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Acme Screw

Nook manufactures precision acme screws and lead screws by thread rolling, thread milling, or thread grinding processes. Each process produces high precision screws with centralized thread forms for smooth, no-wedging performance. Rolled Thread Acme Screws are stocked for quick delivery.

Acme Screw Literature

Acme Screw Advantages

  • Preloaded nut assembly eliminates backlash
  • Safe to operate under static load to hold
  • Self-locking - no need for brakes (even in power outage)
  • Low noise (no rolling components)
  • Ideal for vertical and light/moderate loads
  • Eliminates backlash
  • Lower cost solution

Engineering Resources

Acme Screw Engineering Calculators, Engineering Tools, & Technical Information. A comprehensive library of helpful acme screw resources.

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Largest Selection of Rolled Acme Screws

  • ACME SCREW (ROLLED): Cost effective and stocked for quick delivery.
  • ACME SCREW (MILLED): Allow more variety in journal machining, particularly when the journal O.D. to be larger than the screw major diameter.
  • ACME SCREW (GROUND): Offer higher lead accuracy for applications where positioning tolerances are extremely critical.
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Acme Screw - Inch Precision

 

Type Material Thread Class Lead Accuracy Screw Diameter Screw Lengths

Rolled

 

 

Alloy
Stainless

 

 

Centralizing 2C/Stub
Centralizing 2C/Stub

 

 

± 0.004 in/ft*
± 0.004 in/ft* 

Up to 1.5" dia.

 

0.75 to 6.00"
0.75 to 1.50"

 

 

Not Limited 
Not Limited

 

 

Milled

 

Alloy
Stainless

 

Centralizing 2C/3C
Centralizing 2C/3C

 

± 0.002 in/ft
± 0.002 in/ft

 

0.75 to 3.00" 
0.75 to 3.00"

 

Up to 96"
Up to 96"

 

Ground Alloy
Stainless
Centralizing 3C/4C
Centralizing 2C/3C
± 0.0005 in/ft
± 0.0005 in/ft
0.75 to 4.00"
0.75 to 4.00"
Up to 120"
Up to 120"

  

Acme Screw and Nut Assemblies

Provide turn-key solutions that only require a power source (hand operation or motor). All of the elements are available for quick delivery from shelf stock. Part Number Reference 

Twin-lead acme screws offer dual opposing motion using a single drive system. These one-piece high performance acme screws are made from high alloy steel coated with black oxide for protection and can be assembled with Nook PowerAc™ acme nuts, flanges, and EZZE-MOUNT™ bearing supports to form cost effective systems. 

Acme Nut - Inch Precision

Acme Nut - Inch Precision

BRONZE ACME NUT

  • Tensile Yield: 50,000 psi
  • Tensile Ultimate: 65,000 psi
  • Hardness: HB75
  • Dynamic co-efficient of friction: 0.125 with Nook Lubricant

PLASTIC ACME NUT

  • Tensile Strength @70°F: 8,000 psi
  • Compressive Strength @70°F: 16,000 psi
  • PV Limit: 2,700 lubricated
  • Co-efficient of friction: 0.10 lubricated

Acme Screw - Metric Precision

Trapezoidal Acme Screw and Nut

Similar in construction and materials to PowerAc™ Inch Acme Screws and Nuts, the Trapezoidal thread form has been enhanced to include a centralizing thread form to prevent wedging and binding. See the PowerAc™ technical data on pages 54-59 for additional screw and nut details.

  • Standard lead accuracy: ±6.25μm / 25mm
  • Temperature Range: Plastic Nuts: -9° to +79° C
    Bronze Nuts: -9° to +177° C

Trapezoidal Lead Nut

Trapezoidal Lead Nut

BRONZE ACME NUT

  • Tensile Yield: 50,000 psi
  • Tensile Ultimate: 65,000 psi
  • Hardness: HB75
  • Dynamic co-efficient of friction: 0.125 with Nook Lubricant

PLASTIC ACME NUT

  • Tensile Strength @70°F: 8,000 psi
  • Compressive Strength @70°F: 16,000 psi
  • PV Limit: 2,700 lubricated
  • Co-efficient of friction: 0.10 lubricated