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.

Alloy steel lead screws are hard and strong. 303 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

M8 1.5 100 1 Metric Rounded Trapezoidal 1:1 1.5 ±0.089 mm per 300 mm Brinell 200 125,000 7549K55 $23.68

M8 1.5 200 1 Metric Rounded Trapezoidal 1:1 1.5 ±0.089 mm per 300 mm Brinell 200 125,000 7549K56 47.37

M8 1.5 300 1 Metric Rounded Trapezoidal 1:1 1.5 ±0.089 mm per 300 mm Brinell 200 125,000 7549K57 71.05

303 Stainless Steel

M2 0.5 50 1 Metric Rounded Trapezoidal 1:1 0.5 ±0.089 mm per 300 mm Brinell 160 90,000 7549K51 20.88

M2 0.5 100 1 Metric Rounded Trapezoidal 1:1 0.5 ±0.089 mm per 300 mm Brinell 160 90,000 7549K52 20.88

M4 0.3 75 1 Metric Rounded Trapezoidal 1:1 0.3 ±0.089 mm per 300 mm Brinell 160 90,000 7549K53 20.88

M4 0.3 150 1 Metric Rounded Trapezoidal 1:1 0.3 ±0.089 mm per 300 mm Brinell 160 90,000 7549K54 31.33

Externally Threaded Nuts—Right-Hand Threaded

A

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° 7549K58 $24.57

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° 7549K59 24.57

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° 7549K61 30.24

Flange Nuts—Right-Hand Threaded

B

C

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° 7549K62 $24.57

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° 7549K63 24.57

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° 7549K64 30.24