Materials used in Helix acme nuts have been selected for low friction, minimum wear, long life, and clean operation.
Special high tensile bronze is selected for our smooth running, anti-wedging bronze nuts.
Nut specifications can be found in the Quick References on pages 18-19 and 60 of our Acme Screw Catalog. Flange and nut dimensions are listed with the appropriate screw data.
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.
Made from carbon steel with black oxided finish. See page 11 for Mounting and Pinning Acme Nut flange installation instructions.
|SCREW TYPE||MATERIAL||THREAD CLASS||LEAD ACCURACY||SCREW DIA.||SCREW LENGTHS|
|Centralizing 2C or Stub||±.0003"/" up to 21⁄2" dia.||1⁄4" to 6"||Limited only by material availability|
|Stainless||Centralizing 2C or Stub||±.0003"/" up to 11⁄2" dia.||1⁄4" to 11⁄2"||Limited only by material availability|
|Milled||Alloy||Centralizing 2C or 3C||±.002"/ft||1⁄2" to 3" (single starts)||up to 96"|
|Stainless||Centralizing 2C or 3C||±.002"/ft||1⁄2" to 3" (single starts)||up to 96"|
|Ground||Alloy||Centralizing 3C or 4C||±.0005"/ft||1⁄4" to 4"||up to 120"|
|Stainless||Centralizing 2C or 3C||±.0005"/ft||1⁄4" to 4"||up to 120"|
|ACME & TRAPEZODIAL||STAINLESS STEEL|
|Screw Material||4140||300 Series|
|Minimum Hardness||200 Brinnel||170 Brinnel|
|Tensile Ultimate Strength||95,000 psi||85,000 psi|