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 Metric Precision Acme Lead Screws and Nuts, these lead screws and nuts provide increased nut life and more reliable movement in automated systems. To ensure compatibility, select components that have the same thread type, thread size, thread pitch, and number of thread starts.

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

Alloy steel lead screws are hard and strong. 303 and 304 stainless steel lead screws have good corrosion resistance.

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 Thread

Pitch, mm Lg.,

mm No. of

Thread Starts Thread Type Speed

Ratio Travel Distance

per Turn, mm Accuracy for Travel

Distance per Turn Hardness Tensile

Strength, psi Each

4140 Alloy Steel

M5 1.25 100 4 Metric Rounded Trapezoidal 4:1 5 ±0.089 mm per 300 mm Brinell 200 90,000 97783A150 $28.58

M5 1.25 175 4 Metric Rounded Trapezoidal 4:1 5 ±0.089 mm per 300 mm Brinell 200 125,000 97783A160 40.02

M8 2 200 2 Metric Rounded Trapezoidal 2:1 4 ±0.089 mm per 300 mm Brinell 200 125,000 97783A170 47.37

M8 2 300 2 Metric Rounded Trapezoidal 2:1 4 ±0.089 mm per 300 mm Brinell 200 125,000 97783A180 71.05

303 Stainless Steel

M2 0.5 50 2 Metric Rounded Trapezoidal 2:1 1 ±0.089 mm per 300 mm Brinell 160 90,000 97783A110 20.88

M2 0.5 100 2 Metric Rounded Trapezoidal 2:1 1 ±0.089 mm per 300 mm Brinell 160 90,000 97783A120 20.88

M4 1.25 75 8 Metric Rounded Trapezoidal 8:1 10 ±0.089 mm per 300 mm Brinell 160 90,000 97783A130 20.88

M4 1.25 150 8 Metric Rounded Trapezoidal 8:1 10 ±0.089 mm per 300 mm Brinell 160 90,000 97783A140 31.33

304 Stainless Steel

M8 2.5 250 4 Metric Rounded Trapezoidal 4:1 10 ±0.1 mm per 300 mm Brinell 160 72,000 2391N24 34.51

M8 2.5 500 4 Metric Rounded Trapezoidal 4:1 10 ±0.1 mm per 300 mm Brinell 160 72,000 2391N25 69.07

M10 3 250 4 Metric Rounded Trapezoidal 4:1 12 ±0.1 mm per 300 mm Brinell 160 72,000 2391N26 35.78

M10 3 500 4 Metric Rounded Trapezoidal 4:1 12 ±0.1 mm per 300 mm Brinell 160 72,000 2391N27 71.60

M12 2.5 250 2 Metric Rounded Trapezoidal 2:1 5 ±0.1 mm per 300 mm Brinell 160 72,000 2391N28 42.38

M12 2.5 500 2 Metric Rounded Trapezoidal 2:1 5 ±0.1 mm per 300 mm Brinell 160 72,000 2391N29 84.80

M12 2.5 1,000 2 Metric Rounded Trapezoidal 2:1 5 ±0.1 mm per 300 mm Brinell 160 72,000 2391N31 169.58

M16 5 250 7 Metric Rounded Trapezoidal 7:1 35 ±0.1 mm per 300 mm Brinell 160 72,000 2391N32 68.27

M16 5 500 7 Metric Rounded Trapezoidal 7:1 35 ±0.1 mm per 300 mm Brinell 160 72,000 2391N33 136.53

M16 5 1,000 7 Metric Rounded Trapezoidal 7:1 35 ±0.1 mm per 300 mm Brinell 160 72,000 2391N34 273.02

M20 5 500 4 Metric Rounded Trapezoidal 4:1 20 ±0.1 mm per 300 mm Brinell 160 72,000 2391N35 175.53

M20 5 1,000 4 Metric Rounded Trapezoidal 4:1 20 ±0.1 mm per 300 mm Brinell 160 72,000 2391N36 315.94

M20 7.5 500 8 Metric Rounded Trapezoidal 8:1 60 ±0.1 mm per 300 mm Brinell 160 72,000 2391N37 179.24

M20 7.5 1,000 8 Metric Rounded Trapezoidal 8:1 60 ±0.1 mm per 300 mm Brinell 160 72,000 2391N38 322.64

Round Nuts—Right-Hand Threaded

A

  Thread

Size Thread

Pitch, mm Lg. Dia. No. of

Thread Starts Thread Type Speed

Ratio Travel Distance

per Turn, mm Hardness Tensile

Strength, psi Dynamic Thrust

Load Cap. Temperature

Range, °F Each

Acetal Plastic

A M8 2.5 15/32" 0.709" 4 Metric Rounded Trapezoidal 4:1 10 Durometer 74D 10,000 Not Rated -40° to 185° 2391N17 $54.71

A M10 3 25/32" 0.866" 4 Metric Rounded Trapezoidal 4:1 12 Durometer 74D 10,000 Not Rated -40° to 185° 2391N18 56.00

A M12 2.5 15/16" 1.024" 2 Metric Rounded Trapezoidal 2:1 5 Durometer 74D 10,000 Not Rated -40° to 185° 2391N19 66.14

A M16 5 1 17/64" 1.417" 7 Metric Rounded Trapezoidal 7:1 35 Durometer 74D 10,000 Not Rated -40° to 185° 2391N21 64.62

A M20 5 1 37/64" 1.772" 4 Metric Rounded Trapezoidal 4:1 20 Durometer 74D 10,000 Not Rated -40° to 185° 2391N22 86.98

A M20 7.5 1 37/64" 1.772" 8 Metric Rounded Trapezoidal 8:1 60 Durometer 74D 10,000 Not Rated -40° to 185° 2391N23 86.98

Externally Threaded Nuts—Right-Hand Threaded

B

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

B M2 0.5 11/16" 0.297" 7/16" 2 Metric Rounded Trapezoidal 2:1 1 3/8"-24 3/16" 8,000 10 -40° to 185° 97783A190 $24.57

B M4 1.25 11/16" 0.297" 7/16" 8 Metric Rounded Trapezoidal 8:1 10 3/8"-24 3/16" 8,000 25 -40° to 185° 97783A210 24.57

B M5 1.25 11/16" 0.297" 7/16" 4 Metric Rounded Trapezoidal 4:1 5 3/8"-24 3/16" 8,000 25 -40° to 185° 97783A220 24.57

B M8 2 1" 0.548" 11/16" 2 Metric Rounded Trapezoidal 2:1 4 5/8"-18 1/4" 8,000 75 -40° to 185° 97783A230 30.24

Flange Nuts—Right-Hand Threaded

C

D

E

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. Temp.

Range, °F Each

Acetal Plastic

C M2 0.5 1/2" 0.297" __ 3/4" 13/32" 1/8" 2 Metric Rounded Trapezoidal 2:1 1 39/64" __ 8,000 10 -40° to 185° 97783A240 $24.57

C M4 1.25 1/2" 0.297" __ 3/4" 13/32" 1/8" 8 Metric Rounded Trapezoidal 8:1 10 39/64" __ 8,000 25 -40° to 185° 97783A250 24.57

C M5 1.25 1/2" 0.297" __ 3/4" 13/32" 1/8" 4 Metric Rounded Trapezoidal 4:1 5 39/64" __ 8,000 25 -40° to 185° 97783A260 24.57

D M8 2 3/4" 0.548" 1 1/8" __ __ 3/16" 2 Metric Rounded Trapezoidal 2:1 4 __ 7/8" 8,000 75 -40° to 185° 97783A270 30.24

E M8 2.5 25/32" 0.787" 1 27/64" __ __ 5/16" 4 Metric Rounded Trapezoidal 4:1 10 __ 1 7/64" 10,000 Not Rated -40° to 185° 2391N11 72.16

E M10 3 63/64" 0.984" 1 21/32" __ __ 25/64" 4 Metric Rounded Trapezoidal 4:1 12 __ 1 11/32" 10,000 Not Rated -40° to 185° 2391N12 75.53

E M12 2.5 1 3/8" 1.102" 1 57/64" __ __ 15/32" 2 Metric Rounded Trapezoidal 2:1 5 __ 1 1/2" 10,000 Not Rated -40° to 185° 2391N13 87.58

E M16click to learn more about M16 5 1 3/8" 1.102" 1 57/64" __ __ 15/32" 7 Metric Rounded Trapezoidalclick to learn more about Metric Rounded Trapezoidal 7:1 35 __ 1 1/2" 10,000 Not Rated -40° to 185° 2391N14 93.02

E M20 5 1 47/64" 1.26" 2 11/64" __ __ 15/32" 4 Metric Rounded Trapezoidal 4:1 20 __ 1 49/64" 10,000 Not Rated -40° to 185° 2391N15 120.69

E M20 7.5 1 47/64" 1.26" 2 11/64" __ __ 15/32" 8 Metric Rounded Trapezoidal 8:1 60 __ 1 49/64" 10,000 Not Rated -40° to 185° 2391N16 120.67