How to Compare Acme Nuts and Acme Nut Material

Christopher Nook by Christopher Nook

Not sure which material to use for your acme nuts? Learn the basics of the materials used in acme nuts and how to compare them with our helpful PowerPoint that we have created for you. Please note that all Helix materials used have been selected for low friction, minimum wear, long life and clean operation.

Not sure which material to use for your acme nuts?

Learn the basics of the materials used in acme nuts and how to compare them with our helpful PowerPoint that we have created for you. Please note that all Helix materials used have been selected for low friction, minimum wear, long life and clean operation. 

Comparing Nut Materials PowerPoint

 

1.   Bronze Acme and Trapezoidal Nut:

Special high tensile bronze is selected for smooth running, anti-wedging bronze nuts.

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

 

2.   Plastic Acme and Trapezoidal Nut:

The high strength and inherent lubricity of plastic acme and trapezoidal nut material can result in product life that can equal or exceed conventional nut materials.

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

 

3.   PowerAc™ Flanges for Bronze and Plastic Nuts:

Made from carbon steel with black oxided finish. 

  ACME & TRAPEZODIAL STAINLESS STEEL
Screw Material 4140 300 Series
Minimum Hardness 200 brinnel 170 Brinnel
Tensile Ultimate Strength 95,000 psi 85,000 psi
Finish Black Oxide Natural

 

SCREW TYPE MATERIAL THREAD CLASS LEAD ACCURACY SCREW DIA. SCREW LENGTHS
Rolled Alloy Centralizing 2C or Stub ±.0003"/" up to 212" dia.  14" to 6"  Limited only by material availability
   Stainless  Centralizing 2C or Stub  ±.0003"/" up to 112" dia.  14" to 112"  Limited only by material availability
 Milled  Alloy  Centralizing 2C or 3C  ±.002"/ft  12" to 3" (single starts)  up 10 96"
   Stainless  Centralizing 2C or 3C  ±.002"/ft  12" to 3" (single starts)  up to 96"
 Ground  Alloy  Centralizing 3C or 4C  ±.0005"/ft  14" to 4"  up to 120"
   Stainless  Centralizing 2C or 3C  ±.0005"/ft 14" to 4"   up to 120"

Comparing and Contrasting Helix Acme Nut Material Options:

The next step in determining which of these acme nut materials you would like to use for your product, would be to compare each material based on 3 important measures:

  1. Wear Factor

  2. Coefficient of Friction

  3. Tensile Strength

 

 

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Resources

Lead Screw Nut and Acme Screw Nut Material Reference Guide