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.

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

Lead Screws—Right-Hand Threaded

Thread Size Lg. No. of

Thread Starts Thread Type Speed

Ratio Travel Distance

per Turn Accuracy for Travel

Distance per Turn Hardness Tensile

Strength, psi Each

303 Stainless Steel

9/64"-20.8 18" 2 Rounded Acme 2:1 0.096" ±0.0006" per in. Brinell 160 90,000 6642K13 $58.78

5/32"-21.3 18" 2 Rounded Acme 2:1 0.094" ±0.0006" per in. Brinell 160 90,000 6642K15 58.78

3/16"-42.7 18" 16 Rounded Acme 16:1 0.375" ±0.0006" per in. Brinell 160 90,000 6642K47 58.78

7/32"-20.8 9" 4 Rounded Acme 4:1 0.192" ±0.0006" per in. Brinell 160 90,000 6350K693 32.34

7/32"-20.8 18" 4 Rounded Acme 4:1 0.192" ±0.0006" per in. Brinell 160 90,000 6642K16 58.78

1/4"-8 3ft. 8 Rounded Acme 8:1 1" ±0.0006" per in. Brinell 160 90,000 6350K701 152.06

1/4"-8 6ft. 8 Rounded Acme 8:1 1" ±0.0006" per in. Brinell 160 90,000 6350K12 176.00

1/4"-16 3ft. 4 Rounded Acme 4:1 0.25" ±0.0006" per in. Brinell 160 90,000 6350K699 152.06

1/4"-16 6ft. 4 Rounded Acme 4:1 0.25" ±0.0006" per in. Brinell 160 90,000 6350K11 176.00

1/4"-20 3ft. 2 Rounded Acme 2:1 0.1" ±0.0006" per in. Brinell 160 90,000 6350K698 50.68

1/4"-20 6ft. 2 Rounded Acme 2:1 0.1" ±0.0006" per in. Brinell 160 90,000 6350K128 176.00

3/8"-5 3ft. 5 Rounded Acme 5:1 1" ±0.0006" per in. Brinell 160 90,000 6350K709 157.70

3/8"-5 6ft. 5 Rounded Acme 5:1 1" ±0.0006" per in. Brinell 160 90,000 6350K16 186.56

3/8"-8 3ft. 2 Rounded Acme 2:1 0.25" ±0.0006" per in. Brinell 160 90,000 6350K707 157.70

3/8"-8 3ft. 4 Rounded Acme 4:1 0.5" ±0.0006" per in. Brinell 160 90,000 6350K708 157.70

3/8"-8 6ft. 4 Rounded Acme 4:1 0.5" ±0.0006" per in. Brinell 160 90,000 6350K15 186.56

3/8"-10 3ft. 2 Rounded Acme 2:1 0.2" ±0.0006" per in. Brinell 160 90,000 6350K706 157.70

3/8"-10 6ft. 2 Rounded Acme 2:1 0.2" ±0.0006" per in. Brinell 160 90,000 6350K14 186.56

3/8"-12 6ft. 3 Rounded Acme 3:1 0.25" ±0.0006" per in. Brinell 160 90,000 6350K113 186.56

1/2"-8 3ft. 2 Rounded Acme 2:1 0.25" ±0.0006" per in. Brinell 160 90,000 6350K715 203.44

1/2"-8 3ft. 4 Rounded Acme 4:1 0.5" ±0.0006" per in. Brinell 160 90,000 6350K716 203.44

1/2"-8 3ft. 8 Rounded Acme 8:1 1" ±0.0006" per in. Brinell 160 90,000 6350K717 203.44

1/2"-8 6ft. 2 Rounded Acme 2:1 0.25" ±0.0006" per in. Brinell 160 90,000 6350K115 247.56

1/2"-8 6ft. 4 Rounded Acme 4:1 0.5" ±0.0006" per in. Brinell 160 90,000 6350K23 247.56

1/2"-8 6ft. 8 Rounded Acme 8:1 1" ±0.0006" per in. Brinell 160 90,000 6350K24 247.56

1/2"-10 3ft. 2 Rounded Acme 2:1 0.2" ±0.0006" per in. Brinell 160 90,000 6350K714 203.44

1/2"-10 6ft. 2 Rounded Acme 2:1 0.2" ±0.0006" per in. Brinell 160 90,000 6350K22 247.56

5/8"-6 3ft. 12 Rounded Acme 12:1 2" ±0.0006" per in. Brinell 160 90,000 6350K721 237.94

5/8"-6 6ft. 12 Rounded Acme 12:1 2" ±0.0006" per in. Brinell 160 90,000 6350K102 298.03

5/8"-8 3ft. 4 Rounded Acme 4:1 0.5" ±0.0006" per in. Brinell 160 90,000 6350K719 237.94

5/8"-8 6ft. 4 Rounded Acme 4:1 0.5" ±0.0006" per in. Brinell 160 90,000 6350K107 298.03

3/4"-8 3ft. 2 Rounded Acme 2:1 0.25" ±0.0006" per in. Brinell 160 90,000 6350K723 316.09

3/4"-8 3ft. 8 Rounded Acme 8:1 1" ±0.0006" per in. Brinell 160 90,000 6350K724 316.09

3/4"-8 6ft. 2 Rounded Acme 2:1 0.25" ±0.0006" per in. Brinell 160 90,000 6350K25 359.47

3/4"-8 6ft. 8 Rounded Acme 8:1 1" ±0.0006" per in. Brinell 160 90,000 6350K725 359.46

Flange Nuts—Right-Hand Threaded

A

B

C

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. Dia. Wd. Ht. Thick. No. of

Thread Starts Thread Type Speed

Ratio Travel Distance

per Turn Mounting Hole

Ctr.-to-Ctr. Bolt Circle

Dia. 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 6642K23 $20.05

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 6642K25 20.05

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 6642K57 20.05

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 6642K26 20.03

B 1/4"-8 1" 0.5" 1" __ __ 3/16" 8 Rounded Acme 8:1 1" __ 3/4" 9,700 50 6350K32 23.48

B 1/4"-16 1" 0.5" 1" __ __ 3/16" 4 Rounded Acme 4:1 0.25" __ 3/4" 9,700 50 6350K31 23.48

B 1/4"-20 1" 0.5" 1" __ __ 3/16" 2 Rounded Acme 2:1 0.1" __ 3/4" 9,700 50 6350K166 19.90

B 3/8"-5 1" 0.625" 1 7/64" __ __ 3/16" 5 Rounded Acme 5:1 1" __ 7/8" 9,700 75 6350K36 27.30

B 3/8"-8 1" 0.625" 1 7/64" __ __ 3/16" 4 Rounded Acme 4:1 0.5" __ 7/8" 9,700 75 6350K35 30.18

B 3/8"-10 1" 0.625" 1 7/64" __ __ 3/16" 2 Rounded Acme 2:1 0.2" __ 7/8" 9,700 75 6350K34 27.30

B 3/8"-12 1" 0.625" 1 7/64" __ __ 3/16" 3 Rounded Acme 3:1 0.25" __ 7/8" 9,700 75 6350K151 27.30

B 1/2"-8 1 1/2" 0.75" 1 1/2" __ __ 3/16" 2 Rounded Acme 2:1 0.25" __ 1 1/8" 9,700 150 6350K153 29.65

B 1/2"-8 1 1/2" 0.75" 1 1/2" __ __ 3/16" 4 Rounded Acme 4:1 0.5" __ 1 1/8" 9,700 150 6350K43 29.51

B 1/2"-8 1 1/2" 0.75" 1 1/2" __ __ 3/16" 8 Rounded Acme 8:1 1" __ 1 1/8" 9,700 150 6350K44 32.77

B 1/2"-10 1 1/2" 0.75" 1 1/2" __ __ 3/16" 2 Rounded Acme 2:1 0.2" __ 1 1/8" 9,700 150 6350K42 32.77

B 5/8"-6 1 1/2" 0.875" 1 1/2" __ __ 3/16" 12 Rounded Acme 12:1 2" __ 1 3/16" 9,700 220 6350K139 32.38

B 5/8"-8 1 1/2" 0.875" 1 1/2" __ __ 3/16" 4 Rounded Acme 4:1 0.5" __ 1 3/16" 9,700 220 6350K145 32.38

B 3/4"-8 2" 1.125" 1 3/4" __ __ 1/4" 8 Rounded Acme 8:1 1" __ 1 7/16" 9,000 350 6350K684 19.69

B 3/4"-8 2" 1.125" 1 51/64" __ __ 1/4" 2 Rounded Acme 2:1 0.25" __ 1 7/16" 9,700 350 6350K45 45.41

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 6642K33 27.75

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 6642K35 27.75

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 6642K67 27.75

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 6642K36 27.75

Acetal Plastic with Wear-Compensating Spring

B 3/4"-8 2 45/64" 1.563" 2 13/32" __ __ 5/16" 2 Rounded Acme 2:1 0.25" __ 2" 9,700 150 6350K65 163.41

C 1/4"-8 1" 0.5" 1" __ __ 3/16" 8 Rounded Acme 8:1 1" __ 3/4" 9,700 5 6350K52 37.72

C 1/4"-16 1" 0.5" 1" __ __ 3/16" 4 Rounded Acme 4:1 0.25" __ 3/4" 9,700 5 6350K51 34.13

C 1/4"-20 1" 0.5" 1" __ __ 3/16" 2 Rounded Acme 2:1 0.1" __ 3/4" 9,700 5 6350K204 34.13

C 3/8"-5 1 29/32" 0.703" 1 1/2" __ __ 3/16" 5 Rounded Acme 5:1 1" __ 1 1/8" 9,700 10 6350K56 40.75

C 3/8"-8 1 29/32" 0.703" 1 1/2" __ __ 3/16" 4 Rounded Acme 4:1 0.5" __ 1 1/8" 9,700 10 6350K55 45.04

C 3/8"-10 1 29/32" 0.703" 1 1/2" __ __ 3/16" 2 Rounded Acme 2:1 0.2" __ 1 1/8" 9,700 10 6350K54 40.75

C 3/8"-12 1 29/32" 0.703" 1 1/2" __ __ 3/16" 3 Rounded Acme 3:1 0.25" __ 1 1/8" 9,700 10 6350K188 40.75

C 1/2"-8 2" 0.891" 1 39/64" __ __ 17/64" 2 Rounded Acme 2:1 0.25" __ 1 1/4" 9,700 25 6350K191 53.23

C 1/2"-8 2" 0.891" 1 39/64" __ __ 17/64" 4 Rounded Acme 4:1 0.5" __ 1 1/4" 9,700 25 6350K63 53.23

C 1/2"-8 2" 0.891" 1 39/64" __ __ 17/64" 8 Rounded Acme 8:1 1" __ 1 1/4" 9,700 25 6350K64 53.23

C 1/2"-10 2" 0.891" 1 39/64" __ __ 17/64" 2 Rounded Acme 2:1 0.2" __ 1 1/4" 9,700 25 6350K62 53.23

C 5/8"-6 2" 1.063" 1 51/64" __ __ 17/64" 12 Rounded Acme 12:1 2" __ 1 3/8" 9,700 35 6350K177 65.73

C 5/8"-8 2" 1.063" 1 51/64" __ __ 17/64" 4 Rounded Acme 4:1 0.5" __ 1 3/8" 9,700 35 6350K183 65.73