2"	Class 2C	Brinell 70	Not Rated	000000000	00000
1"-6	1 1/2"	1.5"	1	1:1	0.167"	1 3/8"-16	1/2"	Class 2C	Brinell 70	Not Rated	000000000	00000
1"-10	1 1/2"	1.5"	1	1:1	0.1"	1 3/8"-16	1/2"	Class 2C	Brinell 70	Not Rated	000000000	00000
1 1/4"-4	1 3/4"	2.125"	1	1:1	0.25"	1 31/32"-18	13/16"	Class 2C	Brinell 70	Not Rated	000000000	00000
1 1/4"-5	1 3/4"	2.125"	1	1:1	0.2"	1 31/32"-18	13/16"	Class 2C	Brinell 70	Not Rated	000000000	00000
1 1/2"-4	2 19/64"	2.125"	1	1:1	0.25"	1 31/32"-18	13/16"	Class 2C	Brinell 70	Not Rated	000000000	000000
1 1/2"-5	2 19/64"	2.125"	1	1:1	0.2"	1 31/32"-18	13/16"	Class 2C	Brinell 70	Not Rated	000000000	000000
2"-4	2 3/4"	2.75"	1	1:1	0.25"	2 35/64"-18	7/8"	Class 2C	Brinell 70	Not Rated	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
3 9/64"-12	5 3/8"	1 37/64"	4 3/8"	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
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
1 31/32"-18	4 13/64"	53/64"	3 7/16"	Brinell 140	0000000	00000
2 35/64"-18	4 15/16"	29/32"	4 1/16"	Brinell 140	0000000	00000

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.

932 bearing bronze and 673 bronze nuts are wear resistant. They have good machinability and fair 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

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.		Each
673 Bronze
1/4"-12	5/8"	0.688"	4	4:1	0.333"	9/16"-18	3/8"	Class 2C	Brinell 70	Not Rated	000000000	000000
3/8"-8	5/8"	0.688"	2	2:1	0.25"	9/16"-18	3/8"	Class 2C	Brinell 70	Not Rated	000000000	00000
3/8"-8	5/8"	0.688"	4	4:1	0.5"	9/16"-18	3/8"	Class 2C	Brinell 70	Not Rated	000000000	00000
3/8"-10	5/8"	0.688"	2	2:1	0.2"	9/16"-18	3/8"	Class 2C	Brinell 70	Not Rated	000000000	00000
3/8"-12	5/8"	0.688"	2	2:1	0.167"	9/16"-18	3/8"	Class 2C	Brinell 70	Not Rated	000000000	00000
1/2"-8	3/4"	1.125"	2	2:1	0.25"	15/16"-16	1/2"	Class 2C	Brinell 70	Not Rated	000000000	00000
1/2"-8	3/4"	1.125"	8	8:1	1"	15/16"-16	1/2"	Class 2C	Brinell 70	Not Rated	000000000	00000
1/2"-10	3/4"	1.125"	2	2:1	0.2"	15/16"-16	1/2"	Class 2C	Brinell 70	Not Rated	000000000	00000
1/2"-10	3/4"	1.125"	5	5:1	0.5"	15/16"-16	1/2"	Class 2C	Brinell 70	Not Rated	000000000	00000
3/4"-6	1 1/4"	1.125"	2	2:1	0.333"	1"-18	1/2"	Class 2C	Brinell 70	Not Rated	000000000	00000
3/4"-8	1 1/4"	1.125"	4	4:1	0.5"	1"-18	1/2"	Class 2C	Brinell 70	Not Rated	000000000	00000
1"-10	1 1/2"	1.5"	10	10:1	1"	1 3/8"-16	1/2"	Class 2C	Brinell 70	Not Rated	000000000	00000
1 1/2"-4	2 19/64"	2.125"	2	2:1	0.5"	1 31/32"-18	13/16"	Class 2C	Brinell 70	Not Rated	000000000	000000

Externally Threaded Nuts—Left-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.		Each
673 Bronze
3/8"-12	5/8"	0.688"	2	2:1	0.167"	9/16"-18	3/8"	Class 2C	Brinell 70	Not Rated	000000000	000000
3/4"-6	1 1/4"	1.125"	2	2:1	0.333"	1"-18	1/2"	Class 2C	Brinell 70	Not Rated	000000000	00000
1"-10	1 1/2"	1.5"	10	10:1	1"	1 3/8"-16	1/2"	Class 2C	Brinell 70	Not Rated	000000000	00000
1 1/2"-4	2 19/64"	2.125"	2	2:1	0.5"	1 31/32"-18	13/16"	Class 2C	Brinell 70	Not Rated	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
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
1 31/32"-18	4 13/64"	53/64"	3 7/16"	Brinell 140	0000000	00000

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