Materials, Coatings & Platings

Heli-Coil screw thread inserts are available in a wide choice of materials to suit specific application needs: 

Materials

  • 304 Stainless Steel

  • Standard, general-purpose material
  • Ideal for original equipment applications, repair, and overhaul
  • Stocked in most sizes

  • Inconel X750

  • Used in areas exposed to high temperatures
  • Typical uses: gas turbine engines, nuclear applications, well drilling
  • Non-magnetic

  • Phosphor Bronze

  • Ideal for salt water applications
  • Non-magnetic
  • Excellent electrical conductivity

  • Nitronic 60®

  • Superb gall resistance
  • Compatible with stainless steel screws
  • Ideal for use in vacuum environments
  • Requires no additional coatings or plating
  • Particle-free
  • Non-magnetic

  • Titanium

  • Superior strength-to-weight ratio
  • Corrosion-resistant
  • Excellent low-temperature stability

Coatings & Platings

  • Dry Film Lubricant

  • Provides additional lubrication in high-friction applications
  • High temperature resistance (400°F)
  • Highly recommended with Heli-Coil screw-locking inserts
  • Mildly corrosive
  • Material Spec: AS5272
  • Color: Gray

  • Primer Free® II

  • RoHS-compliant; contains no chromates
  • Eliminates need for zinc primers and epoxies
  • Provides uniform top-to-bottom coverage
  • Prevents galvanic corrosion between insert and parent material
  • Eliminates locking torque issues associated with primers
  • Improves installation productivity
  • Provides additional lubrication facilitating insert installation
  • Material Spec: None
  • Color: Matte Black

  • Cadmium

  • For military specification purposes only
  • Not recommended for new design due to its toxic nature
  • Cadmium Plating Material Spec: QQ-P-416 Type II
  • Color: Iridescent Yellow (free-running)
  • Color: Olive Drab (screw-locking)

  • Silver Plating

  • Recommended to reduce galling of threads at high temperatures
  • For use up to 1200°F
  • Highly recommended with inserts made from Inconel X750
  • Material Spec: QQ-S-365
  • Color: Silver White

  • Color Coding

  • Facilitates verification of insert installation
  • Allows for quick identification of similar-size inserts
  • Available in Blue, Green, Red, and Black